虽然已经在做关于SpringMVC的项目。但是还没有写一些比较系统的博客。今天就先来说一说最简单的增删改查吧。这个例子是基于SpringMVC+Spring+Mybatis实现的。

环境配置

主要是几项配置：springmvc的配置，spring的配置，MyBatis的配置，jdbc的配置，和web.xml配置

springmvc.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:mvc="http://www.springframework.org/schema/mvc"
    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-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
    <!-- 文件扫描 -->
    <context:component-scan base-package="com.zhao"></context:component-scan>
    
    <!-- annotation-driven:默认创建了多个对象：RequestMappingHandlerMapping，RequestMappingHandlerAdapter
        也就提供对json格式支持
     -->
    <mvc:annotation-driven/>
    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

beans.xml(Spring的配置)

<?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:mvc="http://www.springframework.org/schema/mvc"
    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-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
        
        <context:component-scan base-package="com.zhao"></context:component-scan>
        
    <!-- 第一步：配置数据源 -->
    <context:property-placeholder location="classpath:jdbc.properties" />
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>

    </bean>

    <!-- 第二步：创建sqlSessionFactory。生产sqlSession -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
    </bean>
    <!-- 配置mybatis接口代理开发
        * 接口类名和映射文件必须同名
        *　接口类和映射文件必须在同一个目录　下
        * 映射文件namespace名字必须是接口的全类路径名
        *　接口的方法名必须和映射Statement的ｉｄ一致
     -->
     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
     <property name="basePackage" value="com.zhao.mapper"></property>
     <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
     </bean>
    

    <!-- 第三步：事务 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!-- 配置通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
    <tx:method name="save*" propagation="REQUIRED" />
    <tx:method name="update*" propagation="REQUIRED" />
    <tx:method name="delete*" propagation="REQUIRED" />
    <tx:method name="insert*" propagation="REQUIRED" />
    <tx:method name="*" propagation="REQUIRED" />   
    </tx:attributes>
    
    </tx:advice>
    
    <!-- 配置拦截service -->
    <aop:config>
    <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.zhao.service.*.*(..))"/>
    </aop:config>
    
</beans>

jdbc.properties(数据库jdbc的配置)

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc\:mysql\://localhost\:8888/blog
jdbc.username=root
jdbc.password=123456

web.xml的配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:beans.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <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>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

spring的配置中已经添加了对数据源的支持。。在基础的应用中我们并不需要对MyBatis做什么配置。因此基本的配置就是如上所示。

增删改查的操作

首先是查的操作

列表显示所有信息

Controller层实现

    @RequestMapping("/list")
    public String UserList(Model model) {
        
        List<User> list =userService.findAll();
        //传递数据至前端
        model.addAttribute("list",list);
        //返回对应视图
        return  "itemsList";
    }

对应的Service实现层

    @Override
    public List<User> findAll() {
        UserExample example = new UserExample();
        List<User> list=    userMapper.selectByExample(example);
        return list;
    }

前端页面实现细节

<table width="100%" border=1>
<tr>
    <td>ID</td>
    <td>用户名</td>
    <td>密码</td>
    <td>昵称</td>
    <td>电子邮箱</td>
    <td>操作</td>
</tr>
<c:forEach items="${list}" var="item">
<tr>
    <td>
    <input type="checkbox" name="iduser" value="${item.iduser}">
    </td>
    <td>${item.username }</td>
    <td>${item.password }</td>
    <td>${item.nickname }</td>
    <td>${item.email }</td>
    <td><a href="${pageContext.request.contextPath }/user/edit?iduser=${item.iduser}">修改</a>
    <a href="${pageContext.request.contextPath }/user/deleteByID?iduser=${item.iduser}">删除</a>
    </td>

</tr>
</c:forEach>

根据id修改相应的数据

Controller层实现

    @RequestMapping("/edit")
    public String Edit(Integer iduser,Model model)
    {
        User user=userService.findById(iduser);
        model.addAttribute("item",user);
        return "editItem";
    }

Service实现层实现

    @RequestMapping("/edit")
    public String Edit(Integer iduser,Model model)
    {
        User user=userService.findById(iduser);
        //将要修改的值传递到前端
        model.addAttribute("item",user);
        return "editItem";
    }
    @RequestMapping(value ="/saveOrUpdate",method = RequestMethod.POST)
    public String saveOrUpdate(User user)
    {
        //保存修改的值
        userService.update(user);
        //跳转到对应的list路由
        return "redirect:list";
    }

前端页面实现

<form id="itemForm" action="${pageContext.request.contextPath }/user/saveOrUpdate" method="post">
<input type="hidden" name="iduser" value="${item.iduser }"/>
修改商品信息：
<table width="100%" border=1>
<tr>
    <td>用户名称</td>
    <td><input type="text" name="username" value="${item.username }"/></td>
</tr>
<tr>
    <td>密码</td>
    <td><input type="text" name="password" value="${item.password}"/></td>
</tr>
<tr>
    <td>昵称</td>
    <td><input type="text" name="nickname"  value="${item.nickname}"/></td>
</tr>
<tr>
    <td>email</td>
    <td><input type="text" name="email"  value="${item.email}"/></td>
</tr>

<tr>
<td colspan="2" align="center"><input type="submit" value="提交"/>
</td>
</tr>
</table>

</form>

上述流程并未对是否查询成功做对应处理。有兴趣的同学可以尝试将其补充完整

根据id删除对应的数据

Controller层实现

    @RequestMapping("/deleteByID")
    public String deleteByID(Integer iduser)
    {
        
        userService.deleteById(iduser);
        return "redirect:list";
    }

Service实现层实现

    @Override
    public void deleteById(Integer iduser) {
        // TODO Auto-generated method stub
        userMapper.deleteByPrimaryKey(iduser);
    }

前端页面上需要做的修改。已经在上述列表页面展示过了。在此不再赘述。

新增数据

Controller层实现

    //超链接到对应的页面
    @RequestMapping("/add")
    public String Add()
    {
        return "AddUser";
    }
    //保存数据到数据库后跳转到列表页面
    @RequestMapping("/addUser")
    public String Insert(User user)
    {
        userService.insert(user);
        return "redirect:list";
    }

Service实现层实现

    @Override
    public void insert(User user) {
        userMapper.insert(user);

    }

前端页面实现

<form id="itemForm" action="${pageContext.request.contextPath }/user/addUser" method="post">
商品信息：
<table width="100%" border=1>
<tr>
    <td>用户名称</td>
    <td><input type="text" name="username"/></td>
</tr>
<tr>
    <td>密码</td>
    <td><input type="text" name="password"/></td>
</tr>
<tr>
    <td>昵称</td>
    <td><input type="text" name="nickname"  /></td>
</tr>
<tr>
    <td>email</td>
    <td><input type="text" name="email"/></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="提交"/>
</td>
</tr>
</table>

</form>

以上就是一个完整的增删改查的全部过程。已上传到github.有需要的同学可以下载查看。有什么问题可以与我交流喜欢的同学也不妨点一下喜欢