Repository: hzcforever/nowcoder-project Branch: master Commit: aaf6d36983d7 Files: 250 Total size: 5.7 MB Directory structure: gitextract_xieu8nyq/ ├── README.md ├── wenda/ │ ├── .idea/ │ │ ├── compiler.xml │ │ ├── encodings.xml │ │ ├── inspectionProfiles/ │ │ │ └── Project_Default.xml │ │ ├── libraries/ │ │ │ ├── Maven__antlr_antlr_2_7_7.xml │ │ │ ├── Maven__aopalliance_aopalliance_1_0.xml │ │ │ ├── Maven__ch_qos_logback_logback_classic_1_1_7.xml │ │ │ ├── Maven__ch_qos_logback_logback_core_1_1_7.xml │ │ │ ├── Maven__com_alibaba_fastjson_1_2_13.xml │ │ │ ├── Maven__com_fasterxml_classmate_1_1_0.xml │ │ │ ├── Maven__com_fasterxml_jackson_core_jackson_annotations_2_6_7.xml │ │ │ ├── Maven__com_fasterxml_jackson_core_jackson_core_2_6_7.xml │ │ │ ├── Maven__com_fasterxml_jackson_core_jackson_databind_2_6_7.xml │ │ │ ├── Maven__com_google_protobuf_protobuf_java_2_6_0.xml │ │ │ ├── Maven__commons_beanutils_commons_beanutils_1_9_2.xml │ │ │ ├── Maven__commons_chain_commons_chain_1_1.xml │ │ │ ├── Maven__commons_collections_commons_collections_3_2_2.xml │ │ │ ├── Maven__commons_digester_commons_digester_2_1.xml │ │ │ ├── Maven__commons_lang_commons_lang_2_4.xml │ │ │ ├── Maven__commons_validator_commons_validator_1_3_1.xml │ │ │ ├── Maven__dom4j_dom4j_1_1.xml │ │ │ ├── Maven__javax_activation_activation_1_1.xml │ │ │ ├── Maven__javax_mail_mail_1_4_7.xml │ │ │ ├── Maven__javax_validation_validation_api_1_1_0_Final.xml │ │ │ ├── Maven__junit_junit_4_12.xml │ │ │ ├── Maven__mysql_mysql_connector_java_8_0_12.xml │ │ │ ├── Maven__org_apache_commons_commons_pool2_2_4_2.xml │ │ │ ├── Maven__org_apache_struts_struts_core_1_3_8.xml │ │ │ ├── Maven__org_apache_struts_struts_taglib_1_3_8.xml │ │ │ ├── Maven__org_apache_struts_struts_tiles_1_3_8.xml │ │ │ ├── Maven__org_apache_tomcat_embed_tomcat_embed_core_8_0_36.xml │ │ │ ├── Maven__org_apache_tomcat_embed_tomcat_embed_el_8_0_36.xml │ │ │ ├── Maven__org_apache_tomcat_embed_tomcat_embed_logging_juli_8_0_36.xml │ │ │ ├── Maven__org_apache_tomcat_embed_tomcat_embed_websocket_8_0_36.xml │ │ │ ├── Maven__org_apache_tomcat_tomcat_jdbc_8_0_36.xml │ │ │ ├── Maven__org_apache_tomcat_tomcat_juli_8_0_36.xml │ │ │ ├── Maven__org_apache_velocity_velocity_1_7.xml │ │ │ ├── Maven__org_apache_velocity_velocity_tools_2_0.xml │ │ │ ├── Maven__org_aspectj_aspectjweaver_1_8_9.xml │ │ │ ├── Maven__org_hamcrest_hamcrest_core_1_3.xml │ │ │ ├── Maven__org_hamcrest_hamcrest_library_1_3.xml │ │ │ ├── Maven__org_hibernate_hibernate_validator_5_2_4_Final.xml │ │ │ ├── Maven__org_jboss_logging_jboss_logging_3_3_0_Final.xml │ │ │ ├── Maven__org_mockito_mockito_core_1_10_19.xml │ │ │ ├── Maven__org_mybatis_mybatis_3_4_0.xml │ │ │ ├── Maven__org_mybatis_mybatis_spring_1_3_0.xml │ │ │ ├── Maven__org_mybatis_spring_boot_mybatis_spring_boot_autoconfigure_1_1_1.xml │ │ │ ├── Maven__org_mybatis_spring_boot_mybatis_spring_boot_starter_1_1_1.xml │ │ │ ├── Maven__org_objenesis_objenesis_2_1.xml │ │ │ ├── Maven__org_slf4j_jcl_over_slf4j_1_7_21.xml │ │ │ ├── Maven__org_slf4j_jul_to_slf4j_1_7_21.xml │ │ │ ├── Maven__org_slf4j_log4j_over_slf4j_1_7_21.xml │ │ │ ├── Maven__org_slf4j_slf4j_api_1_7_21.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_autoconfigure_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_devtools_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_aop_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_jdbc_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_logging_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_test_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_tomcat_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_validation_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_velocity_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_boot_spring_boot_starter_web_1_3_6_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_aop_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_beans_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_context_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_context_support_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_core_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_expression_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_jdbc_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_test_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_tx_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_web_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_springframework_spring_webmvc_4_2_7_RELEASE.xml │ │ │ ├── Maven__org_yaml_snakeyaml_1_16.xml │ │ │ ├── Maven__oro_oro_2_0_8.xml │ │ │ ├── Maven__redis_clients_jedis_2_9_0.xml │ │ │ └── Maven__sslext_sslext_1_2_0.xml │ │ ├── misc.xml │ │ ├── modules.xml │ │ └── workspace.xml │ ├── .mvn/ │ │ └── wrapper/ │ │ ├── maven-wrapper.jar │ │ └── maven-wrapper.properties │ ├── mvnw │ ├── mvnw.cmd │ ├── pom.xml │ ├── pyspider/ │ │ ├── conf.json │ │ └── data/ │ │ ├── scheduler.1d │ │ ├── scheduler.1h │ │ └── scheduler.all │ ├── src/ │ │ ├── main/ │ │ │ ├── java/ │ │ │ │ └── com/ │ │ │ │ └── nowcoder/ │ │ │ │ ├── WendaApplication.java │ │ │ │ ├── aspect/ │ │ │ │ │ └── LogAspect.java │ │ │ │ ├── async/ │ │ │ │ │ ├── EventConsumer.java │ │ │ │ │ ├── EventHandler.java │ │ │ │ │ ├── EventModel.java │ │ │ │ │ ├── EventProducer.java │ │ │ │ │ ├── EventType.java │ │ │ │ │ └── handler/ │ │ │ │ │ ├── FeedHandler.java │ │ │ │ │ ├── FollowHandler.java │ │ │ │ │ ├── LikeHandler.java │ │ │ │ │ └── LoginExceptionHandler.java │ │ │ │ ├── configuration/ │ │ │ │ │ └── WendaWebConfiguration.java │ │ │ │ ├── controller/ │ │ │ │ │ ├── CommentController.java │ │ │ │ │ ├── FeedController.java │ │ │ │ │ ├── FollowController.java │ │ │ │ │ ├── HomeController.java │ │ │ │ │ ├── IndexController.java │ │ │ │ │ ├── LikeController.java │ │ │ │ │ ├── LoginController.java │ │ │ │ │ ├── MessageController.java │ │ │ │ │ ├── QuestionController.java │ │ │ │ │ └── SettingController.java │ │ │ │ ├── dao/ │ │ │ │ │ ├── CommentDAO.java │ │ │ │ │ ├── FeedDAO.java │ │ │ │ │ ├── LoginTicketDAO.java │ │ │ │ │ ├── MessageDAO.java │ │ │ │ │ ├── QuestionDAO.java │ │ │ │ │ └── UserDAO.java │ │ │ │ ├── interceptor/ │ │ │ │ │ ├── LoginRequredInterceptor.java │ │ │ │ │ └── PassportInterceptor.java │ │ │ │ ├── model/ │ │ │ │ │ ├── Comment.java │ │ │ │ │ ├── EntityType.java │ │ │ │ │ ├── Feed.java │ │ │ │ │ ├── HostHolder.java │ │ │ │ │ ├── LoginTicket.java │ │ │ │ │ ├── Message.java │ │ │ │ │ ├── Question.java │ │ │ │ │ ├── User.java │ │ │ │ │ └── ViewObject.java │ │ │ │ ├── service/ │ │ │ │ │ ├── CommentService.java │ │ │ │ │ ├── FeedService.java │ │ │ │ │ ├── FollowService.java │ │ │ │ │ ├── LikeService.java │ │ │ │ │ ├── LoginTicketService.java │ │ │ │ │ ├── MessageService.java │ │ │ │ │ ├── QuestionService.java │ │ │ │ │ ├── SensitiveService.java │ │ │ │ │ ├── UserService.java │ │ │ │ │ └── WendaService.java │ │ │ │ └── util/ │ │ │ │ ├── JedisAdapter.java │ │ │ │ ├── MailSender.java │ │ │ │ ├── RedisKeyUtil.java │ │ │ │ └── WendaUtil.java │ │ │ └── resources/ │ │ │ ├── SensitiveWords.txt │ │ │ ├── application.properties │ │ │ ├── com/ │ │ │ │ └── nowcoder/ │ │ │ │ └── dao/ │ │ │ │ ├── FeedDAO.xml │ │ │ │ └── QuestionDAO.xml │ │ │ ├── mybatis-config.xml │ │ │ ├── static/ │ │ │ │ ├── scripts/ │ │ │ │ │ ├── base.fb262f0e.js │ │ │ │ │ ├── common.fed5411f.js │ │ │ │ │ ├── ga.js │ │ │ │ │ ├── instant.e7a17de6.js │ │ │ │ │ ├── main/ │ │ │ │ │ │ ├── base/ │ │ │ │ │ │ │ ├── base.js │ │ │ │ │ │ │ ├── event.js │ │ │ │ │ │ │ └── util.js │ │ │ │ │ │ ├── component/ │ │ │ │ │ │ │ ├── component.js │ │ │ │ │ │ │ ├── popup.js │ │ │ │ │ │ │ ├── popupAdd.js │ │ │ │ │ │ │ └── popupMsg.js │ │ │ │ │ │ ├── jquery.js │ │ │ │ │ │ ├── site/ │ │ │ │ │ │ │ ├── detail.js │ │ │ │ │ │ │ ├── follow.js │ │ │ │ │ │ │ ├── home.js │ │ │ │ │ │ │ └── profile.js │ │ │ │ │ │ └── util/ │ │ │ │ │ │ ├── action.js │ │ │ │ │ │ └── business.js │ │ │ │ │ ├── page-index.d7b54ac7.js │ │ │ │ │ ├── page-main.5d4c554d.js │ │ │ │ │ ├── richtexteditor.aa0a4005.js │ │ │ │ │ └── vendor.ff76fbae.js │ │ │ │ └── styles/ │ │ │ │ ├── detail.css │ │ │ │ ├── index.css │ │ │ │ ├── letter.css │ │ │ │ ├── login.css │ │ │ │ └── result.css │ │ │ ├── templates/ │ │ │ │ ├── detail.html │ │ │ │ ├── error.html │ │ │ │ ├── feeds.html │ │ │ │ ├── followees.html │ │ │ │ ├── followers.html │ │ │ │ ├── footer.html │ │ │ │ ├── header.html │ │ │ │ ├── home.html │ │ │ │ ├── index.html │ │ │ │ ├── js.html │ │ │ │ ├── letter.html │ │ │ │ ├── letterDetail.html │ │ │ │ ├── login.html │ │ │ │ ├── mails/ │ │ │ │ │ └── login_exception.html │ │ │ │ ├── profile.html │ │ │ │ └── result.html │ │ │ └── toolbox.xml │ │ └── test/ │ │ ├── java/ │ │ │ └── com/ │ │ │ └── nowcoder/ │ │ │ ├── InitDatabaseTests.java │ │ │ ├── ThreadTest.java │ │ │ └── WendaApplicationTests.java │ │ └── resources/ │ │ └── init-schema.sql │ ├── target/ │ │ ├── classes/ │ │ │ ├── SensitiveWords.txt │ │ │ ├── application.properties │ │ │ ├── com/ │ │ │ │ └── nowcoder/ │ │ │ │ └── dao/ │ │ │ │ ├── FeedDAO.xml │ │ │ │ └── QuestionDAO.xml │ │ │ ├── mybatis-config.xml │ │ │ ├── static/ │ │ │ │ ├── scripts/ │ │ │ │ │ ├── base.fb262f0e.js │ │ │ │ │ ├── common.fed5411f.js │ │ │ │ │ ├── ga.js │ │ │ │ │ ├── instant.e7a17de6.js │ │ │ │ │ ├── main/ │ │ │ │ │ │ ├── base/ │ │ │ │ │ │ │ ├── base.js │ │ │ │ │ │ │ ├── event.js │ │ │ │ │ │ │ └── util.js │ │ │ │ │ │ ├── component/ │ │ │ │ │ │ │ ├── component.js │ │ │ │ │ │ │ ├── popup.js │ │ │ │ │ │ │ ├── popupAdd.js │ │ │ │ │ │ │ └── popupMsg.js │ │ │ │ │ │ ├── jquery.js │ │ │ │ │ │ ├── site/ │ │ │ │ │ │ │ ├── detail.js │ │ │ │ │ │ │ ├── follow.js │ │ │ │ │ │ │ ├── home.js │ │ │ │ │ │ │ └── profile.js │ │ │ │ │ │ └── util/ │ │ │ │ │ │ ├── action.js │ │ │ │ │ │ └── business.js │ │ │ │ │ ├── page-index.d7b54ac7.js │ │ │ │ │ ├── page-main.5d4c554d.js │ │ │ │ │ ├── richtexteditor.aa0a4005.js │ │ │ │ │ └── vendor.ff76fbae.js │ │ │ │ └── styles/ │ │ │ │ ├── detail.css │ │ │ │ ├── index.css │ │ │ │ ├── letter.css │ │ │ │ ├── login.css │ │ │ │ └── result.css │ │ │ ├── templates/ │ │ │ │ ├── detail.html │ │ │ │ ├── error.html │ │ │ │ ├── feeds.html │ │ │ │ ├── followees.html │ │ │ │ ├── followers.html │ │ │ │ ├── footer.html │ │ │ │ ├── header.html │ │ │ │ ├── home.html │ │ │ │ ├── index.html │ │ │ │ ├── js.html │ │ │ │ ├── letter.html │ │ │ │ ├── letterDetail.html │ │ │ │ ├── login.html │ │ │ │ ├── mails/ │ │ │ │ │ └── login_exception.html │ │ │ │ ├── profile.html │ │ │ │ └── result.html │ │ │ └── toolbox.xml │ │ └── test-classes/ │ │ └── init-schema.sql │ └── wenda.iml └── wenda.sql ================================================ FILE CONTENTS ================================================ ================================================ FILE: README.md ================================================ # nowcoder问答平台 **本项目是一个基于 SpringBoot 的问答平台。数据库使用了 redis 和 mysql，实现注册登录、点赞点踩、评论站内信、Timeline 事件流等功能，同时通过一个异步消息框架来实现事件的异步处理，并使用爬虫对网站进行数据填充。** ## 目录 - [项目的基本框架及配置](#项目的基本框架及配置) - [AOP 和 IOC](#AOP-和-IOC) - [MySQL 和 MyBatis](#MySQL-和-MyBatis) - [注册与登录的实现](#注册与登录的实现) - [发表问题和敏感词过滤](#发表问题和敏感词过滤) - [发表评论和站内信](#发表评论和站内信) - [Redis 实现点赞和点踩功能](#Redis-实现点赞和点踩功能) - [异步消息机制](#异步消息机制) - [关注和粉丝列表的实现](#关注和粉丝列表的实现) - [推拉模式下的 Feed 流](#推拉模式下的-Feed-流) - [使用爬虫对网站进行数据填充](#使用爬虫对网站进行数据填充) - [将项目部署到 Linux 虚拟机](#将项目部署到-Linux-虚拟机) - [功能扩展](#功能扩展) ## 项目的基本框架及配置 ## 创建 git 仓库，本地配置 IDEA 并测试 pull 和 push。 创建 SpringBoot 工程，导入 web，velocity 和 aop 的包。 生成 maven 项目，pom.xml 包含上述依赖。 Controller 中使用注解配置，requestmapping，responsebody 基本可以解决请求转发以及响应内容的渲染。responsebody 自动选择 viewresolver 进行解析。 使用 pathvariable 和 requestparam 传递参数，使用 velocity 编写页面模板，注意其中的语法使用。常用 $!{} 和 ${}。 使用 HTTP 规范下的 httpservletrequest 和 httpservletresponse 来封装请求和相响应，使用封装好的 session 和 cookie 对象。 使用重定向的 redirectview 和统一异常处理器 exceptionhandler。 ## AOP 和 IOC ## IOC 解决对象实例化以及依赖传递问题，解耦。 AOP 解决纵向切面问题，主要实现日志和权限控制功能。 Aspect 实现切面，并且使用 logger 来记录日志，用该切面的切面方法来监听 Controller。 有关 Spring 框架中 IOC 容器和 AOP 动态代理的相关知识可参见 [simple-spring](https://github.com/hzcforever/simple-spring)。 ## MySQL 和 MyBatis ## 使用 MySQL 创建数据库和表。 加入 MyBatis和 MySQL 的 maven 仓库，注意，由于现在版本的 SpringBoot 不再支持 velocity 进而导致我使用较早版本的 SpringBoot，所以这里提供一可以正常运行的版本设置。 SpringBoot 使用1.4.0，mybatis-spring-boot-starter 使用1.2.1，mysql-connector-java 使用8.0.12。 注意 MyBatis 的注解语法以及 xml 的配置要求，xml 要求放在 resource 中并且与 DAO 接口在相同的包路径下。 application.properties 增加 Spring 配置数据库链接地址。 两个小工具： - ViewObject:方便传递任何数据到 - VelocityDateTool:velocity 自带工具类 写好静态文件 html、css 和 js，并且注意配置。 - spring.velocity.suffix=.html 保证跳转请求转发到 html 上 - spring.velocity.toolbox-config-location=toolbox.xml ## 注册与登录的实现 ## 新建数据表 login_ticket 用来存储 ticket 字段。该字段在用户登录成功时被生成并存入数据库，并被设置为 Cookie，下次用户登录时会带上这个 ticket，ticket 是随机的 UUID 字符串，有过期时间以及有效状态。 使用拦截器 interceptor 来拦截所有用户请求，判断请求中是否存在有效的 ticket，如果有就将用户信息写入 Threadlocal。所有线程的 threadlocal 都被存在一个叫做 hostholder 的实例中，根据该实例就可以在全局任意位置获取用户的信息。 该 ticket 的功能类似 Session，也是通过 Cookie 写回浏览器，浏览器请求时再通过 Cookie 传递，区别是该字段是存在数据库中的，并且可以用于移动端。 通过用户访问权限拦截器来拦截用户的越界访问，比如用户没有管理员权限就不能访问管理员页面。 数据安全性的保障手段：HTTPS 使用公钥加密私钥解密，比如支付宝的密码加密，单点登录验证，验证码机制等。 ## 发表问题和敏感词过滤 ## 发布问题时检查标题和内容，防止 xss 注入，并且过滤敏感词。 防止 xss 注入直接使用 HTMLutils 的方法即可实现。 过滤敏感词首先需要建立一个字典树，并且读取一份保存敏感词的文本文件，然后初始化字典树。最后将过滤器作为一个服务，让需要过滤敏感词的服务进行调用即可。 ## 发表评论和站内信 ## 首先建立表 comment 和 message 分别代表评论和站内信。 评论的逻辑是每一个问题下面都有评论，显示评论数量，具体内容，评论人等信息。 消息的逻辑是，两个用户之间发送一条消息，有一个唯一的会话 id，这个会话里可以有多条这两个用户的交互信息。通过一个用户 id 获取该用户的会话列表，再根据会话 id 再获取具体的会话内的多条消息。 逻辑清楚之后，再加上一些附加功能，比如显示未读消息数量，根据时间顺序排列会话和消息。 本节内容基本就是业务逻辑的开发，没有新增什么技术点，主要是前后端交互的逻辑比较复杂，前端的开发量也比较大。 ## Redis 实现点赞和点踩功能 ## 首先了解一下 Redis 的基础知识，数据结构，Jedis 使用等。 编写list，string，hashmap，set，sortset的测试用例，熟悉 Jedis API。 开发点踩和点赞功能，在此之前根据业务封装好 Jedis 的增删改查操作，放在 util 包中。 根据需求确定 key 字段，格式是——like：实体类型：实体id 和 dislike：实体类型：实体 id。这样可以将喜欢一条新闻的人存在一个集合，不喜欢的存在另一个集合。通过统计数量可以获得点赞和点踩数。 一般点赞点踩操作是先修改 Redis 的值并获取返回值，然后再异步修改 MySQL 数据库的 likecount 数值。这样既可以保证点赞操作快速完成，也可保证数据一致性。 ## 异步消息机制 ## 在之前的功能中有一些不需要实时执行的操作或者任务，我们可以把它们改造成异步消息来进行发送。 具体操作就是使用 Redis 来实现异步消息队列。代码中使用事件 Event 来包装一个事件，事件需要记录事件实体的各种信息：一个异步工具类（事件生产者 + 事件消费者 + EventHandler 接口），让以后各种事件的实现类来实现这个接口。 事件生产者一般作为一个服务，由 Controller 中的业务逻辑调用并产生一个事件，将事件序列化存入 Redis 队列中，事件消费者则通过一个线程循环获取队列里的事件，并且寻找对应的 handler 进行处理。 整个异步事件的框架开发完成，后面新加入的登录，点赞等事件都可以这么实现。 ## 关注和粉丝列表的实现 ## 新增关注功能，使用 Redis 实现每一个关注对象的粉丝列表以及每一个用户的关注对象列表。通过该列表的 crud 操作可以对应获取粉丝列表和关注列表，并且实现关注和取关功能。 由于关注成功和添加粉丝成功时同一个事务里的两个操作，可以使用 Redis 的事务 multi 来包装事务并进行提交。 除此之外，关注成功或者被关注还可以通过事件机制来生成发送邮件的事件，由异步的队列处理器来完成事件响应，同样是根据 Redis 来实现。 对于粉丝列表，除了显示粉丝的基本信息之外，还要显示当前用户是否关注了这个粉丝，以便前端显示。 对于关注列表来说，如果被关注对象是用户的话，除了显示用户的基本信息之外，还要显示当前用户是被这个用户关注，以便前端显示。 ## 推拉模式下的 Feed 流 ## 微博的新鲜事功能介绍：关注好友的动态（好友的点赞和发表的问题等），关注了某个问题，这些都是 feed 流的一部分。 在知乎中的 feed 流主要体现于：关注用户的评论行为，关注用户的关注问题行为。 feed 流主要分为两种，推模式和拉模式。推模式主要是把新鲜事推送给关注该用户的粉丝，本例使用 Redis 来存储某个用户接受的新鲜事 id 列表，这个信息流又称为 timeline，根据用户的唯一 key 来存储；拉模式主要是用户直接找寻自己所有关注的人，并且到数据库去查找这些关注对象的新鲜事，直接返回。 推模式主要适合粉丝较少的小用户，因为他们的粉丝量少，使用推模式产生的冗余副本也比较少，并且可以减少用户访问的压力。 拉模式主要适合大v，因为很多僵尸粉和非活跃用户根本不需要推送信息，用推模式发给这些僵尸粉或者非活跃用户就是浪费资源。所以让用户通过拉模式请求，只需要一个数据副本即可。同时如果是热点信息，这些信息也可以放在缓存，让用户首先拉取这些信息，提高查询效率。 使用 feedhandler 异步处理上述的两个事件，当事件发生时，根据事件实体进行重新包装，构造一个新鲜事，因为所有新鲜事的格式是一样的。需要包括：日期，新鲜事类型，发起者，新鲜事内容，然后把该数据存入数据库，以便用户使用 pull 模式拉出。 为了适配推送模式，此时也要把新鲜事放到该用户所有粉丝的 timeline 里，这样的话就同时实现了推和拉的操作了。 ## 使用爬虫对网站进行数据填充 ## 安装 Python3.x 并且配置环境变量。同时安装 PyCharm ,安装 pip。 安装好以后，先熟悉 Python 的语法，写一些例子，比如数据类型，操作符，方法调用，以及面向对象的技术。 因为数据是要导入数据库的，所以这里安装 MySQLdb 的一个库，并且写一下连接数据库的代码，写一下简单的crud进行测试。 使用 requests 库作为解析 HTTP 请求的工具，使用 beautifulsoup 作为解析 html 代码的工具，请求之后直接使用 css 选择器匹配。即可获得内容。 当然现在我们有更方便的工具 pyspider，可以方便解析请求并且可以设置代理，伪装身份等，直接传入 url 并且写好多级的解析函数，程序便会迭代执行，直到把所有页面的内容解析出来。这里我们直接启动 pyspider 的 web 应用并且写好 Python 代码，就可以执行爬虫了。 知乎：先找到问题，再把问题下所有的回答进行爬取，最后把问题和评论一起处理。 ## 将项目部署到 Linux 虚拟机 因为该项目只是个练手的 demo，没有必要买服务器，所以就打算直接部署到虚拟机上，把整个软件开发的流程过一遍。安装的是 VMware，下载的镜像是 CentOS 7 x86_64，依次安装了 JDK 1.8、Tomcat 8、MySQL 8.0 和 Redis（所有的配置过程网上博客都写得很详细，这里不加赘述）。
通过 Xshell 6 连接虚拟机。 把从 IDEA 编译导出的 jar 包发到虚拟机的文件夹，通过 `java -jar 文件名.jar` 将项目部署到 CentOS 上，当看到下面两个红色矩形框中的信息时，说明部署成功。

在主机上通过虚拟机的 ip 和对应的端口访问网页（相关功能请自行 fork 后导入 IDEA 并启动，在这里简要贴出几张效果图以便参考）：


## 功能扩展 ## - 用户注册，邮箱激活流程 - 管理员后台管理 - timeline 推拉结合 - 个性化首页，timeline 更多事件 - 搜索结果排序打分 - 通过 MQ 实现解耦、异步和削峰 ...... ================================================ FILE: wenda/.idea/compiler.xml ================================================ ================================================ FILE: wenda/.idea/encodings.xml ================================================ ================================================ FILE: wenda/.idea/inspectionProfiles/Project_Default.xml ================================================ ================================================ FILE: wenda/.idea/libraries/Maven__antlr_antlr_2_7_7.xml ================================================ ================================================ FILE: wenda/.idea/libraries/Maven__aopalliance_aopalliance_1_0.xml ================================================ ================================================ FILE: wenda/.idea/libraries/Maven__ch_qos_logback_logback_classic_1_1_7.xml 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'].join(''), listeners: [{ name: 'render', type: 'custom', handler: function () { var that = this; var oConf = that.rawConfig; var oEl = that.getEl(); // 常用元素 that.titleEl = oEl.find('span.js-title'); that.contentEl = oEl.find('div.js-content'); that.tipsEl = oEl.find('span.js-error'); // 调整大小 oEl.outerWidth(oConf.width || 520); oConf.height && that.contentEl.outerHeight(oConf.height); // 禁止body滚动 that.forbidScroll(document.body); // 创建遮罩层 that.initMask(); // 调整z-index oEl.css('zIndex', Popup.zIndex++); // 去掉头部 oConf.hasNoHeader && oEl.find('div.js-head').remove(); // 去掉底部 oConf.hasNoFooter && oEl.find('div.js-footer').remove(); // 位置居中 that.fixPosition(); // 绑定窗口变化事件 that.resizeCb = Base.bind(that.fixPosition, that); $(window).resize(that.resizeCb); } }, { name: 'destroy', type: 'custom', handler: function () { var that = this; // 启动滚动 !that.isForbidScroll && that.forbidScroll(document.body, false); // 移除遮罩层 that.maskEl && that.maskEl.remove(); // 取消窗口变化事件 $(window).unbind('resize', that.resizeCb); } }, { name: 'click .js-close', handler: function () { var that = this; that.close(); } }, { name: 'click .js-cancel', handler: function () { var that = this; var oConf = that.rawConfig; oConf.cancel && oConf.cancel.call(that); that.close(true); } }, { name: 'click .js-ok', handler: function () { var that = this; var oConf = that.rawConfig; // 禁止返回 if (oConf.ok && oConf.ok.call(that) === true) { return; } that.close(true); } }] }, { initialize: fInitialize, initMask: fInitMask, fixPosition: fFixPosition, close: fClose, error: fError, getData: fGetData }); function fInitialize(oConf) { var that = this; var oBody = $(document.body); oConf.renderTo = oBody; that.isForbidScroll = oBody.css('overflow-y') === 'hidden'; Popup.superClass.initialize.apply(that, arguments); } function fInitMask() { var that = this; var oConf = that.rawConfig; if (!that.maskEl) { that.maskEl = $('
'); oConf.renderTo.append(that.maskEl); } } function fFixPosition() { var that = this; var oEl = that.getEl(); var oWin = $(window); var oDoc = $(document); var nElWidth = oEl.width(); var nElHeight = oEl.height(); var nWinWidth = oWin.width(); var nWinHeight = oWin.height(); var nScrollTop = Math.max(oWin.scrollTop() || oDoc.scrollTop()); // 调整元素大小 oEl.css({ left: nWinWidth > nElWidth ? (nWinWidth - nElWidth) / 2 : 0, top: (nWinHeight > nElHeight ? (nWinHeight - nElHeight) / 2 : 0) + nScrollTop }); // 调整遮罩层大小 that.maskEl.css({ width: '100%', height: nWinHeight, top: nScrollTop }); } function fClose(bNoEmit) { var that = this; !bNoEmit && that.emit('close'); that.destroy(); } function fError(sContent) { var that = this; sContent = $.trim(sContent); that.tipsEl.html(sContent); that.tipsEl[sContent ? 'show' : 'hide'](); } function fGetData(oConf) { var that = this; return { title: oConf.title || '提示', content: oConf.content, cancelTxt: oConf.cancelTxt || '取消', okTxt: oConf.okTxt || '确定' }; } })(window); ================================================ FILE: wenda/src/main/resources/static/scripts/main/component/popupAdd.js ================================================ /** var oPopupAdd = new PopupAdd({ data: 初始数据 ok: Function, 发布成功后的回调 }); */ (function (window) { var PopupAdd = Base.createClass('main.component.PopupAdd'); var Popup = Base.getClass('main.component.Popup'); var Component = Base.getClass('main.component.Component'); var Util = Base.getClass('main.base.Util'); Base.mix(PopupAdd, Component, { _tpl: [ '
', '
', '
', '', '
', '
', '
', '
问题说明（可选）：
', '
', '
', '
', '
', '', '
', '
', '
', '
', '
', '
'].join(''), listeners: [{ name: 'render', type: 'custom', handler: function () { var that = this; var oConf = that.rawConfig; var oEl = that.getEl(); that.titleIpt = oEl.find('.js-title'); that.contentIpt = oEl.find('.js-content'); // 还原值 oConf.data && that.val(oConf.data); } }], show: fStaticShow }, { initialize: fInitialize, val: fVal }); function fStaticShow(oConf) { var that = this; var oAdd = new PopupAdd(oConf); var bSubmit = false; var oPopup = new Popup({ width: 540, title: '提问', okTxt: '发布', content: oAdd.html(), ok: function () { var that = this; var oData = oAdd.val(); if (!oData.title) { that.error('请填写标题'); return true; } // 避免重复提交 if (bSubmit) { return true; } bSubmit = true; // 提交内容 $.ajax({ url: '/question/add', type: 'post', data: oData, dataType: 'json' }).done(function (oResult) { // 未登陆，跳转到登陆页面 if (oResult.code === 999) { window.location.href = '/reglogin?next=' + window.encodeURIComponent(window.location.href); } else { oConf.ok && oConf.ok.call(that); oAdd.emit('ok'); } }).fail(function () { alert('出现错误，请重试'); }).always(function () { bSubmit = false; }); // 先不关闭 return true; }, listeners: { destroy: function () { oAdd.destroy(); } } }); oAdd._popup = oPopup; Component.setEvents(); } function fInitialize(oConf) { var that = this; delete oConf.renderTo; PopupAdd.superClass.initialize.apply(that, arguments); } function fVal(oData) { var that = this; if (arguments.length === 0) { return { title: $.trim(that.titleIpt.val()), content: $.trim(that.contentIpt.val()) }; } else { oData = oData || {}; that.titleIpt.val($.tirm(oData.title)); that.contentIpt.val($.trim(oData.content)); } } })(window); ================================================ FILE: wenda/src/main/resources/static/scripts/main/component/popupMsg.js ================================================ /** var oPopupAdd = new PopupAdd({ data: 初始数据 toName: String, 姓名 content: String, 内容 }); */ (function (window) { var PopupMsg = Base.createClass('main.component.PopupMsg'); var Popup = Base.getClass('main.component.Popup'); var Component = Base.getClass('main.component.Component'); var Util = Base.getClass('main.base.Util'); Base.mix(PopupMsg, Component, { _tpl: [ '
', '
', '
发给：
', '
', '', '
', '
', '
', '
内容：
', '
', '
', '
', '
', '', '
', '
', '
', '
', '
', '
'].join(''), listeners: [{ name: 'render', type: 'custom', handler: function () { var that = this; var oConf = that.rawConfig; var oEl = that.getEl(); that.nameIpt = oEl.find('.js-name'); that.contentIpt = oEl.find('.js-content'); // 还原值 oConf.data && that.val(oConf.data); } }], show: fStaticShow }, { initialize: fInitialize, val: fVal }); function fStaticShow(oConf) { var that = this; var oAdd = new PopupMsg(oConf); var bSubmit = false; var oPopup = new Popup({ width: 540, title: '发送私信', okTxt: '发送', content: oAdd.html(), ok: function () { var that = this; var oData = oAdd.val(); if (!oData.toName) { that.error('请填写姓名'); return true; } if (!oData.content) { that.error('请填写私信内容'); return true; } // 避免重复提交 if (bSubmit) { return true; } bSubmit = true; // 提交内容 $.ajax({ url: '/msg/addMessage', type: 'post', data: oData, dataType: 'json' }).done(function (oResult) { // 未登陆，跳转到登陆页面 if (oResult.code === 999) { window.location.href = '/reglogin?next=' + window.encodeURIComponent(window.location.href); } else if (oResult.code !== 0) { that.error(oResult.msg || '出现错误，请重试'); } else { oConf.ok && oConf.ok.call(that); oAdd.emit('ok'); } }).fail(function () { alert('出现错误，请重试'); }).always(function () { bSubmit = false; }); // 先不关闭 return true; }, listeners: { destroy: function () { oAdd.destroy(); } } }); oAdd._popup = oPopup; Component.setEvents(); } function fInitialize(oConf) { var that = this; delete oConf.renderTo; PopupMsg.superClass.initialize.apply(that, arguments); } function fVal(oData) { var that = this; if (arguments.length === 0) { return { toName: $.trim(that.nameIpt.val()), content: $.trim(that.contentIpt.val()) }; } else { oData = oData || {}; that.nameIpt.val($.tirm(oData.toName)); that.contentIpt.val($.trim(oData.content)); } } })(window); ================================================ FILE: wenda/src/main/resources/static/scripts/main/jquery.js ================================================ /*! * jQuery JavaScript Library v3.0.0 * https://jquery.com/ * * Includes Sizzle.js * https://sizzlejs.com/ * * Copyright jQuery Foundation and other contributors * Released under the MIT license * https://jquery.org/license * * Date: 2016-06-09T18:02Z */ ( function( global, factory ) { "use strict"; if ( typeof module === "object" && typeof module.exports === "object" ) { // For CommonJS and CommonJS-like environments where a proper `window` // is present, execute the factory and get jQuery. // For environments that do not have a `window` with a `document` // (such as Node.js), expose a factory as module.exports. // This accentuates the need for the creation of a real `window`. // e.g. var jQuery = require("jquery")(window); // See ticket #14549 for more info. module.exports = global.document ? factory( global, true ) : function( w ) { if ( !w.document ) { throw new Error( "jQuery requires a window with a document" ); } return factory( w ); }; } else { factory( global ); } // Pass this if window is not defined yet }( typeof window !== "undefined" ? window : this, function( window, noGlobal ) { // Edge <= 12 - 13+, Firefox <=18 - 45+, IE 10 - 11, Safari 5.1 - 9+, iOS 6 - 9.1 // throw exceptions when non-strict code (e.g., ASP.NET 4.5) accesses strict mode // arguments.callee.caller (trac-13335). But as of jQuery 3.0 (2016), strict mode should be common // enough that all such attempts are guarded in a try block. "use strict"; var arr = []; var document = window.document; var getProto = Object.getPrototypeOf; var slice = arr.slice; var concat = arr.concat; var push = arr.push; var indexOf = arr.indexOf; var class2type = {}; var toString = class2type.toString; var hasOwn = class2type.hasOwnProperty; var fnToString = hasOwn.toString; var ObjectFunctionString = fnToString.call( Object ); var support = {}; function DOMEval( code, doc ) { doc = doc || document; var script = doc.createElement( "script" ); script.text = code; doc.head.appendChild( script ).parentNode.removeChild( script ); } var version = "3.0.0", // Define a local copy of jQuery jQuery = function( selector, context ) { // The jQuery object is actually just the init constructor 'enhanced' // Need init if jQuery is called (just allow error to be thrown if not included) return new jQuery.fn.init( selector, context ); }, // Support: Android <=4.0 only // Make sure we trim BOM and NBSP rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, // Matches dashed string for camelizing rmsPrefix = /^-ms-/, rdashAlpha = /-([a-z])/g, // Used by jQuery.camelCase as callback to replace() fcamelCase = function( all, letter ) { return letter.toUpperCase(); }; jQuery.fn = jQuery.prototype = { // The current version of jQuery being used jquery: version, constructor: jQuery, // The default length of a jQuery object is 0 length: 0, toArray: function() { return slice.call( this ); }, // Get the Nth element in the matched element set OR // Get the whole matched element set as a clean array get: function( num ) { return num != null ? // Return just the one element from the set ( num < 0 ? this[ num + this.length ] : this[ num ] ) : // Return all the elements in a clean array slice.call( this ); }, // Take an array of elements and push it onto the stack // (returning the new matched element set) pushStack: function( elems ) { // Build a new jQuery matched element set var ret = jQuery.merge( this.constructor(), elems ); // Add the old object onto the stack (as a reference) ret.prevObject = this; // Return the newly-formed element set return ret; }, // Execute a callback for every element in the matched set. each: function( callback ) { return jQuery.each( this, callback ); }, map: function( callback ) { return this.pushStack( jQuery.map( this, function( elem, i ) { return callback.call( elem, i, elem ); } ) ); }, slice: function() { return this.pushStack( slice.apply( this, arguments ) ); }, first: function() { return this.eq( 0 ); }, last: function() { return this.eq( -1 ); }, eq: function( i ) { var len = this.length, j = +i + ( i < 0 ? len : 0 ); return this.pushStack( j >= 0 && j < len ? [ this[ j ] ] : [] ); }, end: function() { return this.prevObject || this.constructor(); }, // For internal use only. // Behaves like an Array's method, not like a jQuery method. push: push, sort: arr.sort, splice: arr.splice }; jQuery.extend = jQuery.fn.extend = function() { var options, name, src, copy, copyIsArray, clone, target = arguments[ 0 ] || {}, i = 1, length = arguments.length, deep = false; // Handle a deep copy situation if ( typeof target === "boolean" ) { deep = target; // Skip the boolean and the target target = arguments[ i ] || {}; i++; } // Handle case when target is a string or something (possible in deep copy) if ( typeof target !== "object" && !jQuery.isFunction( target ) ) { target = {}; } // Extend jQuery itself if only one argument is passed if ( i === length ) { target = this; i--; } for ( ; i < length; i++ ) { // Only deal with non-null/undefined values if ( ( options = arguments[ i ] ) != null ) { // Extend the base object for ( name in options ) { src = target[ name ]; copy = options[ name ]; // Prevent never-ending loop if ( target === copy ) { continue; } // Recurse if we're merging plain objects or arrays if ( deep && copy && ( jQuery.isPlainObject( copy ) || ( copyIsArray = jQuery.isArray( copy ) ) ) ) { if ( copyIsArray ) { copyIsArray = false; clone = src && jQuery.isArray( src ) ? src : []; } else { clone = src && jQuery.isPlainObject( src ) ? src : {}; } // Never move original objects, clone them target[ name ] = jQuery.extend( deep, clone, copy ); // Don't bring in undefined values } else if ( copy !== undefined ) { target[ name ] = copy; } } } } // Return the modified object return target; }; jQuery.extend( { // Unique for each copy of jQuery on the page expando: "jQuery" + ( version + Math.random() ).replace( /\D/g, "" ), // Assume jQuery is ready without the ready module isReady: true, error: function( msg ) { throw new Error( msg ); }, noop: function() {}, isFunction: function( obj ) { return jQuery.type( obj ) === "function"; }, isArray: Array.isArray, isWindow: function( obj ) { return obj != null && obj === obj.window; }, isNumeric: function( obj ) { // As of jQuery 3.0, isNumeric is limited to // strings and numbers (primitives or objects) // that can be coerced to finite numbers (gh-2662) var type = jQuery.type( obj ); return ( type === "number" || type === "string" ) && // parseFloat NaNs numeric-cast false positives ("") // ...but misinterprets leading-number strings, particularly hex literals ("0x...") // subtraction forces infinities to NaN !isNaN( obj - parseFloat( obj ) ); }, isPlainObject: function( obj ) { var proto, Ctor; // Detect obvious negatives // Use toString instead of jQuery.type to catch host objects if ( !obj || toString.call( obj ) !== "[object Object]" ) { return false; } proto = getProto( obj ); // Objects with no prototype (e.g., `Object.create( null )`) are plain if ( !proto ) { return true; } // Objects with prototype are plain iff they were constructed by a global Object function Ctor = hasOwn.call( proto, "constructor" ) && proto.constructor; return typeof Ctor === "function" && fnToString.call( Ctor ) === ObjectFunctionString; }, isEmptyObject: function( obj ) { var name; for ( name in obj ) { return false; } return true; }, type: function( obj ) { if ( obj == null ) { return obj + ""; } // Support: Android <=2.3 only (functionish RegExp) return typeof obj === "object" || typeof obj === "function" ? class2type[ toString.call( obj ) ] || "object" : typeof obj; }, // Evaluates a script in a global context globalEval: function( code ) { DOMEval( code ); }, // Convert dashed to camelCase; used by the css and data modules // Support: IE <=9 - 11, Edge 12 - 13 // Microsoft forgot to hump their vendor prefix (#9572) camelCase: function( string ) { return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase ); }, nodeName: function( elem, name ) { return elem.nodeName && elem.nodeName.toLowerCase() === name.toLowerCase(); }, each: function( obj, callback ) { var length, i = 0; if ( isArrayLike( obj ) ) { length = obj.length; for ( ; i < length; i++ ) { if ( callback.call( obj[ i ], i, obj[ i ] ) === false ) { break; } } } else { for ( i in obj ) { if ( callback.call( obj[ i ], i, obj[ i ] ) === false ) { break; } } } return obj; }, // Support: Android <=4.0 only trim: function( text ) { return text == null ? "" : ( text + "" ).replace( rtrim, "" ); }, // results is for internal usage only makeArray: function( arr, results ) { var ret = results || []; if ( arr != null ) { if ( isArrayLike( Object( arr ) ) ) { jQuery.merge( ret, typeof arr === "string" ? [ arr ] : arr ); } else { push.call( ret, arr ); } } return ret; }, inArray: function( elem, arr, i ) { return arr == null ? -1 : indexOf.call( arr, elem, i ); }, // Support: Android <=4.0 only, PhantomJS 1 only // push.apply(_, arraylike) throws on ancient WebKit merge: function( first, second ) { var len = +second.length, j = 0, i = first.length; for ( ; j < len; j++ ) { first[ i++ ] = second[ j ]; } first.length = i; return first; }, grep: function( elems, callback, invert ) { var callbackInverse, matches = [], i = 0, length = elems.length, callbackExpect = !invert; // Go through the array, only saving the items // that pass the validator function for ( ; i < length; i++ ) { callbackInverse = !callback( elems[ i ], i ); if ( callbackInverse !== callbackExpect ) { matches.push( elems[ i ] ); } } return matches; }, // arg is for internal usage only map: function( elems, callback, arg ) { var length, value, i = 0, ret = []; // Go through the array, translating each of the items to their new values if ( isArrayLike( elems ) ) { length = elems.length; for ( ; i < length; i++ ) { value = callback( elems[ i ], i, arg ); if ( value != null ) { ret.push( value ); } } // Go through every key on the object, } else { for ( i in elems ) { value = callback( elems[ i ], i, arg ); if ( value != null ) { ret.push( value ); } } } // Flatten any nested arrays return concat.apply( [], ret ); }, // A global GUID counter for objects guid: 1, // Bind a function to a context, optionally partially applying any // arguments. proxy: function( fn, context ) { var tmp, args, proxy; if ( typeof context === "string" ) { tmp = fn[ context ]; context = fn; fn = tmp; } // Quick check to determine if target is callable, in the spec // this throws a TypeError, but we will just return undefined. if ( !jQuery.isFunction( fn ) ) { return undefined; } // Simulated bind args = slice.call( arguments, 2 ); proxy = function() { return fn.apply( context || this, args.concat( slice.call( arguments ) ) ); }; // Set the guid of unique handler to the same of original handler, so it can be removed proxy.guid = fn.guid = fn.guid || jQuery.guid++; return proxy; }, now: Date.now, // jQuery.support is not used in Core but other projects attach their // properties to it so it needs to exist. support: support } ); // JSHint would error on this code due to the Symbol not being defined in ES5. // Defining this global in .jshintrc would create a danger of using the global // unguarded in another place, it seems safer to just disable JSHint for these // three lines. /* jshint ignore: start */ if ( typeof Symbol === "function" ) { jQuery.fn[ Symbol.iterator ] = arr[ Symbol.iterator ]; } /* jshint ignore: end */ // Populate the class2type map jQuery.each( "Boolean Number String Function Array Date RegExp Object Error Symbol".split( " " ), function( i, name ) { class2type[ "[object " + name + "]" ] = name.toLowerCase(); } ); function isArrayLike( obj ) { // Support: real iOS 8.2 only (not reproducible in simulator) // `in` check used to prevent JIT error (gh-2145) // hasOwn isn't used here due to false negatives // regarding Nodelist length in IE var length = !!obj && "length" in obj && obj.length, type = jQuery.type( obj ); if ( type === "function" || jQuery.isWindow( obj ) ) { return false; } return type === "array" || length === 0 || typeof length === "number" && length > 0 && ( length - 1 ) in obj; } var Sizzle = /*! * Sizzle CSS Selector Engine v2.3.0 * https://sizzlejs.com/ * * Copyright jQuery Foundation and other contributors * Released under the MIT license * http://jquery.org/license * * Date: 2016-01-04 */ (function( window ) { var i, support, Expr, getText, isXML, tokenize, compile, select, outermostContext, sortInput, hasDuplicate, // Local document vars setDocument, document, docElem, documentIsHTML, rbuggyQSA, rbuggyMatches, matches, contains, // Instance-specific data expando = "sizzle" + 1 * new Date(), preferredDoc = window.document, dirruns = 0, done = 0, classCache = createCache(), tokenCache = createCache(), compilerCache = createCache(), sortOrder = function( a, b ) { if ( a === b ) { hasDuplicate = true; } return 0; }, // Instance methods hasOwn = ({}).hasOwnProperty, arr = [], pop = arr.pop, push_native = arr.push, push = arr.push, slice = arr.slice, // Use a stripped-down indexOf as it's faster than native // https://jsperf.com/thor-indexof-vs-for/5 indexOf = function( list, elem ) { var i = 0, len = list.length; for ( ; i < len; i++ ) { if ( list[i] === elem ) { return i; } } return -1; }, booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped", // Regular expressions // http://www.w3.org/TR/css3-selectors/#whitespace whitespace = "[\\x20\\t\\r\\n\\f]", // http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier identifier = "(?:\\\\.|[\\w-]|[^\0-\\xa0])+", // Attribute selectors: http://www.w3.org/TR/selectors/#attribute-selectors attributes = "\\[" + whitespace + "*(" + identifier + ")(?:" + whitespace + // Operator (capture 2) "*([*^$|!~]?=)" + whitespace + // "Attribute values must be CSS identifiers [capture 5] or strings [capture 3 or capture 4]" "*(?:'((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\"|(" + identifier + "))|)" + whitespace + "*\\]", pseudos = ":(" + identifier + ")(?:\\((" + // To reduce the number of selectors needing tokenize in the preFilter, prefer arguments: // 1. quoted (capture 3; capture 4 or capture 5) "('((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\")|" + // 2. simple (capture 6) "((?:\\\\.|[^\\\\()[\\]]|" + attributes + ")*)|" + // 3. anything else (capture 2) ".*" + ")\\)|)", // Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter rwhitespace = new RegExp( whitespace + "+", "g" ), rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ), rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ), rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ), rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ), rpseudo = new RegExp( pseudos ), ridentifier = new RegExp( "^" + identifier + "$" ), matchExpr = { "ID": new RegExp( "^#(" + identifier + ")" ), "CLASS": new RegExp( "^\\.(" + identifier + ")" ), "TAG": new RegExp( "^(" + identifier + "|[*])" ), "ATTR": new RegExp( "^" + attributes ), "PSEUDO": new RegExp( "^" + pseudos ), "CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace + "*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace + "*(\\d+)|))" + whitespace + "*\\)|)", "i" ), "bool": new RegExp( "^(?:" + booleans + ")$", "i" ), // For use in libraries implementing .is() // We use this for POS matching in `select` "needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" + whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" ) }, rinputs = /^(?:input|select|textarea|button)$/i, rheader = /^h\d$/i, rnative = /^[^{]+\{\s*\[native \w/, // Easily-parseable/retrievable ID or TAG or CLASS selectors rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/, rsibling = /[+~]/, // CSS escapes // http://www.w3.org/TR/CSS21/syndata.html#escaped-characters runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ), funescape = function( _, escaped, escapedWhitespace ) { var high = "0x" + escaped - 0x10000; // NaN means non-codepoint // Support: Firefox<24 // Workaround erroneous numeric interpretation of +"0x" return high !== high || escapedWhitespace ? escaped : high < 0 ? // BMP codepoint String.fromCharCode( high + 0x10000 ) : // Supplemental Plane codepoint (surrogate pair) String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 ); }, // CSS string/identifier serialization // https://drafts.csswg.org/cssom/#common-serializing-idioms rcssescape = /([\0-\x1f\x7f]|^-?\d)|^-$|[^\x80-\uFFFF\w-]/g, fcssescape = function( ch, asCodePoint ) { if ( asCodePoint ) { // U+0000 NULL becomes U+FFFD REPLACEMENT CHARACTER if ( ch === "\0" ) { return "\uFFFD"; } // Control characters and (dependent upon position) numbers get escaped as code points return ch.slice( 0, -1 ) + "\\" + ch.charCodeAt( ch.length - 1 ).toString( 16 ) + " "; } // Other potentially-special ASCII characters get backslash-escaped return "\\" + ch; }, // Used for iframes // See setDocument() // Removing the function wrapper causes a "Permission Denied" // error in IE unloadHandler = function() { setDocument(); }, disabledAncestor = addCombinator( function( elem ) { return elem.disabled === true; }, { dir: "parentNode", next: "legend" } ); // Optimize for push.apply( _, NodeList ) try { push.apply( (arr = slice.call( preferredDoc.childNodes )), preferredDoc.childNodes ); // Support: Android<4.0 // Detect silently failing push.apply arr[ preferredDoc.childNodes.length ].nodeType; } catch ( e ) { push = { apply: arr.length ? // Leverage slice if possible function( target, els ) { push_native.apply( target, slice.call(els) ); } : // Support: IE<9 // Otherwise append directly function( target, els ) { var j = target.length, i = 0; // Can't trust NodeList.length while ( (target[j++] = els[i++]) ) {} target.length = j - 1; } }; } function Sizzle( selector, context, results, seed ) { var m, i, elem, nid, match, groups, newSelector, newContext = context && context.ownerDocument, // nodeType defaults to 9, since context defaults to document nodeType = context ? context.nodeType : 9; results = results || []; // Return early from calls with invalid selector or context if ( typeof selector !== "string" || !selector || nodeType !== 1 && nodeType !== 9 && nodeType !== 11 ) { return results; } // Try to shortcut find operations (as opposed to filters) in HTML documents if ( !seed ) { if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) { setDocument( context ); } context = context || document; if ( documentIsHTML ) { // If the selector is sufficiently simple, try using a "get*By*" DOM method // (excepting DocumentFragment context, where the methods don't exist) if ( nodeType !== 11 && (match = rquickExpr.exec( selector )) ) { // ID selector if ( (m = match[1]) ) { // Document context if ( nodeType === 9 ) { if ( (elem = context.getElementById( m )) ) { // Support: IE, Opera, Webkit // TODO: identify versions // getElementById can match elements by name instead of ID if ( elem.id === m ) { results.push( elem ); return results; } } else { return results; } // Element context } else { // Support: IE, Opera, Webkit // TODO: identify versions // getElementById can match elements by name instead of ID if ( newContext && (elem = newContext.getElementById( m )) && contains( context, elem ) && elem.id === m ) { results.push( elem ); return results; } } // Type selector } else if ( match[2] ) { push.apply( results, context.getElementsByTagName( selector ) ); return results; // Class selector } else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) { push.apply( results, context.getElementsByClassName( m ) ); return results; } } // Take advantage of querySelectorAll if ( support.qsa && !compilerCache[ selector + " " ] && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) { if ( nodeType !== 1 ) { newContext = context; newSelector = selector; // qSA looks outside Element context, which is not what we want // Thanks to Andrew Dupont for this workaround technique // Support: IE <=8 // Exclude object elements } else if ( context.nodeName.toLowerCase() !== "object" ) { // Capture the context ID, setting it first if necessary if ( (nid = context.getAttribute( "id" )) ) { nid = nid.replace( rcssescape, fcssescape ); } else { context.setAttribute( "id", (nid = expando) ); } // Prefix every selector in the list groups = tokenize( selector ); i = groups.length; while ( i-- ) { groups[i] = "#" + nid + " " + toSelector( groups[i] ); } newSelector = groups.join( "," ); // Expand context for sibling selectors newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context; } if ( newSelector ) { try { push.apply( results, newContext.querySelectorAll( newSelector ) ); return results; } catch ( qsaError ) { } finally { if ( nid === expando ) { context.removeAttribute( "id" ); } } } } } } // All others return select( selector.replace( rtrim, "$1" ), context, results, seed ); } /** * Create key-value caches of limited size * @returns {function(string, object)} Returns the Object data after storing it on itself with * property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength) * deleting the oldest entry */ function createCache() { var keys = []; function cache( key, value ) { // Use (key + " ") to avoid collision with native prototype properties (see Issue #157) if ( keys.push( key + " " ) > Expr.cacheLength ) { // Only keep the most recent entries delete cache[ keys.shift() ]; } return (cache[ key + " " ] = value); } return cache; } /** * Mark a function for special use by Sizzle * @param {Function} fn The function to mark */ function markFunction( fn ) { fn[ expando ] = true; return fn; } /** * Support testing using an element * @param {Function} fn Passed the created element and returns a boolean result */ function assert( fn ) { var el = document.createElement("fieldset"); try { return !!fn( el ); } catch (e) { return false; } finally { // Remove from its parent by default if ( el.parentNode ) { el.parentNode.removeChild( el ); } // release memory in IE el = null; } } /** * Adds the same handler for all of the specified attrs * @param {String} attrs Pipe-separated list of attributes * @param {Function} handler The method that will be applied */ function addHandle( attrs, handler ) { var arr = attrs.split("|"), i = arr.length; while ( i-- ) { Expr.attrHandle[ arr[i] ] = handler; } } /** * Checks document order of two siblings * @param {Element} a * @param {Element} b * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b */ function siblingCheck( a, b ) { var cur = b && a, diff = cur && a.nodeType === 1 && b.nodeType === 1 && a.sourceIndex - b.sourceIndex; // Use IE sourceIndex if available on both nodes if ( diff ) { return diff; } // Check if b follows a if ( cur ) { while ( (cur = cur.nextSibling) ) { if ( cur === b ) { return -1; } } } return a ? 1 : -1; } /** * Returns a function to use in pseudos for input types * @param {String} type */ function createInputPseudo( type ) { return function( elem ) { var name = elem.nodeName.toLowerCase(); return name === "input" && elem.type === type; }; } /** * Returns a function to use in pseudos for buttons * @param {String} type */ function createButtonPseudo( type ) { return function( elem ) { var name = elem.nodeName.toLowerCase(); return (name === "input" || name === "button") && elem.type === type; }; } /** * Returns a function to use in pseudos for :enabled/:disabled * @param {Boolean} disabled true for :disabled; false for :enabled */ function createDisabledPseudo( disabled ) { // Known :disabled false positives: // IE: *[disabled]:not(button, input, select, textarea, optgroup, option, menuitem, fieldset) // not IE: fieldset[disabled] > legend:nth-of-type(n+2) :can-disable return function( elem ) { // Check form elements and option elements for explicit disabling return "label" in elem && elem.disabled === disabled || "form" in elem && elem.disabled === disabled || // Check non-disabled form elements for fieldset[disabled] ancestors "form" in elem && elem.disabled === false && ( // Support: IE6-11+ // Ancestry is covered for us elem.isDisabled === disabled || // Otherwise, assume any non-