SPring整合Mybatis方式一

Spring整合Mybatis

需要maven包：

mysql-connector-java 5.1.47，

mybatis 3.5.2，

spring-webmvc 5.2.2.RELEASE，

spring-jdbc 5.2.2.RELEASE，

aspectjweaver 1.8.13

mybatis-spring 2.0.2，

目录:

pom.xml配置：

<?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>org.example</groupId>
    <artifactId>SpringMybatis</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

    </dependencies>
    <!--maven由于他的约定大于配置，我们之后可以能遇到我们写的配置文件，无法被处理或生效问题，解决方案-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
</project>

Mybatis-config.xml配置文件:

因为是spring可以完全掌管Mybatis但把mybatis的一些配置留给Mybatis-config比较好

<?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.hdlf.pojo"/>
    </typeAliases>

    <mappers>
        <mapper resource="com/hdlf/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

UserMapper接口：

package com.hdlf.mapper;

import com.hdlf.pojo.User;

import java.util.List;

public interface UserMapper {
    public List<User> getalluser();
}

UserMapper.xml配置:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hdlf.mapper.UserMapper">
    <select id="getalluser" resultType="User">
        select * from mybatis.user
    </select>
</mapper>

User实体类：

package com.hdlf.pojo;

public class User {
    private int id;
    private String name;
    private String pwd;

    public User() {
    }

    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

重点，spring-config.xml配置：

根据官网上可以找到:

DataSource使用spring的数据源可以替换mybatis的配置，需要使用DriverManagerDataSource

sqlSessionFactory绑定mybatis配置文件，重点可以配合mybatis配置文件，而mybatis配置文件可以关联mappers

SqlSessionTemplate就是常用的sqlsession只是封装了，但需要构造器注入，把sqlSessionFactory绑定的配置注入到里面即可

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--DataSource:使用spring的数据源替换mybatis的配置
    使用spring提供的jdbc：org.springframework.jdbc.datasource
    -->
    <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/mybatis?useSSL=true&amp;UseUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>
    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:Mybatis-config.xml"/>
    </bean>

    <!--SqlSessionTemplate:就是mybatis经常使用的SqlSession-->
    <bean id="SqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入sqlSessionFactory，因为没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>

    <bean id="usermapper" class="com.hdlf.mapper.UserMapperTemplate">
        <property name="SqlSession" ref="SqlSession"></property>

    </bean>
</beans>

UserMapperTemplate实现类:

实现Usermapper的方法，封装SqlSessionTemplate，然后用getalluesr返回mapper.getalluser();所有数据

package com.hdlf.mapper;

import com.hdlf.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperTemplate implements UserMapper {

    private SqlSessionTemplate SqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.SqlSession = sqlSession;
    }

    public List<User> getalluser() {
        UserMapper mapper = SqlSession.getMapper(UserMapper.class);
        return mapper.getalluser();
    }

}

测试类：

不用配置mybatis之类的麻烦的配置

package com.hdlf.test;

import com.hdlf.mapper.UserMapper;
import com.hdlf.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;

public class Mytest {
    public static void main(String[] args) throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");
        UserMapper userMapper = context.getBean("usermapper", UserMapper.class);
        for (User user : userMapper.getalluser()) {
            System.out.println(user);

        }

    }
}

结果：