Question

我是Java和创建API的新手。我试图简单地发出POST请求并返回特定值。这是我的代码：

@Service
@AllArgsConstructor
public class WebService {

    private RestTemplate restTemplate;
    private static final String PROJECT_URL = "http://localhost:8080/project";

    public ResponseEntity<ProjectResponse> createProject(Project project) {
        ResponseEntity<ProjectResponse> completeProject = restTemplate.postForEntity(PROJECT_URL, project, ProjectResponse.class);
        System.out.println("Response body " + completeProject.getBody());
        return completeProject;
    }

}

ProjectResponse类仅具有：

@Data
@NoArgsConstructor
public class ProjectResponse {
    private String id;
}

问题是idaøwaus返回为（id = null）。即使当我使用“字符串”而不是ProjectResponse时，一切正常，并且我看到ID已创建。因此，由于某种原因，将响应映射到ProjectResponse类存在问题。

有人知道怎么了吗？

Answer 1

尝试一下，使您的projectPesponse类与project相同。

@Service
@AllArgsConstructor
public class WebService {

    private RestTemplate restTemplate;
    private static final String PROJECT_URL = "http://localhost:8080/project";

    public ResponseEntity<Project> createProject(Project newProject) {
        Project completeProject = restTemplate.postForObject(PROJECT_URL, newProject, Project.class);
        log("Response body " + completeProject.getBody());//Log this instead
         return ResponseEntity.ok(completeProject);
    }

}

Answer 2

尝试此操作并在此处处理异常，以创建类ResponseErrorHandler并实现ResponseErrorHandler（i）

@Component
public class WebService {

private RestTemplate restTemplate;
private static final String PROJECT_URL = "http://localhost:8080/project";

public ProjectResponse createProject(Project project) {

ProjectResponseErrorHandler errorHandler = new ProjectResponseErrorHandler(
project.getId());
    restTemplate.setErrorHandler(errorHandler);
    ResponseEntity<ProjectResponse> completeProject = restTemplate.postForEntity(PROJECT_URL, project, ProjectResponse.class);
  log("Response body " + completeProject.getBody());
    return completeProject.getBody();
}
}

为什么ResponseEntity主体返回null？

2 个答案: