Java——Spring整合Mybatis（IDEA版）
本文适用于初学者：
该文主要教大家如何整合spring和mybatis，整合完成效果，可以从数据库中查询出学生信息：
完整的工程目录如下：
整合思路：
- 需要spring来管理数据源信息。
- 需要spring通过单例方式管理SqlSessionFactory。
- 使用SqlSessionFactory创建SqlSession。（spring和mybatis整合自动完成）
- 持久层的mapper都需要由spring进行管理，spring和mybatis整合生成mapper代理对象。
下面开始工程搭建：
第一步：创建工程 File—New—Project
点击Finish完成
注意：项目创建完成会有如下图提示：
这里是问你是否要自动导入，选择Enable即可，maven便会自动帮你导入jar包
第二步：项目准备
本项目需要用到mysql数据库，首先先在mysql中创建一个数据库，然后创建一张表，sql语句如下：
CREATE DATABASE /*!32312 IF NOT EXISTS*/`test` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `test`;
/*Table structure for table `student` */
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`id` int(11) DEFAULT NULL,
`username` varchar(20) DEFAULT NULL,
`password` varchar(20) DEFAULT NULL,
`email` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*Data for the table `student` */
insert into `student`(`id`,`username`,`password`,`email`) values
(1,'jack','123','123@jack'),
(2,'rose','520','rose@123');
第三步：正式开发
1.修改pom文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.grandage</groupId>
<artifactId>SpringMybatisTest</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<!-- spring版本号 -->
<spring.version>4.1.6.RELEASE</spring.version>
<!-- mybatis版本号 -->
<mybatis.version>3.2.6</mybatis.version>
<!-- log4j日志文件管理包版本 -->
<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!-- 表示开发的时候引入，发布的时候不会加载此包 -->
<scope>test</scope>
</dependency>
<!-- spring核心包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- mybatis/spring包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<!-- 导入java ee jar 包 -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<!-- 导入Mysql数据库链接jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
<!-- c3p0连接池jar -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!-- JSTL标签类 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 日志文件管理包 -->
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<!-- 格式化对象，方便输出日志 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- log end -->
<!-- 映入JSON -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<!-- 上传组件包 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
</dependencies>
</project>
2.新建实体类Student：
package cn.grandage.pojo;
public class Student {
private Integer id;
private String username;
private String password;
private String email;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "StudentMapper{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", email='" + email + '\'' +
'}';
}
}
3.新建db.properties文件
配置文件放在resources目录下
db.driver=com.mysql.jdbc.Driver
#数据库连接字符串(改成自己的连接)
db.url=jdbc:mysql://localhost:3306/test
#数据库用户名(这里改成自己的用户名)
db.username=root
#数据库密码(这里改成自己的密码)
db.password=123456
4.新建StudentMapper接口
package cn.grandage.mapper;
import cn.grandage.pojo.Student;
public interface StudentMapper {
public Student findStudentById(int id);
}
5.新建mybatis映射配置文件：Student.xml
<?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">
<!-- namespace：命名空间，对sql进行一个分类管理 -->
<!-- 注意：namespace在mapper代理时，具有重要且特殊的作用
对应mapper接口的全限定名
-->
<!--mybatis映射配置文件-->
<mapper namespace="cn.grandage.mapper.StudentMapper">
<select id="findStudentById" parameterType="int" resultType="student">
select * from student where id=#{id}
</select>
</mapper>
6.新建mybatis核心配置文件：SqlMapConfig.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核心配置文件-->
<!--给类取别名，简化输入，方便映射配置文件中使用-->
<typeAliases>
<typeAlias type="cn.grandage.pojo.Student" alias="student"/>
</typeAliases>
<!--加载mapper映射配置文件-->
<mappers>
<mapper resource="Student.xml"/>
</mappers>
</configuration>
7.新建spring核心配置文件(applicationContext.xml)，并整合mybatis：
<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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<!--引入java配置文件-->
<context:property-placeholder location="db.properties"/>
<!--配置数据源-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="${db.driver}" />
<property name="url" value="${db.url}"/>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="maxActive" value="10"/>
<property name="maxIdle" value="5"/>
</bean>
<!--配置sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--指定Mybatis全局配置文件-->
<property name="configLocation" value="classpath:SqlMapConfig.xml"/>
<!--指定数据源-->
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="studentMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<!--指定要映射的mapper接口的全限定名-->
<property name="mapperInterface" value="cn.grandage.mapper.StudentMapper"/>
<!--指定sqlSessionFactory-->
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>
8.测试类编写：
import cn.grandage.mapper.StudentMapper;
import cn.grandage.pojo.Student;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test01 {
@Test
public void test01() {
//获取applicationContext文件并加载
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
//获取StudentDao的bean
StudentMapper sd = (StudentMapper) ac.getBean("studentMapper");
Student s = sd.findStudentById(1);
System.out.println("学生姓名：" + s.getUsername());
System.out.println("学生密码：" + s.getPassword());
System.out.println("学生邮箱：" + s.getEmail());
}
}
测试结果：
身体和灵魂都要在路上
