Intellij IDEA +MAVEN+Jetty实现Mybatis的HelloWorld

1 maven配置：pom.xml

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>MybatisTest</groupId>
  <artifactId>MybatisTest-Demo1</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>MybatisTest-Demo1 Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>

    <!--mysql driver-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>RELEASE</version>
    </dependency>


  </dependencies>
  <build>
    <finalName>MybatisTest-Demo1</finalName>
  </build>
</project>

2 实体类：Employee.java

package com.mybatis.model;

/**
 * Created by wanggenshen_sx on 2016/12/23.
 */
public class Employee {

    private int id;
    private String lastName;
    private String email;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    @Override
    public String toString() {
        return "Employee [id=" + id + ", lastName=" + lastName + ", email="
                + email+" ]" ;
    }
}

3 EmployeeMapper接口：

package com.mybatis.mapper;

import com.mybatis.model.Employee;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * Created by wanggenshen_sx on 2016/12/26.
 */
public interface EmployeeMapper {
    @Select("select * from employee where id=#{id}")
    public Employee getUserById(int id);

    @Select("select * from employee")
    public List<Employee> getAllUsers();
}

4 工具类

package com.mybatis.dao;

import com.mybatis.test.EmployeeTest;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.InputStream;

/**
 * Created by wanggenshen_sx on 2016/12/26.
 * 获得SqlSessionFactory的工具类
 */
public class MybatisUtils {
    public static SqlSessionFactory getSqlSessionFactory(){
        String resource = "mybatis.xml";
        //1 加载mybatis的配置文件，也加载关联的映射文件
        InputStream is=EmployeeTest.class.getClassLoader().getResourceAsStream(resource);

        //2 构建SqlSession工厂
        SqlSessionFactory  sessionFactory = new SqlSessionFactoryBuilder().build(is);

        return sessionFactory;
    }
}

5 测试

package com.mybatis.test;

import com.mybatis.dao.MybatisUtils;
import com.mybatis.mapper.EmployeeMapper;
import com.mybatis.model.Employee;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import java.io.InputStream;

/**
 * Created by wanggenshen_sx on 2016/12/26.
 */
public class EmployeeTest {
    /**
     * 根据一个id得到一条用户信息
     */
    @Test
    public void testGetUser(){
        SqlSession session = MybatisUtils.getSqlSessionFactory().openSession();
        EmployeeMapper mapper = session.getMapper(EmployeeMapper.class);

        Employee employee = mapper.getUserById(1);
        System.out.println("*"+employee);
        session.close();
    }
}

6 mybatis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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/mytest" />
                <property name="username" value="root" />
                <property name="password" value="920614" />
            </dataSource>
        </environment>
    </environments>

    <!-- 注册userMapper.xml文件 -->
    <mappers>
        <mapper class="com.mybatis.mapper.EmployeeMapper"/>
    </mappers>

</configuration>

结构：