json对象 与java对象相互转换 文化馆资源库

1、把json字符串转换成 java对象

String jsonTemp = {'list':[{"id":"645","author":"33","batchName":"","cbrq":"","zhangjie":"33333"},{"id":"684","author":"徐常波","zhangjie":"文化论坛"},{"id":"683","author":"王仕平","zhangjie":"文化论坛"},{"id":"693","author":"唐宝洪","zhangjie":"小说世界"},{"id":"695","author":"饶岱华","zhangjie":"小说世界"},{"id":"694","author":"蔡伟璇","zhangjie":"小说世界"},{"id":"696","author":"陈 弘","batchName":"","cbrq":"","zhangjie":"小说世界"}]}

JSONObject objs = new JSONObject().fromObject(jsonTemp);//关键地方
		MorphDynaBean obj = (MorphDynaBean)JSONObject.toBean(objs);
		List<MorphDynaBean> mList = (List<MorphDynaBean>)obj.get("list"); 
		System.out.println(mList.get(0).get("zhangjie"));

2、把java对象转换成 json字符串

LinkedHashMap<String, List<MorphDynaBean>> dataMap = new LinkedHashMap<String, List<MorphDynaBean>>();
		for(MorphDynaBean md : mList){
			if(dataMap.get(md.get("zhangjie")) != null){
				dataMap.get(md.get("zhangjie")).add(md);
			}else{
				List<MorphDynaBean> llist = new ArrayList<MorphDynaBean>();
				llist.add(md);
				dataMap.put((String)md.get("zhangjie"), llist);
			}
		}

		String jsonMap = "";
		try {
			if(dataMap !=null){
				jsonMap = new JSONArray().fromObject(dataMap).toString();//关键地方
			}else{
				jsonMap = "[]";
			}
		} catch (Exception e) {
			e.printStackTrace();
		}