通过MyBatis读取数据库数据并提供rest接口访问_JAVA教程

1 mysql 创建数据库脚本

									-- phpMyAdmin SQL Dump

									-- version 4.2.11

									-- http://www.phpmyadmin.net

									--

									-- Host: localhost

									-- Generation Time: 2016-08-02 18:13:50

									-- 服务器版本： 5.6.21

									-- PHP Version: 5.6.3

									SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";

									SET time_zone = "+00:00";

									/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;

									/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;

									/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;

									/*!40101 SET NAMES utf8 */;

									--

									-- Database: `mybatis`

									--

									-- --------------------------------------------------------

									--

									-- 表的结构 `Student`

									--

									CREATE TABLE IF NOT EXISTS `Student` (

									`id` int(10) NOT NULL,

									`name` varchar(256) NOT NULL,

									`age` int(4) NOT NULL

									) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;

									--

									-- 转存表中的数据 `Student`

									--

									INSERT INTO `Student` (`id`, `name`, `age`) VALUES

									(1, 'zhansan', 20);

									--

									-- Indexes for dumped tables

									--

									--

									-- Indexes for table `Student`

									--

									ALTER TABLE `Student`

									ADD PRIMARY KEY (`id`);

									--

									-- AUTO_INCREMENT for dumped tables

									--

									--

									-- AUTO_INCREMENT for table `Student`

									--

									ALTER TABLE `Student`

									MODIFY `id` int(10) NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=2;

									/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;

									/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;

									/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

2 创建与数据库表Student对应的pojo类

									package com.mtour.mybatis.demo;

									import javax.xml.bind.annotation.XmlRootElement;

									@XmlRootElement

									public class Student {

									int id;

									String name;

									int age;

									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 int getAge() {

									return age;

									}

									public void setAge(int age) {

									this.age = age;

									}

									}

3 创建映射 studentMapper

									<?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.mtour.mybatis.demo.studentMapper">

									<select id="getStudent" parameterType="int"

									resultType="com.mtour.mybatis.demo.Student">

									select * from Student where id=#{id}

									</select>

									</mapper>

4. 创建 conf.xml

									<?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" />

									<!-- 配置数据库连接信息 -->

									<dataSource type="POOLED">

									<property name="driver" value="com.mysql.jdbc.Driver" />

									<property name="url" value="jdbc:mysql://localhost:3306/mybatis" />

									<property name="username" value="root" />

									<property name="password" value="" />

									</dataSource>

									</environment>

									</environments>

									<mappers>

									<mapper resource="com/mtour/mybatis/demo/studentMapper.xml"/>

									</mappers>

									</configuration>

5. 创建 rest 资源

									package com.mtour.mybatis.demo;

									import java.io.IOException;

									import java.io.InputStream;

									import org.apache.ibatis.session.SqlSession;

									import org.apache.ibatis.session.SqlSessionFactory;

									import org.apache.ibatis.session.SqlSessionFactoryBuilder;

									import javax.ws.rs.GET; 

									import javax.ws.rs.Path; 

									import javax.ws.rs.Produces; 

									import javax.ws.rs.PathParam; 

									import javax.ws.rs.core.MediaType; 

									@Path("/student") 

									public class demo { 

									static String resource = "conf.xml";

									static InputStream is = demo.class.getClassLoader().getResourceAsStream(resource);

									static SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);

									@GET

									@Produces(MediaType.TEXT_PLAIN) 

									public String sayHello() { 

									return "hello jersey , first demo" ; 

									} 

									@GET

									@Path("/{param}") 

									@Produces("text/plain;charset=UTF-8") 

									public String sayHelloToUTF8(@PathParam("param") String username) { 

									return "Hello " + username; 

									} 

									@GET

									@Path("/getstudent/{id}") 

									@Produces(MediaType.APPLICATION_JSON) 

									public Student getUserJson(@PathParam("id") String id) { 

									Integer studentId = Integer.valueOf(id);

									SqlSession session = sessionFactory.openSession();

									String statement = "com.mtour.mybatis.demo.studentMapper.getStudent";

									Student s = session.selectOne(statement, studentId);

									session.close();

									return s; 

									}

									}