springmvc整合mybatis

导入所需要的jar包

• spring的jar包
• mybatis的jar包
  • mybatis-3.4.5.jar
  • mybatis-spring-1.3.1.jar
• springmvc的jar包
  • spring-webmvc-5.0.0.RELEASE.jar

配置mybatis: mybatis.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
  <!--可以在这里配置别名-->
</configuration>

配置spring dao层: spring-dao.xml

db.properties:

jdbcUrl=jdbc:mysql://localhost:3306/test
driverClass=com.mysql.jdbc.Driver
user=root
password=root
minPoolSize=5 
maxPoolSize=30
initialPoolSize=10
maxIdleTime=60
acquireIncrement=5
idleConnectionTestPeriod=60
acquireRetryAttempts=30

spring-dao.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/util 
    http://www.springframework.org/schema/util/spring-util.xsd">

    <!-- 加载配置文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="${driverClass}"/>
        <property name="jdbcUrl" value="${jdbcUrl}"/>
        <property name="user" value="${user}"/>
        <property name="password" value="${password}"/>
        <!--连接池中保留的最小连接数。-->
        <property name="minPoolSize" value="${minPoolSize}"/>
        <!--连接池中保留的最大连接数。Default: 15 -->
        <property name="maxPoolSize" value="${maxPoolSize}"/>
        <!--初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3 -->
        <property name="initialPoolSize" value="${initialPoolSize}"/>
        <!--最大空闲时间,maxIdleTime秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->
        <property name="maxIdleTime" value="${maxIdleTime}"/>
        <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 -->
        <property name="acquireIncrement" value="${acquireIncrement}"/>
        <!--每60秒检查所有连接池中的空闲连接。Default: 0 --> 
        <property name="idleConnectionTestPeriod" value="${idleConnectionTestPeriod}"/>
        <!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 -->
        <property name="acquireRetryAttempts" value="${acquireRetryAttempts}"/>
    </bean>
    
    <!-- SQLSessionFactory的配置 -->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis/Configuration.xml"/>
        <!-- 扫描domain包 使用别名 -->
        <property name="typeAliasesPackage" value="com.gongxm.domain"/>
    </bean>
    <!-- mapper代理形式dao的配置 -->
    <!-- 配置包扫描器 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.gongxm.mapper"/>
    </bean>

</beans>

配置service层: spring-service.xml

spring-service.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/util 
    http://www.springframework.org/schema/util/spring-util.xsd">

    <!-- 配置包扫描器 -->
    <context:component-scan base-package="com.gongxm.service"/>
    
</beans>

配置事务层: spring-tx.xml

spring-tx.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/util 
    http://www.springframework.org/schema/util/spring-util.xsd">
    
    <!-- 事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 指定数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
    <!-- 通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    
    <!-- 切面 -->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.gongxm.service.*.*(..))"/>
    </aop:config>
    
</beans>

配置springmvc: springmvc.xml

springmvc.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/util 
    http://www.springframework.org/schema/util/spring-util.xsd">

    <!-- 配置包扫描器,扫描controller -->
    <context:component-scan base-package="com.gongxm.controller"/>
    
    <!-- 配置注解驱动, 配置了这个就不用配置处理器和适配器了 -->
    <mvc:annotation-driven/>
    
    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

配置web.xml

web.xml:

<?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/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>springmvc-mybatis</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>
    
    <!-- 初始化spring容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/spring-*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoader</listener-class>
    </listener>
    
    <!-- 配置前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <!-- 指定springmvc的配置文件位置 -->
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>

</web-app>

数据绑定

• springmvc默认支持的数据类型: 请求可以直接使用的对象, 以及返回的类型

    @RequestMapping("/itemEdit") //方法中的这些参数都是由框架传递, 需要使用哪个就定义哪个
    public String editItem(HttpServletRequest request, 
            HttpServletResponse response, HttpSession session, Model model) {
        //从request中取参数
        String strId = request.getParameter("id");
        int id = new Integer(strId);
        //调用服务
        Items items = itemService.getItemById(id);
        //把结果传递给页面
        //ModelAndView modelAndView = new ModelAndView();
        //modelAndView.addObject("item", items);
        //设置逻辑视图
        //modelAndView.setViewName("editItem");
        //return modelAndView;
        //设置返回结果
        model.addAttribute("item", items);
        //返回逻辑视图
        return "editItem";
    }

• 简单类型的数据绑定

    // 直接写Integer id就可以接收到客户端发送过来的id参数, 
    //不过方法上的参数名必须要与客户端的参数名相同!
    @RequestMapping("/itemEdit") 
    public String editItem(Integer id, Model model) {
        Items items = itemService.getItemById(id);
        //把数据传递给页面
        model.addAttribute("item", items);
        //返回逻辑视图
        return "editItem";
    }

• 当请求参数名称与方法参数名称不一致时, 可以使用注解进行映射:

    @RequestMapping("/itemEdit")
    public String editItem(@RequestParam(value="id",defaultValue="1",required=true)Integer ids, Model model) {
        Items items = itemService.getItemById(ids);
        //把数据传递给页面
        model.addAttribute("item", items);
        //返回逻辑视图
        return "editItem";
    }

@RequestParam(value="id",defaultValue="1",required=true)Integer ids
意思是把请求参数中的id映射到ids上, 如果没有该参数, 可以使用默认值: defaultValue="1"
required=true的意思是该参数必须要有值

• 当需要接收一个pojo类型的参数时, 要求表单中的name属性与pojo的属性名相同!

    @RequestMapping("/updateitem")
    public String updateItem(Items items) {
        itemService.updateItem(items);
        //返回成功页面
        return "success";
    }

• 绑定包装pojo
  包装对象定义如下：

Public class QueryVo {
  private Items items;
}

页面定义：

<input type="text" name="items.name" />
<input type="text" name="items.price" />

Controller方法定义如下：

    @RequestMapping("/queryitem")
    public String queryItem(QueryVo queryVo) {
        //打印绑定结果
        System.out.println(queryVo.getItems().getId());
        System.out.println(queryVo.getItems().getName());
        return "success";
    }

• 自定义参数绑定
  自定义Converter

public class DateConverter implements Converter<String, Date> {

    @Override
    public Date convert(String source) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            return simpleDateFormat.parse(source);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }
}

配置Converter

    <!-- 加载注解驱动 -->
    <mvc:annotation-driven conversion-service="conversionService"/>
    <!-- 转换器配置 -->
    <bean id="conversionService"
        class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.gongxm.convert.DateConverter"/>
            </set>
        </property>
    </bean>

配置方式2（了解）

<!-- 转换器配置 -->
    <bean id="conversionService"
        class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.gongxm.convert.DateConverter"/>
            </set>
        </property>
    </bean>
    <!-- 自定义webBinder -->
    <bean id="customBinder" class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
        <property name="conversionService" ref="conversionService" />
    </bean>
    <!--注解适配器 -->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
         <property name="webBindingInitializer" ref="customBinder"></property> 
    </bean>
    <!-- 注解处理器映射器 -->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

解决POST乱码的问题

在web.xml文件中加入以下内容:

    <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>