Spring WebTestClient JSON LocalDate解码

Question

在Spring Boot2.0.1中使用WebTestClient时，我会得到不同格式的日期，这取决于我绑定测试客户端的方式，请参见下面的代码。

那么，如何让WebTestClient.bindToController返回格式化为2018-04-13的LocalDate呢？当我调用WebTestClient.bindToServer()时，我得到了预期的格式。

@RestController
public class TodayController {
  @GetMapping("/today")
  public Map<String, Object> fetchToday() {
    return ImmutableMap.of("today", LocalDate.now());
  }
}

测试：

@ExtendWith({SpringExtension.class})
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class TodayControllerTest {

  @LocalServerPort
  private int randomPort;

  @Autowired
  private TodayController controller;

  @Test
  void fetchTodayWebTestClientBoundToController() {
     WebTestClient webTestClient = WebTestClient.bindToController(controller)
        .configureClient()
        .build();
    webTestClient.get().uri("/today")
        .exchange()
        .expectBody()
        .json("{\"today\":[2018,4,13]}");
}

@Test
void fetchTodayWebTestClientBoundToServer() {
    WebTestClient webTestClient = WebTestClient.bindToServer()
        .baseUrl("http://localhost:" + randomPort)
        .build();

    webTestClient.get().uri("/today")
        .exchange()
        .expectBody()
        .json("{\"today\":\"2018-04-13\"}");
}

Answer 1

事实证明，在使用WebTestClient.bindToController时，我需要设置杰克逊解码器/编码器。例如：

@Test
  public void fetchTodayWebTestClientBoundToController() {
     WebTestClient webTestClient = WebTestClient.bindToController(controller)
         .httpMessageCodecs((configurer) -> {
             CodecConfigurer.DefaultCodecs defaults = configurer.defaultCodecs();
             defaults.jackson2JsonDecoder(new Jackson2JsonDecoder(objectMapper, new MimeType[0]));
             defaults.jackson2JsonEncoder(new Jackson2JsonEncoder(objectMapper, new MimeType[0]));
         })
        .configureClient()
        .build();
    webTestClient.get().uri("/today")
        .exchange()
        .expectBody()
        .json("{\"today\":\"2018-04-30\"}");
  }

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