把json数据转化成对象

把json数据转化到一个对象中，再用对象直接调用

 package com.lxj.register;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.MalformedURLException;
 import java.net.URL;

 import net.sf.json.JSONObject;

 public class Demo {
     public static void main(String[] args) {
         try {
             // 创建URL连接到服务器
             URL url = new URL("http://192.168.18.249:8080/order/register");
             try {
                 // 创建输入流
                 BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
                 StringBuffer sb = new StringBuffer();
                 String st ;
                 // 开始接受数据，先接受到st中
                 while((st = br.readLine()) != null){
                     // 再拼接到sd中
                     sb.append(st);
                 }
                 // 打印出所有的数据
                 System.out.println(sb.toString());
                 // JSONObject.toBean()把JSONObject转化成Register对象
                 // JSONObject.fromObject(sb.toString()把sb.toString字符串转化为JsonObject
                 // Register.class意思是转化成Register
                 Register register = (Register) JSONObject.toBean(JSONObject.fromObject(sb.toString()),Register.class);
                 // 服务器的数据存入了Register对象中，只要register调用就可以了
                 System.out.println("msg:"+register.getMsg());
                 System.out.println("retCode:"+register.getRetCode());
                 System.out.println("姓名:"+register.getInfo().getName());
                 System.out.println("性别:"+register.getInfo().getSex());
             } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         } catch (MalformedURLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
 }

 package com.lxj.register;

 public class Register {
     private String msg;
     private String retCode;
     private Info info;

     // 生成set get 方法
     public String getMsg() {
         return msg;
     }

     public void setMsg(String msg) {
         this.msg = msg;
     }

     public String getRetCode() {
         return retCode;
     }

     public void setRetCode(String retCode) {
         this.retCode = retCode;
     }

     public Info getInfo() {
         return info;
     }

     public void setInfo(Info info) {
         this.info = info;
     }

     // 把Info创建成内部类，外部类可以直接调用
     public static class Info {
         private String name;
         private String sex;
         public String getName() {
             return name;
         }
         public void setName(String name) {
             this.name = name;
         }
         public String getSex() {
             return sex;
         }
         public void setSex(String sex) {
             this.sex = sex;
         }

     }
 }