JSONObject，JSONArray使用手册

这两个是官网的API

http://json.org/javadoc/org/json/JSONObject.html

http://json.org/javadoc/org/json/JSONArray.html

里面有这两个类的所有方法，是不可多得的好材料哦~

配合上面的API，大家再看下这段代码，就会大有收获了~

import net.sf.json.JSONArray;  
import net.sf.json.JSONObject;  
import java.util.*;  
/** 
 * 
 * @author Administrator 
 */  
public class JavaTest {  
    public static void main(String[] args){    
       JSONObject obj=new JSONObject();  
       obj.put("derek","23");  
       obj.put("dad", "49");  
       obj.put("mom", "45");  
       System.out.println("通过构造器的方式创建的JSONObject对象："+obj);  
         
       Map<String,String> map=new LinkedHashMap<>();  
       map.put("derek","23");  
       map.put("dad", "49");  
       map.put("mom", "45");  
       System.out.println("通过fromObject方法将map对象转换为JSONObject对象："+JSONObject.fromObject(map));  
         
       JSONArray arr=new JSONArray();  
       arr.add(0,"derek");  
       arr.add(1,"dad");  
       arr.add(2,"mom");  
       System.out.println("通过构造器的方式创建的JSONArray："+arr);  
         
       ArrayList<String> list=new ArrayList<>();  
       list.add("derek");  
       list.add("dad");  
       list.add("mom");  
       System.out.println("通过fromObject方法将Arraylist对象转换为JSONArray对象："+JSONArray.fromObject(list));  
         
       System.out.println("将HashMap对象通过fromObject方法转换为JSONArray对象"+JSONArray.fromObject(map));  
         
       String str="{\"derek\":23,\"dad\":49,\"mom\":45}";  
       System.out.println("解析之后的JSON对象："+JSONObject.fromObject(str));  
         
       //遍历输出  
       Iterator<String> it=obj.keys();  
       while(it.hasNext()){  
           String key=it.next();  
           System.out.println(key+":"+obj.get(key));  
       }  
    }  
      
}  

运行结果如下：

通过构造器的方式创建的JSONObject对象：{"derek":"23","dad":"49","mom":"45"}
通过fromObject方法将map对象转换为JSONObject对象：{"derek":"23","dad":"49","mom":"45"}
通过构造器的方式创建的JSONArray：["derek","dad","mom"]
通过fromObject方法将Arraylist对象转换为JSONArray对象：["derek","dad","mom"]
将HashMap对象通过fromObject方法转换为JSONArray对象[{"derek":"23","dad":"49","mom":"45"}]
解析之后的JSON对象：{"derek":23,"dad":49,"mom":45}
derek:23
dad:49
mom:45