Java教程
Spring整合Mybatis实例
本文主要是介绍Spring整合Mybatis实例，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
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Spring整合mybatis
1、创建数据库springdb，新建表Student
2、新建maven项目，选maven-archetype-quickstart
Groupid:com.bjpowernode
3、删除默认创建的App类文件以及AppTest测试文件<不删也可以>
4、pom.xml文件中加入依赖
<?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>com.bjpowernode</groupId>
<artifactId>spring_mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<name>spring_mybatis</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!--单元测试-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!--Spring核心ioc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!--做spring事务用到的-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.1</version>
</dependency>
<!--mybatis和spring集成的依赖，由mybatis提供-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!--mybatis驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.9</version>
</dependency>
<!--阿里公司数据库连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.12</version>
</dependency>
</dependencies>
<build>
<!--目的是把src/main/java目录中的xml文件包含到输出结果中。输出到classes目录中-->
<resources>
<resource>
<directory>src/main/java</directory><!--所在的目录-->
<includes><!--包括目录下的.properties,.xml 文件都会扫描到-->
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
<!--指定jdk的版本-->
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
5、新建domain包并定义实体类Student.java
package com.bjpowernode.domain;
public class Student {
//属性名和列名一样。
private Integer id;
private String name;
private String email;
private Integer age;
public Student() {
}
public Student(Integer id, String name, String email, Integer age) {
this.id = id;
this.name = name;
this.email = email;
this.age = age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", email='" + email + '\'' +
", age=" + age +
'}';
}
}
6、新建dao包并定义StudentDao.java接口
package com.bjpowernode.dao;
import com.bjpowernode.domain.Student;
import java.util.List;
public interface StudentDao {
int insertStudent(Student student);
List<Student> selectStudents();
}
7、在dao包中定义映射文件StudentDao.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">
<mapper namespace="com.bjpowernode.dao.StudentDao">
<insert id="insertStudent">
insert into student values(#{id},#{name},#{email},#{age})
</insert>
<select id="selectStudents" resultType="Student">
select id,name,email,age from student order by id desc
</select>
</mapper>
8、新建service包并定义Service.java接口和ServiceImpl.java实现类
package com.bjpowernode.service;
import com.bjpowernode.domain.Student;
import java.util.List;
public interface StudentService {
int addStudent(Student student);
List<Student> queryStudents();
}
package com.bjpowernode.service.impl;
import com.bjpowernode.dao.StudentDao;
import com.bjpowernode.domain.Student;
import com.bjpowernode.service.StudentService;
import java.util.List;
public class StudentServiceImpl implements StudentService {
//引用类型
private StudentDao studentDao;
//使用set注入，赋值
public void setStudentDao(StudentDao studentDao) {
this.studentDao = studentDao;
}
@Override
public int addStudent(Student student) {
int nums = studentDao.insertStudent(student);
return nums;
}
@Override
public List<Student> queryStudents() {
List<Student> students = studentDao.selectStudents();
return students;
}
}
9、main文件夹下新建resources包，并标记为Resources根并定义Mybatis.xml主配置文件
<?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>
<!--settings：控制mybatis全局行为-->
<settings>
<!--设置mybatis输出日志-->
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
<!--设置别名-->
<typeAliases>
<!--name:实体类所在的包名
表示com.bjpowernode.domain包中的列名就是别名
你可以使用student表示com.bjpowenrode.domain.Student
-->
<package name="com.bjpowernode.domain"/>
</typeAliases>
<!-- sql mapper(sql映射文件)的位置-->
<mappers>
<!--
name：是包名， 这个包中的所有mapper.xml一次都能加载
-->
<package name="com.bjpowernode.dao"/>
</mappers>
</configuration>
10、resources包下新建applicationContext.xml Spring配置文件
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--
把数据库的配置信息，写在一个独立的文件，编译修改数据库的配置内容
spring知道jdbc.properties文件的位置
-->
<context:property-placeholder location="classpath:jdbc.properties" />
<!--声明数据源DataSource, 作用是连接数据库的-->
<bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<!--set注入给DruidDataSource提供连接数据库信息 -->
<!-- 使用属性配置文件中的数据，语法 ${key} -->
<property name="url" value="${jdbc.url}" /><!--setUrl()-->
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.passwd}" />
<property name="maxActive" value="${jdbc.max}" />
</bean>
<!--声明的是mybatis中提供的SqlSessionFactoryBean类，这个类内部创建SqlSessionFactory的
SqlSessionFactory sqlSessionFactory = new ..
-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--set注入，把数据库连接池付给了dataSource属性-->
<property name="dataSource" ref="myDataSource" />
<!--mybatis主配置文件的位置
configLocation属性是Resource类型，读取配置文件
它的赋值，使用value，指定文件的路径，使用classpath:表示文件的位置
-->
<property name="configLocation" value="classpath:mybatis.xml" />
</bean>
<!--创建dao对象，使用SqlSession的getMapper（StudentDao.class）
MapperScannerConfigurer:在内部调用getMapper()生成每个dao接口的代理对象。
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--指定SqlSessionFactory对象的id-->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<!--指定包名， 包名是dao接口所在的包名。
MapperScannerConfigurer会扫描这个包中的所有接口，把每个接口都执行
一次getMapper()方法，得到每个接口的dao对象。
创建好的dao对象放入到spring的容器中的。 dao对象的默认名称是 接口名首字母小写
-->
<property name="basePackage" value="com.bjpowernode.dao"/>
</bean>
<!--声明service-->
<bean id="studentService" class="com.bjpowernode.service.impl.StudentServiceImpl">
<property name="studentDao" ref="studentDao" />
</bean>
</beans>
10、新建jdbc.properties文件
jdbc.url=jdbc:mysql://localhost:3306/springdb jdbc.username=root jdbc.passwd=root jdbc.max=30
11、test/ java/com/bjpowernode下新建测试类MyTest.java
package com.bjpowernode;
import com.bjpowernode.dao.StudentDao;
import com.bjpowernode.domain.Student;
import com.bjpowernode.service.StudentService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class MyTest {
@Test
public void test01(){
String config="applicationContext.xml";
ApplicationContext ctx = new ClassPathXmlApplicationContext(config);
String names[] = ctx.getBeanDefinitionNames();
for(String na:names){
System.out.println("容器中对象名称："+na+"|"+ctx.getBean(na));
}
}
@Test
public void testDaoInsert(){
String config="applicationContext.xml";
ApplicationContext ctx = new ClassPathXmlApplicationContext(config);
//获取spring容器中的dao对象
StudentDao dao = (StudentDao) ctx.getBean("studentDao");
Student student = new Student();
student.setId(1013);
student.setName("周锋");
student.setEmail("zhoufeng@qq.com");
student.setAge(20);
int nums = dao.insertStudent(student);
System.out.println("nums="+nums);
}
@Test
public void testServiceInsert(){
String config="applicationContext.xml";
ApplicationContext ctx = new ClassPathXmlApplicationContext(config);
//获取spring容器中的dao对象
StudentService service = (StudentService) ctx.getBean("studentService");
Student student = new Student();
student.setId(1015);
student.setName("李胜利");
student.setEmail("zhoufeng@qq.com");
student.setAge(26);
int nums = service.addStudent(student);
//spring和mybatis整合在一起使用，事务是自动提交的。 无需执行SqlSession.commit();
System.out.println("nums="+nums);
}
@Test
public void testServiceSelect(){
String config="applicationContext.xml";
ApplicationContext ctx = new ClassPathXmlApplicationContext(config);
//获取spring容器中的dao对象
StudentService service = (StudentService) ctx.getBean("studentService");
List<Student> students = service.queryStudents();
for (Student stu:students){
System.out.println(stu);
}
}
}
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