IDEA使用Maven和MyBatis简化数据库连接的详细过程

<dependencies>
<!--mybatis核心包--> 
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<!--mysql驱动包-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<!-- 单元测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
<!-- 日志 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>

private int id;
    private String name;
    private int age;
    private String sex;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    //toString方法
    @Override
    public String toString() {
        return "students{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                '}';
    }

package com.newFile.dao;
//引入students包
import com.newFile.entity.students;
//引入list
import java.util.List;
public interface StudentDao {
    //定义findAll方法查找所有内容
    public List<students> findAll();
}

<?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.newFile.dao.StudentDao"></mapper>

<?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>
    <environments default="mysql">
        <environment id="mysql">
            <!--配置事务的类型，使用本地事务策略-->
            <transactionManager type="JDBC"></transactionManager>
            <!--是否使用连接池 POOLED表示使用链接池，UNPOOLED表示不使用连接池-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <!--student为数据库名-->
                <property name="url" value="jdbc:mysql://localhost:3306/newtest"/>
                <!--这里写你mysql数据库的用户名和密码-->
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--实现类的路径-->
        <mapper resource="mapper/StudentDao.xml"></mapper>
    </mappers>
</configuration>

<select id="findAll" resultType="com.newFile.entity.students">
    select * from student
</select>

    public void run() throws IOException {
        //主配置文件路径
        String resourcePath = "SqlMapConfig.xml";
        //加载主配置文件，为了拿到SqlSessionFactory
        InputStream inputStream = Resources.getResourceAsStream(resourcePath);
        //拿到SqlSessionFactory对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //创建SqlSession
        SqlSession session = sqlSessionFactory.openSession();
        //通过SqlSession对象创建studentDao接口的代理对象
        studentDao mapper = session.getMapper(studentDao.class);
        //通过代理访问接口中的方法
        List<students> arr = mapper.findAll();
        //打印输出
        for(students student : arr){
            System.out.println(student);
        }
    }

Test test = new Test();test.run();