public static void JacksonTest() {
   //推荐        //{"MNG001":[{"ID":"1","PWD":"2"}],"MNG002":[{"FaultCode":"1","PWD":"3"}]}        String json = "{\"MNG001\":[{\"ID\":\"1\",\"PWD\":\"2\"}],\"MNG002\":[{\"FaultCode\":\"1\",\"PWD\":\"3\"}]}";                ObjectMapper mapper = new ObjectMapper();        //把json字符串转为对象        Object object = null;        try {            object = mapper.readValue(json, Object.class);        } catch (JsonParseException e) {            e.printStackTrace();        } catch (JsonMappingException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        System.out.println("JsonToObject-->"+object.toString());        //把对象转为json字符串        String objectjson = "";        try {            objectjson = mapper.writeValueAsString(object);        } catch (JsonProcessingException e) {            e.printStackTrace();        }        System.out.println("ObjectToJson-->"+objectjson);    }        public static void GsonTest() {        //{"MNG001":[{"ID":"1","PWD":"2"}],"MNG002":[{"FaultCode":"1","PWD":"3"}]}        String json = "{\"MNG001\":[{\"ID\":\"1\",\"PWD\":\"2\"}],\"MNG002\":[{\"FaultCode\":\"1\",\"PWD\":\"3\"}]}";                Gson gson = new Gson();        //把json字符串转对象        Object object = gson.fromJson(json, Object.class);        System.out.println("JsonToObject-->"+object.toString());        //把对象转json字符串        String objectjson = gson.toJson(object);        System.out.println("ObjectToJson-->"+objectjson);    }