在android客户端进行登录，输入账号密码，访问服务器端的servlet，连接数据库mysql查询是否有该用户，有就返回json数据给android，用Toast弹出登录成功。
json我是在服务端和客户端都封装了一个类Result，里面两个值一个String Rs和int value。运行的时候报错了，网上搜说是后台返回的数据不是纯json，帮忙看看我这样要怎么解决，谢谢！
客户端：
java：
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private String url = "http://192.168.1.102:8089/Contacts/LoginAndroidServlet";
private String LoginAddress = null;
private EditText tell;
private EditText password;
private Button btn_login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tell = findViewById(R.id.edit_inputTell);
password = findViewById(R.id.edit_inputPwd);
btn_login = findViewById(R.id.button_login);
btn_login.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.button_login){
String tellnum = tell.getText().toString();
String pwd = password.getText().toString();
LoginAddress = url+"?tell="+tellnum+"&pwd="+pwd;
login();
}
}
private void login() {
HttpUtil.sendOkHttpRequest(LoginAddress, new okhttp3.Callback(){
@Override
public void onFailure(Call call, IOException e) {
//对异常情况进行处理
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//得到服务器返回的具体内容---获取到了LoginAndroidServlet用户登录的结果
String responseData = response.body().string().trim();
int result = parseJSONWithGson(responseData);
if (result > 0){
//登录成功...待开发,转入新界面
Toast.makeText(MainActivity.this, "登录成功...待开发,转入新界面", Toast.LENGTH_SHORT).show();
}else if (result < 0){
Toast.makeText(MainActivity.this, "服务器异常，等待修复", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(MainActivity.this, "手机号或者密码错误，请重试", Toast.LENGTH_SHORT).show();
}
}
});
}
private int parseJSONWithGson(String jsonData){
Gson gson = new Gson();
Result rs = gson.fromJson(jsonData, Result.class);
return rs.getValue();
}
}
Result类
public class Result {
private String Rs;
private int value;
public Result() {
}
public Result(String rs, int value) {
super();
Rs = rs;
this.value = value;
}
public String getRs() {
return Rs;
}
public void setRs(String rs) {
Rs = rs;
}
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
服务器端：
package org.login.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.login.eneity.Login;
import org.login.eneity.Result;
import org.login.service.ILoginService;
import org.login.service.impl.LoginServiceImpl;
import com.google.gson.Gson;
public class LoginAndroidServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
//获取输入信息
String tell = request.getParameter("tell");
String pwd = request.getParameter("pwd");
System.out.println(tell + "服务器是否接收到android");
System.out.println(pwd + "服务器是否接收到android");
//获取了以后1.查询是否有此用户
Login login = new Login(tell, pwd);
ILoginService loginService = new LoginServiceImpl();
int result = loginService.login(login);
response.setContentType("text/html; charset=utf-8");
response.setCharacterEncoding("utf-8");
//result=0账号或密码有误，result=1成功， result=-1服务器异常
if(result > 0) {
/*传result的值给android
* 方案1：查询出uid一并给android
* 方案2：查询出该用户的联系人一并传给android
Gson gson = new Gson();
String json = gson.toJson(login); */
Result rs = new Result("result", 1);
Gson gson = new Gson();
String json_result = gson.toJson(rs);
System.out.println(json_result);
System.out.println(result);
request.setAttribute("json_result", json_result);
}else if(result < 0) {
//传result的值给android
Result rs = new Result("result", -1);
Gson gson = new Gson();
String json_result = gson.toJson(rs);
System.out.println(json_result);
request.setAttribute("json_result", json_result); //服务器异常
}else {
//传result的值给android
Result rs = new Result("result", 0);
Gson gson = new Gson();
String json_result = gson.toJson(rs);
System.out.println(json_result);
request.setAttribute("json_result", json_result); //账号或密码错误
}
request.getRequestDispatcher("login_a.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
转到的login_a.jsp，原来的想法是把json字符串在这个jsp页面输出，然后Android请求访问最后访问到这个页面就取到了result的值，来判断是否登录成功
<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
String json = request.getAttribute("json_result").toString().trim();
if (json != null){
out.print(json);
System.out.print(json);
}
%>
</body>
</html>
谢谢
