mybatis系列三:springMVC和mybatis的运用
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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 {@AutowiredIUserOperation 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/> <beanclass="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。
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。
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