//本文章参看BliBli学习总结，感谢提供视频的北京动力节点，本文章仅分享供大家参考学习，没有商业用途，谢谢！

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);
        }
    }
}