mybatis系列三：springMVC和mybatis的运用

mybatis系列：

mybatis系列一:mybatis实现增删改查:

http://blog.csdn.net/wanlong360599336/article/details/71172060

mybatis系列二：Spring与MyBatis的整合实例:

http://blog.csdn.net/wanlong360599336/article/details/71194238

1.效果：

2.结构图：

3.看上面的结构图，重点的在于配置文件：

新建controller页面：

package com.mybatis.controller; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.mybatis.interfaces.*; import com.mybatis.model.*; @Controller @RequestMapping("/article") public class UserController { @Autowired IUserOperation userMapper; @RequestMapping("/list") public ModelAndView listall(HttpServletRequest request,HttpServletResponse response){ List<Article> articles=userMapper.getUserArticles(24); ModelAndView mav=new ModelAndView("main"); mav.addObject("articles",articles); return mav; } }

配置文件如下

applicationContext.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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd" default-autowire="byName" default-lazy-init="false"> <!--本示例采用DBCP连接池，应预先把DBCP的jar包复制到工程的lib目录下。 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" p:driverClassName="com.mysql.jdbc.Driver" p:url="jdbc:mysql://127.0.0.1:3306/mybatis?characterEncoding=utf8" p:username="root" p:password="password" p:maxActive="10" p:maxIdle="10"> </bean> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--dataSource属性指定要用到的连接池--> <property name="dataSource" ref="dataSource"/> <!--configLocation属性指定mybatis的核心配置文件--> <property name="configLocation" value="classpath:config/Configuration.xml" /> <!-- 所有配置的mapper文件 --> <property name="mapperLocations" value="classpath*:com/mybatis/mapper/*.xml" /> </bean> <!-- MapperScannerConfigurer 去扫描所有的mapper接口 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.mybatis.interfaces" /> </bean> <!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> <property name="mapperInterface" value="com.yihaomen.inter.IUserOperation" /> </bean> --> </beans> Configuration.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> <!-- mybatis别名定义 --> <typeAliases> <typeAlias alias="User" type="com.mybatis.model.User" /> <typeAlias alias="Article" type="com.mybatis.model.Article" /> </typeAliases> <!-- 与spring 集成之后,这些可以完全删除,数据库连接的管理交给 spring 去管理 --> <!-- <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis" /> <property name="username" value="root" /> <property name="password" value="password" /> </dataSource> </environment> </environments> --> <!-- 这里交给sqlSessionFactory 的 mapperLocations属性去得到所有配置信息 --> <!-- <mappers> <mapper resource="com/mybatis/mapper/User.xml" /> </mappers> --> </configuration> <!-- Ctrl+Shift+F 自动排版 -->

mvc-dispatcher-servlet.xml：

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <context:component-scan base-package="com.mybatis.controller" /> <mvc:annotation-driven /> <mvc:resources mapping="/static/**" location="/WEB-INF/static/"/> <mvc:default-servlet-handler/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"> <value>/WEB-INF/pages/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean> </beans>

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>MyBatisStudys</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>encodingFilter</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>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:config/applicationContext.xml</param-value><!-- 加载配置文件applicationContext.xml --> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class> org.springframework.web.context.ContextCleanupListener</listener-class> </listener> <servlet> <servlet-name>mvc-dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>mvc-dispatcher</servlet-name> <!--这里的servlet-name的值要和 mvc-dispatcher-servlet.xml的名称一致 --> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> 新建一个页面：

main.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!-- "http://java.sun.com/jsp/jstl/core"需添加jstl.jar和standard.jar两个jar包，否则报错 --> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>article list</title> </head> <body> <c:forEach items="${articles}" var="item"> ${item.id }--${item.title }--${item.content }<br /> </c:forEach> </body> </html> 访问页面：

http://localhost:8080/MyBatisStudys/article/list

下载地址：   springMVC和Mybatis实例

在这里，springMVC配置的过程要注意一个细节，不然很容易报这种错误，例如 ：  java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for ************

这次我就遇到了，原来是我的接口名和mapper里面的user.xml中定义的方法名称不一致导致的，所以要注意，网上有这种问题的几种解决方法：

按照步骤进行逐一检查： 1、mapper.xml中没有加入namespace  2、mapper.xml中的方法和接口mapper的方法不对应  3、mapper.xml没有加入到mybatis-config.xml中(即总的配置文件)，例外：配置了mapper文件的包路径的除外  4、mapper.xml文件名和所写的mapper名称不相同。