JSON字符串与Map互转

//一、map转为json字符串

    public static String map2jsonstr(Map<String,?> map){
        return JSONObject.toJSONString(map);
    }

//二、json字符串转Map对象

    public static Map<String,?> jsonstr2map(String jsonstr){
        return JSONObject.parseObject(jsonstr);
    }

//三、json字符串转Map对象

public static Map<String, Object> parseJSON2Map(String jsonStr){
Map<String, Object> map = new HashMap<String, Object>();
JSONObject json = JSONObject.parseObject(jsonStr);
for(Object k : json.keySet()){
Object v = json.get(k);
if(v instanceof JSONArray){
List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
Iterator<Object> it = ((JSONArray)v).iterator();
while(it.hasNext()){
JSONObject json2 = (JSONObject)it.next();
list.add(parseJSON2Map(json2.toString()));
}
map.put(k.toString(), list);
} else {
map.put(k.toString(), v);
}
} 
return map; 
}

测试：

    public static void main(String[] args) {

        try {

            List list = new ArrayList();
            Map<String,Object> map = new HashMap<String,Object>();
            list.add(1);
            list.add("b");
            map.put("name", "a");
            map.put("age", 12);
            map.put("name", "a");
            map.put("list", list);
            String jsonstr = map2jsonstr(map);
            System.out.println("json字符串：" + jsonstr);
            System.out.println("map对象"+jsonstr2map(jsonstr));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }