springmv+mybatis整合以及遇到的问题

其实网上已经有不少文章描述sm整合，但个人感觉，它们或多或少有些细节没有交代清楚吧，本篇文章就是针对这些细节来进行详解~

首先是项目结构图：

 

WebContent目录结构图:

 

User类：

 

 

UserMapper以及映射文件：

 

 

其中id需要与UserMapper的方法名一致，返回类型resultType以及参数类型parameterType无需多说，需要注意的是findUsers方法，在映射文件中声明了返回

类型是User,而UserMapper返回的是list<User>，实际上这是支持的。

接口IUserService以及它的实现类：

 

package com.lee.sm.serviceImpl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.lee.sm.mapper.UserMapper;
import com.lee.sm.pojo.User;

//默认将类中的所有函数纳入事务管理.   
//@Transactional("user")
@Service("iUserServiceImpl")
@Transactional
public class IUserServiceImpl implements IUserService {

 @Autowired
 private UserMapper userMapper;
 
 /**
  * 检查用户登录密码
  * */
 @Override
 public boolean authUser(User user) {
  String passWord = userMapper.showPassword(user);
  if(passWord != null && user.getPassword() != null && passWord.equals(user.getPassword())){
   return true;
  }
  return false;
 }

 @Override
 public String showUserList() {
   List<User> users = userMapper.findUsers();
   for(User user : users){
    System.out.println(user);
   }
   return "测试完毕";
 }

 @Override
 public String showStory(User user) {
  String userStory = "";
  userStory = userStory + "address=[" + userMapper.showAddress(user) + "]";
  return userStory;
 }

 @Override
 public String createUser(User user) throws RuntimeException{
  userMapper.insertUser(user);
  System.out.println("准备抛出异常");
  //在插入成功后，抛出一个异常，测试事物是否回滚
  try {
   int i = 1/0;
  } catch (Exception e) {
   throw new RuntimeException();  
  }
  return null;
 }

 public UserMapper getUserMapper() {
  return userMapper;
 }

 public void setUserMapper(UserMapper userMapper) {
  this.userMapper = userMapper;
 }
 
 
}

原本不是@Service("iUserServiceImpl")而是@Service这样注解的，结果在创建LoginController时报错说，自动注入IUserService时找不到这个bean，

话说@Service不是自动注册为首字母小写的bean吗？....求大神指点......

页面跳转的控制器LoginController：

package com.lee.sm.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.lee.sm.pojo.User;
import com.lee.sm.serviceImpl.IUserService;

@Controller
@RequestMapping("/mine")
public class LoginController {
	
	@Autowired
	@Qualifier("iUserServiceImpl")
	private IUserService iUserService;
	
	@RequestMapping
	public String mine(){
		System.out.println("in the mine()...");
		User user = new User();
		user.setName("003");
		String mineStory = iUserService.showStory(user);
		System.out.println(mineStory);
		return "main2";
	}
	
	@RequestMapping(value="/findFriends")
	public String findFriends() {
		System.out.println("in the findFriends()");
		System.out.println(iUserService.showUserList());
		User user = new User("阿诺", "40", "美国加州", 1, "123");
		iUserService.createUser(user);
		System.out.println("已插入新建用户");
		
		
		return "main2";
	}

	public IUserService getiUserService() {
		return iUserService;
	}

	public void setiUserService(IUserService iUserService) {
		this.iUserService = iUserService;
	}
	
	
	
}

 

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>MySpringMVCMybatis</display-name>
  
  <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:config/applicationContext.xml</param-value>
  </context-param>
  
  <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!-- spring提供转码 -->
 <filter>
        <filter-name>characterEncoding</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>characterEncoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
  <servlet>
        <servlet-name>woder</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>woder</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
  
  
</web-app>

 

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:cxt="http://www.springframework.org/schema/context" 
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-2.5.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

 <!-- 注释此项，因为后面已使用cxt:component-scan -->
    <!-- <cxt:annotation-config /> -->
     
    <cxt:component-scan base-package="com.lee.sm.serviceImpl">           
  <!-- <cxt:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> -->
 </cxt:component-scan>
 
    
    <bean id="propertyConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
    <property name="locations">  
             <list>  
                 <value>classpath:config/jdbc.properties</value>  
             </list>  
    </property>  
    </bean>
    
    
 <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
    </bean>

    
     <!-- define the SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="myDataSource" />
         <property name="configLocation" value="classpath:config/mybatis-config.xml"/> 
    </bean>
    
 
 <!-- 开启事务注解驱动 -->  
 <tx:annotation-driven />
 
 
  <!-- Transaction Manager -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="myDataSource" />
  <!-- 如果是user表，用@Transactional("user")，如果是smis用 @Transactional("smis")管理事务-->
  </bean>
    
    
    <!-- scan for mappers and let them be autowired -->
    <!-- 使用自动扫描包的方式来注册各种mapper -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lee.sm.mapper" />
    </bean>
    
</beans>

 

 

woder-servlet.xml，相当于另一些文章说的sprigmvc-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:mvc="http://www.springframework.org/schema/mvc" 
xmlns:cxt="http://www.springframework.org/schema/context" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd ">
	
	<!-- 启动包扫描功能，以便注册带有@Controller、@Service、@repository、@Component等注解的类成为spring的bean -->
	<cxt:component-scan base-package="com.lee.sm.controller">
		<!-- <cxt:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/> -->
	</cxt:component-scan>
	
	<!--  主要作用于@Controller，激活该模式，下面是一种简写形式，完全可以手动配置替代这种简写形式，它会自动注册DefaultAnnotationHandlerMapping与AnnotationMethodHandlerAdapter，是spring MVC为@Controllers分发请求所必须的   -->
	<mvc:annotation-driven/>
	
	
	
	<!-- 对模型视图名称的解析，在请求时模型视图名称添加前后缀 -->
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<!-- <property name="cache" value="true"/> -->
		
		<!-- viewClass属性可以用来指定前台在解析数据时，所允许采用的手段。实际上其默认值就是JstlView --> 
		<!-- 将来有需要的话，就可以在这里把JstlView改成其它的，如FreeMarkerView,VelocityView,TilesView --> 
		<!-- <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> -->
		
		<property name="prefix" value="/WEB-INF/view/"/>
		<property name="suffix" value=".jsp"/>
		<property name="contentType" value="text/html;charset=UTF-8"/>
	</bean>
	
	<!-- <mvc:view-controller path="/" view-name="redirect:view/main.jsp"/> -->
	<mvc:view-controller path="/" view-name="main"/> 
	<!--  <mvc:view-controller path="*.jsp"/>-->
</beans>

 

这里涉及到了mybatis事务无法回滚的问题

      原本我是在woder-servlet.xml中使用<cxt:component-scan base-package="com.lee.sm.**">来加载位于该目录下(包括子目录下的所有)所有标注了注解的类的(比如@Controller/@Service)，结果mybatis无法回滚

      在试过了把@Transactional改成@Transactional(rollbackFor=Exception.class)、查看mysql引擎是否为innodb之后，仍然无效。

      最后是把service和controller分别在applicationContext.xml及woder-servlet.xml中加载，才得以解决——这里不得不吐槽某篇文章，因为实际上applicationContext.xml是先于springmvc-servlet.xml加载的，所以service应该在applicationContext.xml中加载，然后springmvc-servlet.xml再加载controller——

      那篇文章所叙述的刚好相反...我是在好几次构建controller报错找不到对应的bean注入(service这个bean还没创建)我才醒悟的TnT...

mybatis-config.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>
 
 <typeAliases>
  <!-- <package name="com.chenliang.mvc.entity"/> -->
  <typeAlias alias="BaseMapper" type="com.lee.sm.baseMapper.BaseMapper"/>
  <typeAlias alias="UserMapper" type="com.lee.sm.mapper.UserMapper"/>
  <typeAlias type="com.lee.sm.pojo.User" alias="User"/>
 </typeAliases>

  
  <mappers>
    <!-- <mapper class="com.lee.sm.mapper.*"/> -->
    <mapper resource="com/lee/sm/mapper/UserMapper.xml"/>
  </mappers>
  
</configuration>

jdbc.properties：

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/SPRINGMVC?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
jdbc.username=root
jdbc.password=root
jdbc.maxActive=100
jdbc.maxIdle=30
jdbc.maxWait=500
jdbc.defaultAutoCommit=true

这个项目使用的jar包有

mybatis-3.0.6.jar

mybatis-spring-1.0.1-sources.jar

spring-core-3.0.5.RELEASE.jar

spring-webmvc-3.1.1.RELEASE.jar

 

 

 

 

 

评论

1 楼 wlzhz99 2013-04-09  

头两个字母不要一个大写一个小写。。全大写，或者全小写