json-lib的使用

浏览数：32 / 时间：2015年06月09日

JSONObject和JSONArray的使用

需要依赖的包：commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar ezmorph.jar json-lib-2.2.2-jdk15.jar

//1. 创建一个JSONObject对象：
  
import java.util.ArrayList;  
import java.util.HashMap;  
  
import net.sf.json.JSONArray;  
import net.sf.json.JSONObject;  
  
  
public class Test {  
  
    public static void main(String[] args) {  
//JsonObject和JsonArray区别就是JsonObject是对象形式，JsonArray是数组形式  
        //创建JsonObject第一种方法  
        JSONObject jsonObject = new JSONObject();  
        jsonObject.put("UserName", "ZHULI");  
        jsonObject.put("age", "30");  
        jsonObject.put("workIn", "ALI");  
        System.out.println("jsonObject1：" + jsonObject);  
          
        //创建JsonObject第二种方法  
        HashMap<String, String> hashMap = new HashMap<String, String>();  
        hashMap.put("UserName", "ZHULI");  
        hashMap.put("age", "30");  
        hashMap.put("workIn", "ALI");  
        System.out.println("jsonObject2：" + JSONObject.fromObject(hashMap));  
          
        //创建一个JsonArray方法1  
        JSONArray jsonArray = new JSONArray();  
        jsonArray.add(0, "ZHULI");  
        jsonArray.add(1, "30");  
        jsonArray.add(2, "ALI");  
        System.out.println("jsonArray1：" + jsonArray);  
          
        //创建JsonArray方法2  
        ArrayList<String> arrayList = new ArrayList<String>();  
        arrayList.add("ZHULI");  
        arrayList.add("30");  
        arrayList.add("ALI");  
        System.out.println("jsonArray2：" + JSONArray.fromObject(arrayList));  
          
        //如果JSONArray解析一个HashMap，则会将整个对象的放进一个数组的值中  
        System.out.println("jsonArray FROM HASHMAP：" + JSONArray.fromObject(hashMap));  
          
        //组装一个复杂的JSONArray  
        JSONObject jsonObject2 = new JSONObject();  
        jsonObject2.put("UserName", "ZHULI");  
        jsonObject2.put("age", "30");  
        jsonObject2.put("workIn", "ALI");  
        jsonObject2.element("Array", arrayList);  
        System.out.println("jsonObject2：" + jsonObject2);  
                  
    }  
}  

//结果：
/*
jsonObject1：{"UserName":"ZHULI","age":"30","workIn":"ALI"}  
jsonObject2：{"workIn":"ALI","age":"30","UserName":"ZHULI"}  
jsonArray1：["ZHULI","30","ALI"]  
jsonArray2：["ZHULI","30","ALI"]  
jsonArray FROM HASHMAP：[{"workIn":"ALI","age":"30","UserName":"ZHULI"}]  
jsonObject2：{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}  
*/

//解析JSON字符串：
import net.sf.json.JSONArray;  
import net.sf.json.JSONObject;  
 
public class Test {  
  
    public static void main(String[] args) {  
        String jsonString = "{\"UserName\":\"ZHULI\",\"age\":\"30\",\"workIn\":\"ALI\",\"Array\":[\"ZHULI\",\"30\",\"ALI\"]}";  
        //将Json字符串转为java对象  
        JSONObject obj = JSONObject.fromObject(jsonString);  
        //获取Object中的UserName  
        if (obj.has("UserName")) {  
            System.out.println("UserName:" + obj.getString("UserName"));  
        }  
        //获取ArrayObject  
        if (obj.has("Array")) {  
            JSONArray transitListArray = obj.getJSONArray("Array");  
            for (int i = 0; i < transitListArray.size(); i++) {  
                System.out.print("Array:" + transitListArray.getString(i) + " ");  
            }  
        }  
    }  
}  

//返回：
/*
UserName:ZHULI  
Array:ZHULI Array:30 Array:ALI   
*/

//对象遍历
if (!obj.isNull("sku")) {  
    HashMap<String, String> skuMap = new HashMap<String, String>();  
    JSONObject skuObject = obj.getJSONObject("sku");  
    Iterator<String> keys = skuObject.keys();  
    String key;  
    Object o;  
    while (keys.hasNext()) {  
        key = keys.next();  
        o = skuObject.get(key);  
        skuMap.put(key, String.valueOf(o));  
    }  
}