json转换 - demo

public static void main(String[] args) {
    CommonQueryVO commonQueryVO1 = new CommonQueryVO();
    commonQueryVO1.setLabel("1");
    commonQueryVO1.setValue("2");
    CommonQueryVO commonQueryVO2 = new CommonQueryVO();
    commonQueryVO2.setLabel("1");
    commonQueryVO2.setValue("2");
    List<CommonQueryVO> list = new ArrayList<>();
    list.add(commonQueryVO1);
    list.add(commonQueryVO2);

    //实体转json
    String s = JsonUtils.objectToString(commonQueryVO1);
    System.out.println(s);
    String s1 = JSONObject.toJSONString(commonQueryVO1);
    System.out.println(s1);

    //json转实体
    JSONObject jsonObject = JSONObject.parseObject(s1);
    CommonQueryVO commonQueryVO3 = JSONObject.parseObject(s1, CommonQueryVO.class);
    System.out.println(jsonObject);
    System.out.println(commonQueryVO3);

    //list转json
    String s2 = JsonUtils.objectToString(list);
    System.out.println(s2);
    String s4 = JSONObject.toJSONString(list);
    System.out.println(s4);

    List<Map<String,Object>> list3 = new ArrayList<>();
    Map<String,Object> map = new HashMap<>();
    map.put("lable", "1");
    list3.add(map);

    String s3 = JSONArray.toJSONString(list3);
    System.out.println(s3);

    //json转list
    JSONArray jsonArray = JSONArray.parseArray(s2);
    System.out.println(jsonArray);
    List<CommonQueryVO> list1 = JSONArray.parseArray(s2, CommonQueryVO.class);
    System.out.println(list1);


    JSONArray jsonArray1 = JSONArray.parseArray(s3);
    //报黄
    List<Map<String,Object>> list4 = (List<Map<String,Object>>)JSONArray.parse(s3);
    System.out.println(jsonArray1);
    //报黄
    List<Map> maps = JSONArray.parseArray(s3, Map.class);
    System.out.println(maps);
    //报黄
    List<Map<String,Object>> list2 = JSONArray.parseObject(s3, List.class);
    System.out.println(list2);
    

}