json与java对象互相转换

implementation 'com.alibaba:fastjson:1.2.78'

@Test
	void dtoEntityTest() {
		UserDTO user = new UserDTO("1", new Date(System.currentTimeMillis()), "REMORK");
		// dto转entity
		UserEntity userEntity = JSON.parseObject(JSON.toJSONString(user), UserEntity.class);
		// entity转dto
		UserDTO userDTO = JSON.parseObject(JSON.toJSONString(userEntity), UserDTO.class);
	}