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：