Servlet解析JSON数据和发送JSON数据

[java]view plain copy
package com.jcuckoo.util;  
  
import java.io.BufferedReader;  
import java.io.IOException;  
import java.io.InputStreamReader;  
import java.io.UnsupportedEncodingException;  
import javax.servlet.http.HttpServletRequest;  
import net.sf.json.JSONObject;  
  
public class JsonReader {  
    public static JSONObject receivePost(HttpServletRequest request) throws IOException, UnsupportedEncodingException {  
  
        // 读取请求内容  
        BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream(),"utf-8"));  
        String line = null;  
        StringBuilder sb = new StringBuilder();  
        while ((line = br.readLine()) != null) {  
            sb.append(line);  
        }  
        //将json字符串转换为json对象  
        JSONObject json=JSONObject.fromObject(sb.toString());  
        return json;  
    }  
}  

[java]view plain copy
package com.jcuckoo.servlet;  
  
import java.io.IOException;  
import java.io.Writer;  
import javax.servlet.ServletException;  
import javax.servlet.annotation.WebServlet;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import com.jcuckoo.pojos.User;  
import com.jcuckoo.service.UserService;  
import com.jcuckoo.util.JsonReader;  
import net.sf.json.JSONObject;  
@WebServlet("/LoginUserServlet")  
public class LoginUserServlet extends HttpServlet {  
    private static final long serialVersionUID = 1L;  
  
    public LoginUserServlet() {  
        super();  
    }  
  
    protected void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        doPost(request, response);  
    }  
  
    protected void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        // response.setContentType("text/html");  
        // 设置字符编码为UTF-8, 这样支持汉字显示  
        // response.setCharacterEncoding("UTF-8");  
  
        response.setContentType("text/html;charset=utf-8");  
  
        /** 设置响应头允许ajax跨域访问 **/  
        response.setHeader("Access-Control-Allow-Origin", "*");  
        /* 星号表示所有的异域请求都可以接受， */  
        response.setHeader("Access-Control-Allow-Methods", "GET,POST");  
  
        Writer out = response.getWriter();  
  
  
        JSONObject json=JsonReader.receivePost(request);  
        System.out.println(json);  
          
        UserService userService=new UserService();  
          
        //将建json对象转换为java对象  
        User loginUser = (User)JSONObject.toBean(json,User.class);  
        User user = userService.LoginUser(loginUser);  
        JSONObject jsonObject=new JSONObject() ;  
        if(user!=null){  
            //将java对象转换为json对象  
            jsonObject.put("user", JSONObject.fromObject(user));  
            jsonObject.put("message", "用户登录成功！");  
        }else{  
  
            jsonObject.put("message", "用户登录失败！");  
        }  
        out.write(jsonObject.toString());  
        out.flush();  
    }  
}  

[java]view plain copy
<%@ page language="java" contentType="text/html; charset=utf-8"%>  
<!DOCTYPE html >  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<title>Servlet-jCuckoo</title>  
<script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>  
</head>  
<body>  
    <form >  
        用户名：<input type="text" id="userName"/><br/>  
        密码：<input type="password" id="userPwd"/><br/>  
        <input type="button" value="登录" id="sender">   
    </form>  
    <div id="messageDiv"></div>  
      
    <script>  
    $('#sender').click(function(){  
        var userName=document.getElementById('userName').value;  
        var userPwd=document.getElementById('userPwd').value;  
        var user={userName:userName,userPwd:userPwd};  
        var url="LoginUserServlet";  
          
        $.post(url, JSON.stringify(user), function(data) {  
              console.log(data);  
             $("#messageDiv").html(data);  
             var json=JSON.parse(data);  
             alert(json.message);  
         });   
         /* $.ajax({ 
            type:'post', 
            url:url, 
            dataType:"json",             
            data:JSON.stringify(user), 
            success: function (data) { 
                var user=data.user; 
                 $("#messageDiv").html(JSON.stringify(user)); 
                 alert(data.message); 
            }, 
            error: function (data) { 
                 alert(data.message); 
                 $("#messageDiv").html(""); 
            } 
        });  */  
          
    });  
    </script>  
</body>  
</html>  

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Servlet解析JSON数据和发送JSON数据

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