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);

    }