JSONArray 与 String 之间转换

import java.util.Map;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class test {
  public static void main(String[] args) {
	  //转化成
	  JSONObject obj = new JSONObject();
      obj.put("itemUuid", "dafddsfdsfsdf");
      obj.put("top", 0);
      System.out.println(obj);
      JSONArray arr = new JSONArray();
      arr.add(obj);
      System.out.println(arr);
      String str = JSONArray.toJSONString(arr);
      System.out.println(str);
      //解析
      JSONArray jsonArr = JSONArray.parseArray(str);
      System.out.println(jsonArr);
      if(jsonArr.size()>0){
    	 for(int j=0;j mapO = jsonObj;
    		 String itemUuid = (String)mapO.get("itemUuid");
		     int top = Integer.parseInt(mapO.get("top").toString());
		     System.out.println(itemUuid);
		     System.out.println(top);
    	 } 
      }
      //排序
      List list = JSONArray.parseArray(jsonArr.toJSONString(), JSONObject.class);
	Collections.sort(list, new Comparator() {
	    @Override
	    public int compare(JSONObject o1, JSONObject o2) {
	        int a = o1.getInteger("top");
	        int b = o2.getInteger("top");
	        if (a < b) {
	            return 1;
	        } else if(a == b) {
	            return 0;
	        } else
	            return -1;
	        }
	});
	JSONArray jsonArray = JSONArray.parseArray(list.toString());
	System.out.println("排序后：" + jsonArray);
   }
}