MyBatis完整环境搭建步骤

  <?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>
    	 <!-- 
    	 	用于指定使用哪个环境
    	 	default:用于指定使用的环境id 
    	 -->
     	<environments default="dev">
     	<!-- 
     		用于配置开发环境
     		id：环境的唯一识别码
     	 -->
     	   <environment id="dev">
     	   <!-- 
     	   		事务管理器
     	   		type：用于设置mybaties采用什么方式管理事务
     	   		JDBC表示采用和JDBC一样的事务管理方式
     	    -->
     			<transactionManager type="JDBC"></transactionManager>
     			<!-- 
     			数据源/连接池，用于配置连接池和数据库连接的参数
     			type：用于设置mybatis是否采用连接池技术
     				POOLED表示mybatis采用连接池技术
     			 -->
     			<dataSource type="POOLED">
     				<property name="driver" value="com.mysql.jdbc.Driver"/>
     				<property name="url" value="jdbc:mysql://localhost:3306/java505"/>
     				<property name="username" value="root"/>
     				<property name="password" value="szxy"/>
     			</dataSource>
     	  </environment>
     	</environments>
     	<!-- 扫描mapper文件 -->
     	<mappers>
     		<mapper resource="cn/bjsxt/mapper/UserMapper.xml"/>
     	</mappers>
     </configuration>

package cn.bjsxt.pojo;

import java.io.Serializable;

public class User implements Serializable{
	private int id;
	private String name;
	private String password;
	
	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 getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public User(int id, String name, String password) {
		super();
		this.id = id;
		this.name = name;
		this.password = password;
	}
	public User() {
		super();
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", password=" + password + "]";
	}
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + id;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		result = prime * result + ((password == null) ? 0 : password.hashCode());
		return result;
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		User other = (User) obj;
		if (id != other.id)
			return false;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		if (password == null) {
			if (other.password != null)
				return false;
		} else if (!password.equals(other.password))
			return false;
		return true;
	}
	
	
}

<?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,可以随意定义，一般情况下要写全限定路径
  	MyBatis管理SQL语句是通过namespace+id来定位的
   -->
<mapper namespace="cn.bjsxt.mapper.UserMapper">
	<!-- 
		select 标签用于编写查询语句
		id ：sql的唯一标识
		resultType:用于设置返回结果的类型（全限定路径）
		    如果返回结果是集合，要写泛型的类型
	 -->
	<select id="selAll"  resultType="cn.bjsxt.pojo.User">
		select * from t_user
	</select>
</mapper>

package cn.bjsxt.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import cn.bjsxt.pojo.User;

public class Test {
	
	@org.junit.Test
	public void testSelAll () throws IOException {
		//加载MyBatis核心配置文件
		InputStream is=Resources.getResourceAsStream("MyBatis.xml"); 
		//构建sqlSqssionFactory工厂对象
		SqlSessionFactory factory=new SqlSessionFactoryBuilder().build(is);
		//通过工厂打开SQLsession执行查询操作
		SqlSession session=factory.openSession();
		//通过session执行查询操作
		List<User>list=session.selectList("cn.bjsxt.mapper.UserMapper.selAll");
		
		System.out.println(list);
		//关闭资源
		session.close();
	}
}