Java后台接口开发初步实战

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" ?>
<!DOCTYPE mapper
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>