详解android与服务端交互的两种方式

做Android开发的程序员必须知道android客户端应该如何与服务端进行交互，这里主要介绍的是使用JSON数据进行交互。服务端从数据库查出数据并以json字符串的格式或者map集合的格式返回到客户端，客户端进行解析并输出到手机屏幕上。

此处介绍两种方式：使用Google原生的Gson解析json数据，使用JSONObject解析json数据

一、使用Google原生的Gson解析json数据：

记得在客户端添加gson.jar。

核心代码：

服务端：

package com.mfc.ctrl;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.annotation.Resource;import javax.servlet.Http.httpservletRequest;import org.springframework.stereotype.Controller;import org.springframework.WEB.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.mfc.dao.TblUserDao;import com.mfc.entity.TblUser;@Controller@RequestMapping("tblUserCtrl")public class TblUserCtrl {  @Resource(name="tblUserDao")  TblUserDao tblUserDao;  //添加用户  @RequestMapping("addUser")  @ResponseBody  public Object addUser(HttpServletRequest request){    String uname=request.getParameter("uname");    String upass=request.getParameter("upass");    float money=Float.parseFloat(request.getParameter("money"));    System.out.println(uname+"==="+upass+"==="+money);    TblUser tblUser=new TblUser();    tblUser.setMoney(money);    tblUser.setUname(uname);    tblUser.setUpass(upass);    tblUserDao.addUser(tblUser);    Map<String, Object> map=new HashMap<String, Object>();    map.put("success", "success");    return map;  }  //查看所有用户  @RequestMapping("getAllUser")  @ResponseBody  public Object getAllUser(){    List<TblUser> list = tblUserDao.selectAllUser();    Map<String, Object> map=new HashMap<String, Object>();    map.put("list", list);    return map;  }  //删除用户  @RequestMapping("delUser")  @ResponseBody  public Object delUser(HttpServletRequest request){    int uid=Integer.parseInt(request.getParameter("uid"));    TblUser tblUser=tblUserDao.getUserById(uid);    tblUserDao.delUser(tblUser);    Map<String, Object> map=new HashMap<String, Object>();    map.put("success", "success");    return map;  }  //修改用户  @RequestMapping("updateUser")  @ResponseBody  public Object updateUser(HttpServletRequest request){    int uid=Integer.parseInt(request.getParameter("uid"));    String uname=request.getParameter("uname");    String upass=request.getParameter("upass");    float money=Float.parseFloat(request.getParameter("money"));    TblUser tblUser=new TblUser();    tblUser.setMoney(money);    tblUser.setUid(uid);    tblUser.setUname(uname);    tblUser.setUpass(upass);    tblUserDao.updateUser(tblUser);    Map<String, Object> map=new HashMap<String, Object>();    map.put("success", "success");    return map;  }}