前言

采用SSM整合开发一个web系统是这学期web期末项目考核，前前后后花了八九天的时间，一个bug能玩一天，真是令人焦头烂额，著此博客复盘记录，颗粒入仓。_{写得不好有错请指出}

主要功能

• 用户的登录，注册和注销
• 修改个人资料，查看/查找商品
• 写留言和回复，查自己的留言，删除自己的留言和回复
• 管理员对商品的增删改查以及批量删除
• 防盗链，分页，时间显示等
  商品方面目前要求只是增删改查，扩展的订单购买退货等未开发。

数据库设计

1. product表，描述商品相关信息，主键pid，包含名字，品牌价格等。
2. user表，用户存储相关信息，主键uid，包含账密，邮箱，和权限(管理员，普通用户)
3. message表，留言表相关，主键mid，包含标题，内容，时间等，对应外键uid和pid，即某用户关于某商品的留言。
4. revert表，回复相关表，包含回复内容等，对应外键uid和mid，即某用户对某条留言的回复。

关于级联删除使用references…cascade语句实现，级联更新采用触发器，例在新增回复后更新留言表的回复数字段。

整体架构

采用Spring+SpringMVC+Mybatis整合开发，分享一个B站教程。

• 前端界面发送一个ajax请求到服务器tomcat
• SpringMVC前端控制器拦截请求，基于注解开发的方式寻找映射路径，调用相应Controller类的方法
• @Autowired自动注入Service，并调用Service层相应方法
• Service同样自动注入了DAO层的mapper接口，调用相应的mapper方法执行数据库操作
• 接口对应的mapper.xml配置文件，就是具体实现，包括具体sql语句等
• 在数据库获取到数据后，最后以json字符串的形式返回给前端
• 整个项目的jar包依赖通过maven来管理
  

技术介绍

为此我还写了一些前置博客来具体介绍，点击链接进入。

1. Maven项目管理(jar包)
2. Bootstrap前端框架(样式，模态框等)
3. MyBatis Generator逆向工程(根据数据库生成Mapper文件等)
4. JSR303后端检验
5. JQuery框架(前端校验，事件处理等)和ajax技术（动态请求数据，局部刷新/异步更新等）并以json数据格式（实现服务器和客户端跨平台(浏览器，安卓，ios等))返回数据。
6. pageHelper分页

效果演示

_{商品数据来源网络，侵删}
登录页面

注册(验证失败)

用户界面

讨论区(留言板)的详情界面

管理员界面

配置代码

数据库代码

/*==============================================================*/
/* DBMS name:      MySQL 5.0                                    */
/* Created on:     2020/5/20 21:43:05                           */
/*==============================================================*/drop table if exists revert;drop table if exists message;drop table if exists product;drop table if exists user;/*==============================================================*/
/* Table: message                                               */
/*==============================================================*/
create table message
(mid            int not null AUTO_INCREMENT,uid               int,pid            int,title                varchar(25),content              varchar(200),time                 varchar(25),revertCount          int default 0,primary key (mid)
);/*==============================================================*/
/* Table: product                                               */
/*==============================================================*/
create table product
(pid            int not null AUTO_INCREMENT,name          varchar(30),brand                 varchar(25),model                varchar(25),price                numeric(10,1)check(price>0),picture              varchar(100),introduction         varchar(200),primary key (pid)
);/*==============================================================*/
/* Table: revert                                                */
/*==============================================================*/
create table revert
(rid             int not null AUTO_INCREMENT,mid            int,uid               int,content              varchar(200),time                 varchar(25),primary key (rid)
);/*==============================================================*/
/* Table: user                                                  */
/*==============================================================*/
create table user
(uid               int not null AUTO_INCREMENT,password             varchar(25),name             varchar(30),email                varchar(30),role                 varchar(10) default 'users',primary key (uid)
);alter table message add constraint FK_Relationship_2 foreign key (pid)references product (pid) on delete cascade on update cascade;alter table message add constraint FK_Relationship_4 foreign key (uid)references user (uid) on delete cascade on update cascade;alter table revert add constraint FK_Relationship_3 foreign key (mid)references message (mid) on delete cascade on update cascade;alter table revert add constraint FK_Relationship_5 foreign key (uid)references user (uid) on delete cascade on update cascade;create trigger trOnMessage
after insert on revert for each rowupdate message set revertCount=revertCount+1 where mid=new.mid;

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>jmu.wzl</groupId><artifactId>experiment-9</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><!-- 引入项目依赖jar包 --><dependencies><!-- Springmvc,Spring --><!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.7.RELEASE</version></dependency><!-- Spring-jdbc --><!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>4.3.7.RELEASE</version></dependency><!-- Spring面向切面编程 --><!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects --><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>4.3.7.RELEASE</version></dependency><!-- MyBatis --><!-- https://mvnrepository.com/artifact/org.mybatis/mybatis --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.4.2</version></dependency><!-- MyBatis整合Spring适配包 --><!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.1</version></dependency><!-- 数据库连接池，驱动 --><!-- https://mvnrepository.com/artifact/c3p0/c3p0 --><dependency><groupId>c3p0</groupId><artifactId>c3p0</artifactId><version>0.9.1.2</version></dependency><!-- Mysql驱动 --><!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.19</version></dependency><!-- jstl --><!-- https://mvnrepository.com/artifact/jstl/jstl --><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!-- servlet-api --><!-- https://mvnrepository.com/artifact/javax.servlet/servlet-api --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.0.1</version><scope>provided</scope></dependency><!-- junit --><!-- https://mvnrepository.com/artifact/junit/junit --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><!-- MyBatis Generator --><!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core --><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.5</version></dependency><!-- Spring test --><!-- https://mvnrepository.com/artifact/org.springframework/spring-test --><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>4.3.7.RELEASE</version><scope>test</scope></dependency><!-- PageHelper分页插件 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>5.0.0</version></dependency><!-- taglibs --><dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version></dependency><!-- jackson(返回json字符串的支持) --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.8.8</version></dependency><!-- JSR303数据校验支持 --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-validator</artifactId><version>5.1.0.Final</version></dependency><dependency><groupId>javax.el</groupId><artifactId>javax.el-api</artifactId><version>3.0.0</version></dependency></dependencies>
</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"><!--1.启动Spring容器  --><!-- needed for ContextLoaderListener --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><!-- Bootstraps the root web application context before servlet initialization --><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- 2.SpringMvc前端控制器（拦截请求） --><!-- The front controller of this Spring Web application, responsible for handling all application requests --><servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><!-- Map all requests to the DispatcherServlet for handling --><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping><!-- 3.字符编码过滤器 --><filter><filter-name>CharacterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param><init-param><param-name>forceRequestEncoding</param-name><param-value>true</param-value></init-param><init-param><param-name>forceResponseEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- 4.Rest风格uri（post请求转为delete/put请求） --><filter><filter-name>HiddenHttpMethodFilter</filter-name><filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class></filter><filter-mapping><filter-name>HiddenHttpMethodFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><filter><filter-name>httpPutFormContentFilter</filter-name><filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class></filter><filter-mapping><filter-name>httpPutFormContentFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>
</web-app>

dispatcherServlet-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"><!-- 1.SpringMvc配置文件(网站跳转逻辑) --><context:component-scan base-package="jmu.wzl" use-default-filters="false"><!-- 只扫描控制器 --><context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/></context:component-scan><!-- 2.视图解析器配置（方便页面返回） --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/views/"></property><property name="suffix" value=".jsp"></property></bean><!-- 3.标准配置 --><!-- 3.1将SpringMvc不能处理的请求交给tomcat --><mvc:default-servlet-handler/><!-- 3.2支持SpringMvc高级功能 (JSR303校验，快捷ajax,映射动态请求)--><mvc:annotation-driven/>
</beans>

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"><!-- Spring配置文件核心点(数据源，MyBatis整合，事务控制) --><!-- 扫描控制器外的所有(控制器SpringMvc扫了) --><context:component-scan base-package="jmu.wzl"><context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/></context:component-scan><!-- 数据源  --><context:property-placeholder location="classpath:dbconfig.properties"/><bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property><property name="driverClass" value="${jdbc.driverClass}"></property><property name="user" value="${jdbc.user}"></property><property name="password" value="${jdbc.password}"></property></bean><!-- MyBatis整合配置 --><bean id="SqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean"><!-- 指定 MyBatis全局配置文件--><property name="configLocation" value="classpath:myBatis-config.xml"></property><property name="dataSource" ref="pooledDataSource"></property><!-- 指定MyBatis。mapper文件的位置 --><property name="mapperLocations" value="classpath:mapper/*.xml"></property></bean><!-- 扫描器配置(将MyBatis接口实现加入待ioc容器) --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><!-- 扫描所有dao接口的实现加入ioc容器 --><property name="basePackage" value="jmu.wzl"></property></bean><!-- 事务控制配置 --><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><!-- 控制住数据源 --><property name="dataSource" ref="pooledDataSource"></property></bean><!-- 开启基于注解的事务，使用xml配置形式的事务 --><aop:config><!-- 切入点表达式 --><aop:pointcut expression="execution(* jmu.wzl.service..*(..))" id="txPoint"/><!-- 配置事务 --><aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/></aop:config><!-- 配置事务增强(事务如何切入) --><tx:advice id="txAdvice"><tx:attributes><!-- 所有方法都是事务方法 --><tx:method name="*"/><!-- 以get开始的所有方法 --><tx:method name="get*" read-only="true"/></tx:attributes></tx:advice></beans>

完整源码

github下载地址