Mybatis与Spring整合创建Web项目
林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka
本文要实现使用Mybatis+Spring+Mysql实现一个Web项目的整目。在Spring中配置数据源和Mybatis的SqlSessionFactory,然后在Web中的JSP中取得Spring中的bean。通过这个bean来操作Mysql中的表。网上看了好多人有写,但是要么是图没表示清楚,要么是代码没贴完。本文是一个完整的教程,照着做你也可以自己整合!
使用的版本:Mybatis-3.2.8
Spring3.2.9
Mysql5.6
开发环境: Eclipse Java EE Kepler+Win7
一、创建Web项目并导入包
Eclipse中创建一个Web项目,导入如下的包:
这里一定要注意不能少mybatis-spring-1.2.2.jar这个包,这个包是用来联系Spring和Mybatis的,很重要!!
整个工程目录如下:
二、创建库表映射类并配置MyBatis
1、首先在数据库中创建一张表 t_user
use test; DROP TABLE IF EXISTS t_user; create table t_user ( userId int primary key auto_increment, userName VARCHAR(50) not null, userAge int not null );然后插入4条数据:
insert into t_user values(1,‘小王‘,10); insert into t_user values(2,‘红红‘,11); insert into t_user values(3,‘明明‘,12); insert into t_user values(4,‘天天‘,13);查看下结果:
2、表创建好之后便创建其映射类User,位于包com.mucfc.model中
package com.mucfc.model; /** * User映射类 * @author linbingwen * @time 2015.5.15 */ public class User { private Integer userId; private String userName; private int userAge; public Integer getUserId() { return userId; } public void setUserId(Integer userId) { this.userId = userId; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public int getUserAge() { return userAge; } public void setUserAge(int userAge) { this.userAge = userAge; } @Override public String toString() { return "User [userId=" + userId + ", userName=" + userName + ", userAge=" + userAge + "]"; } }
2、映射类创建好之后便创建MyBatis映射文件(即Mapper文件),位于和src同级的conf的mapper包中,文件内容如下:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.mucfc.mapper.UserMapper"> <!-- 查询单条记录 --> <select id="selectUserById" parameterType="int" resultType="User"> select * from t_user where userId = #{userId} </select> </mapper>3、创建映射UserMapper类如下,位于包com.mucfc.mapper中
package com.mucfc.mapper; import com.mucfc.model.User; /** * Mapper映射类 * @author linbingwen * @time 2015.5.15 */ public interface UserMapper { public User selectUserById(int userId); }4、创建操作数据的DAO层
package com.mucfc.dao; import com.mucfc.model.User; /** * DAO接口层 * @author linbingwen * @time 2015.5.15 */ public interface UserDao { /** * 根据用户ID查询用户信息 * @param id * @return */ public User findUserById(int id); }然后是对应的实现层
package com.mucfc.dao; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import com.mucfc.mapper.UserMapper; import com.mucfc.model.User; /** * DAO实现层 * @author linbingwen * @time 2015.5.15 */ @Component public class UserDaoImpl implements UserDao{ @Autowired private UserMapper userMapper; @Override public User findUserById(int id) { User user = userMapper.selectUserById(id); return user; } }
5、在conf里配置Mybatis的配置文件:
MyBatisConf.xmll放在conf里,注意路径
<?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> <!-- 配置映射类的别名 --> <typeAliases> <typeAlias alias="User" type="com.mucfc.model.User"/> </typeAliases> <!-- 配置Mapper文件的路径 --> <mappers> <mapper resource="mapper/UserMapper.xml"/> </mappers> </configuration>
如果不与Spring进行整合的话,此配置文件还需要配置数据源信息,与Spring整合之后数据源就配置在Spring配置文件中,只需要配置映射文件的路径就可以了。
三、配置Spring
1、在WEB-INF里配置Spring的配置文件:
SpringConf.xml放在WEB-INF里,注意路径
<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" 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"> <!-- 配置数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/test" /> <property name="username" value="root" /> <property name="password" value="christmas258@" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- <property name="mapperLocations" value="conf/mapper/UserMapper.xml"/> --> <property name="configLocation" value="conf/MyBatisConf.xml" /> <!-- <property name="typeAliasesPackage" value="com.tiantian.ckeditor.model" /> --> </bean> <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="mapperInterface" value="com.mucfc.mapper.UserMapper" /> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> </bean> <!-- 自动扫描注解的bean --> <context:component-scan base-package="com.mucfc.dao" /> </beans>
2、web.xml中启动Spring
web.xml放在WEB-INF里
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <!-- 配置初始打开的页面 --> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- Spring 容器加载 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/SpringConf.xml</param-value> </context-param> </web-app>
3、读取bean,进行查找
在index.jsp中设置如下:
index.jsp放置在WebContent中
<%@ page import="com.mucfc.dao.UserDao"%> <%@page import="org.springframework.web.context.WebApplicationContext"%> <%@page import="org.springframework.web.context.support.WebApplicationContextUtils"%> <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>Insert title here</title> </head> <body> <center> 欢迎<br/> <% WebApplicationContext wac = WebApplicationContextUtils .getWebApplicationContext(this.getServletContext()); UserDao userDao = (UserDao) wac.getBean("userDaoImpl"); %> <%=userDao.findUserById(1)%><br /> <%=userDao.findUserById(2)%><br /> <%=userDao.findUserById(3)%><br /> <%=userDao.findUserById(4)%><br /> </center> </body> </html>
四、运行
1、以run on server运行
2、浏览器输入:http://localhost:8080/MybatisLearningChapter5/
结果如下:
林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka
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