Java后台接口开发初步实战教程

上图是查询列表的接口，get方式

上图是用户注册的接口，同样是get，post方式也很简单

开发工具：IntelliJ IDEA 2016.3.5

ORM框架：MyBatis

数据库：MySql

服务器：tomcat7.0

公司使用的的orm框架是Hibernate，使用起来感觉比mybatis好用多了，毕竟经过了公司这么多项目的考验，总比自己用mybatis写的项目可靠，但以下分享的还是mybatis的代码

注册接口方法：

http://192.168.1.116:8080/register?username=111&password=222

@RequestMapping(value = "register", method = RequestMethod.GET) @ResponseBody public Map<String, Object> register(@RequestParam("username") String username, @RequestParam("password") String password) {  out.println("welcome to register,username=" + username + ";password=" + password);  Map<String, Object> map = new HashMap<>();  ResultBean result = onRegister(username, password);  out.println("result==>" + result);  map.put("code", result.getCode());  map.put("reason", result.getReason());  map.put("success", result.isSuccess());  return map; }

具体的注册方法，获取session基本和Hibernate差不多

private ResultBean onRegister(String username, String password) {  ResultBean resultBean = new ResultBean();  SqlSession session = null;  try {   session = sqlSessionFactory.openSession();   LoginMapper loginMapper = session.getMapper(LoginMapper.class);   Map<String, Object> map = new HashMap<>();   map.put("name", username);   map.put("password", password);   LoginBean bean = new LoginBean();   bean.setName(username);   bean.setPassword(password);   // 查询用户是否存在   LoginBean userExist = loginMapper.findUserByName(map);   if (userExist != null) {    // 存在后无法注册    resultBean.setCode("001");    resultBean.setSuccess(false);    resultBean.setReason("用户已存在");   } else {    loginMapper.addUser(bean);    session.commit();// 重要，一定要commit，否则无法insert    System.out.println("当前增加的用户id为：" + bean.getId());    resultBean.setCode("200");    resultBean.setSuccess(true);    resultBean.setReason("注册成功");   }  } catch (Exception e) {   e.printStackTrace();   out.println("注册异常==>" + e.getMessage());   resultBean.setCode("001");   resultBean.setSuccess(false);   resultBean.setReason("注册异常");  } finally {   session.close();  }  return resultBean; }

这个Mapper需要在配置文件中指定

public interface LoginMapper { public LoginBean findUserByName(Map<String,Object> map) throws Exception; public void addUser(LoginBean bean) throws Exception;}

这是对应的LoginMapper.xml

xml version="1.0" encoding="UTF-8" ?>  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"  "http://mybatis.org/dtd/mybatis-3-config.dtd"><mapper namespace="com.xm.travel.LoginMapper"> <select id="loadRunList" parameterType="java.util.Map" resultType="com.xm.travel.RunBean">  select * from run select> <select id="loginUser" parameterType="java.util.Map" resultType="com.xm.travel.LoginBean">  select * from user where name = #{name} and password = #{password} select> <select id="findUserByName" parameterType="java.util.Map" resultType="com.xm.travel.LoginBean">  select * from user where name = #{name} select> <insert id="addUser" useGeneratedKeys="true" keyProperty="id" >  insert into user(id,name,password) values(#{id},#{name},#{password}) insert>mapper>

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