Json和对象互转

FastJson

public static void main(String[] args) {
    MjUserDTO mjUserDTO = new MjUserDTO();
    mjUserDTO.setId(Long.valueOf(120621));
    mjUserDTO.setUserId(Long.valueOf(120621));
    mjUserDTO.setNickName("qingshan");
    Integer bizId=2;
    Integer bizType=3;
    Map<String,String> map=new HashMap<>();
    map.put("bizId",String.valueOf(bizId));
    map.put("bizType",String.valueOf(bizType));
    map.put("mjUserDTO",JSON.toJSONString(mjUserDTO));
    String str = JSON.toJSONString(map);
    Map<String,String> parse = (Map)JSON.parse(str);
    String mjUserDTO1 = parse.get("mjUserDTO");
    MjUserDTO data = JSON.parseObject(mjUserDTO1,MjUserDTO.class);

    System.out.println(data.getNickName());
    
    //获取json字符串中深度层级的数据
    
    String jsonResult="{\n" +
                "  \"rspCode\": \"000000\",\n" +
                "  \"rspMsg\": \"操作完成\",\n" +
                "  \"debuggerErrorMsg\": null,\n" +
                "  \"resultData\": {\n" +
                "    \"token\": \"86988ae9-077c-4a3f-807d-39840403efc3\"\n" +
                "  }\n" +
                "}";
    JSONObject result = JSONObject.parseObject(jsonResult);
    JSONObject resultDataJson=result.getJSONObject("resultData");
    //如果还有更深层的再继续解析
    String token = resultDataJson.getString("token");

}

Jackson

@Test
void test1() throws JsonProcessingException {
    //对象转jsonstr
    StudentInfoDTO studentInfoDTO=new StudentInfoDTO();
    studentInfoDTO.setName("石银博");
    studentInfoDTO.setSex("男");
    studentInfoDTO.setAge(23);
    studentInfoDTO.setBeiZhu("备注");

    ObjectMapper mapper = new ObjectMapper();
    String result = mapper.writeValueAsString(studentInfoDTO);
    System.out.println(result);
}

@Test
void test2() throws JsonProcessingException {
    //jsonstr转对象
    String jsonStr="{\"name\":\"石银博\",\"sex\":\"男\",\"age\":23,\"beiZhu\":\"备注\"}";
    ObjectMapper mapper = new ObjectMapper();
    StudentInfoDTO studentInfoDTO = mapper.readValue(jsonStr, StudentInfoDTO.class);
    System.out.println(studentInfoDTO);
}

@Test
void test3() throws JsonProcessingException {
    //jsonstr转map
    String jsonStr="{\"name\":\"石银博\",\"sex\":\"男\",\"age\":23,\"beiZhu\":\"备注\"}";
    ObjectMapper mapper = new ObjectMapper();
   Map<String,Object> map= mapper.readValue(jsonStr, new TypeReference<Map<String,Object>>(){});
    System.out.println(map);
}