JSON net.sf.json



1.JAR包简介

要使程序可以运行必须引入JSON-lib包，JSON-lib包同时依赖于以下的JAR包：

1. commons-lang.jar
2. commons-beanutils.jar
3. commons-collections.jar
4. commons-logging.jar 
5. ezmorph.jar
6. json-lib-2.2.2-jdk15.jar

2.JSONObject对象使用

JSON-lib包是一个beans,collections,maps,java arrays 和XML和JSON互相转换的包。在本例中，我们将使用JSONObject类创建JSONObject对象，然后我们打印这些对象的值。为了使用 JSONObject对象，我们要引入"net.sf.json"包。为了给对象添加元素，我们要使用put()方法。

2.1.实例1

 

package jsontest;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class JSONObjectSample {

    // 创建JSONObject对象
    private static JSONObject createJSONObject() {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("username", "huangwuyi");
        jsonObject.put("sex", "男");
        jsonObject.put("QQ", "413425430");
        jsonObject.put("Min.score", new Integer(99));
        jsonObject.put("nickname", "梦中心境");
        return jsonObject;
    }

    public static void main(String[] args) {
        JSONObject jsonObject = JSONObjectSample.createJSONObject();//静待方法，直接通过类名+方法调用
        // 输出jsonobject对象
        System.out.println("jsonObject：" + jsonObject);

        // 判读输出对象的类型
        boolean isArray = jsonObject.isArray();
        boolean isEmpty = jsonObject.isEmpty();
        boolean isNullObject = jsonObject.isNullObject();
        System.out.println("是否为数组:" + isArray + "， 是否为空:" + isEmpty
                + "， isNullObject:" + isNullObject);

        // 添加属性，在jsonObject后面追加元素。
        jsonObject.element("address", "福建省厦门市");
        System.out.println("添加属性后的对象：" + jsonObject);

        // 返回一个JSONArray对象
        JSONArray jsonArray = new JSONArray();
        jsonArray.add(0, "this is a jsonArray value");
        jsonArray.add(1, "another jsonArray value");
        jsonObject.element("jsonArray", jsonArray);
        //在jsonObject后面住家一个jsonArray
        JSONArray array = jsonObject.getJSONArray("jsonArray");
        System.out.println(jsonObject);
        
        
        System.out.println("返回一个JSONArray对象：" + array);
        // 添加JSONArray后的值
        // {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
        System.out.println("结果=" + jsonObject);

        // 根据key返回一个字符串
        String username = jsonObject.getString("username");
        System.out.println("username==>" + username);

        // 把字符转换为 JSONObject
        String temp = jsonObject.toString();
        JSONObject object = JSONObject.fromObject(temp);
        // 转换后根据Key返回值
        System.out.println("qq=" + object.get("QQ"));

    }

}

输出结果

jsonObject：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境"}
是否为数组:false， 是否为空:false， isNullObject:false
添加属性后的对象：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市"}
{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
返回一个JSONArray对象：["this is a jsonArray value","another jsonArray value"]
结果={"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
username==>huangwuyi
qq=413425430

2.2.实例2.

package jsontest;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class JSONTest {
    public static void main(String args[])
    {
        JSONObject jsonObj0  = new JSONObject();
        JSONObject jsonObj  = new JSONObject();
        JSONObject jsonObj2  = new JSONObject();
        JSONObject jsonObj3  = new JSONObject();
        JSONArray jsonArray = new JSONArray();
        
        //创建jsonObj0
        jsonObj0.put("name0", "zhangsan");
        jsonObj0.put("sex1", "female");
        System.out.println("jsonObj0:"+jsonObj0);
        
        //创建jsonObj1
        jsonObj.put("name", "xuwei");
        jsonObj.put("sex", "male");
        System.out.println("jsonObj:"+jsonObj);
    
        //创建jsonObj2，包含两个条目，条目内容分别为jsonObj0，jsonObj1
        jsonObj2.put("item0", jsonObj0);
        jsonObj2.put("item1", jsonObj);
        System.out.println("jsonObj2:"+jsonObj2);
        
        //创建jsonObj3，只有一个条目，内容为jsonObj2
        jsonObj3.element("j3", jsonObj2);
        System.out.println("jsonObj3:"+jsonObj3);
    
        //往JSONArray中添加JSONObject对象。发现JSONArray跟JSONObject的区别就是JSONArray比JSONObject多中括号[]
        jsonArray.add(jsonObj);
        System.out.println("jsonArray:"+jsonArray);
        
        JSONObject jsonObj4  = new JSONObject();
        jsonObj4.element("weather", jsonArray);
        System.out.println("jsonObj4:"+jsonObj4);
    }
}

输出结果：

jsonObj0:{"name0":"zhangsan","sex1":"female"}
jsonObj:{"name":"xuwei","sex":"male"}
jsonObj2:{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}
jsonObj3:{"j3":{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}}
jsonArray:[{"name":"xuwei","sex":"male"}]
jsonObj4:{"weather":[{"name":"xuwei","sex":"male"}]}


关于java bean的处理

创建java对象：

public class Address {
 private String road;
 private String streate;
 private String provience;
 private String no;
 public String getRoad() {
  return road;
 }
 public void setRoad(String road) {
  this.road = road;
 }
 public String getStreate() {
  return streate;
 }
 public void setStreate(String streate) {
  this.streate = streate;
 }
 public String getProvience() {
  return provience;
 }
 public void setProvience(String provience) {
  this.provience = provience;
 }
 public String getNo() {
  return no;
 }
 public void setNo(String no) {
  this.no = no;
 }
}

1.将json对象转化为java对象

 JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");
  Address Address  = (Address) JSONObject.toBean(jsonObject,Address.class);
  log.info(Address.getNo());
  log.info(Address.getStreate());
  log.info(Address.getProvience());
  log.info(Address.getRoad());

 

2.将java对象转化为json对象

   将java对象转化为json对象：

    Address address = new Address();
    address.setNo("104");
    address.setProvience("陕西");
    address.setRoad("高新路");
    address.setStreate("");
    JSONArray json = JSONArray.fromObject(address);
    log.info(json.toString());

 

  将java对象list转化为json对象：

  Address address = new Address();
  address.setNo("104");
  address.setProvience("陕西");
  address.setRoad("高新路");
  address.setStreate("");
  Address address2 = new Address();
  address2.setNo("105");
  address2.setProvience("陕西");
  address2.setRoad("未央路");
  address2.setStreate("张办");
  List list = new ArrayList();
  list.add(address);
  list.add(address2);
  JSONArray json = JSONArray.fromObject(list);
  log.info(json.toString());

3.JSONArray转化为list

JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");
  JSONArray jsonArray = new JSONArray();
  jsonArray.add("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");
  jsonArray.add("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"123\"}");
  Object object = JSONArray.toList(jsonArray,Address.class);