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;
        }
        
    }
}