TypeReference使用笔记

1. JSON字符串反序列化对象

   @Slf4j
   public class TypeReferenceTest{
       @Test
       public void parseObject(){
           String jsonContent = "{\"code\":\"200\",\"message\":\"error message\",\"data\":\"hello world\"}" ;
           TypeReference<RestResponse<String>> typeReference = new TypeReference<>(){} ;
           RestResponse<String> response = JSON.parseObject(jsonContent, typeReference);
           log.info("====> response : {}", response);
       }
   }
   

2. RestTemplate返回值泛型转换

   @Slf4j
   public class ParameterizedTypeReferenceTest {
       private RestTemplate restTemplate = new RestTemplate();
   
       @Test
       public void exchange(){
           String url = "http://localhost:8080/user-service/hello/index" ;
           ParameterizedTypeReference<RestResponse<String>> typeReference =
                   new ParameterizedTypeReference<>() {} ;
           ResponseEntity<RestResponse<String>> exchange = 
                restTemplate.exchange(url, HttpMethod.GET, new HttpEntity<>(null), typeReference);
           RestResponse<String> retValue = exchange.getBody();
           log.info("ret value : {}", retValue);
       }
   }