java - API方法可以返回不同的类型，我如何定义返回类型？

Question

I have the following API method:

  @GetMapping
  public ResponseEntity<List<Project>> getProjects(@RequestParam(required = false) String userName, @RequestParam(required = false) boolean additionalInfo) {
    return ResponseEntity.ok(projectService.getProjects(userName, additionalInfo));
  }

当前返回 ResponseEntity<List<Project>> 。但如果可选参数 additionalInfo是真的，我想返回 ResponseEntity<List<ProjectAdditionalInfoDTO>> 。我如何定义返回类型以表明它们都可以返回？当然我可以使用ResponseEntity<?> ，但那会很难看。

Answer 1

我会让事情变得简单，只是将事情分成两个单独的 Controller 方法......例如

@GetMapping
public ResponseEntity<List<Project>> getProjects(@RequestParam(required=false) String userName) {
    //...
}

@GetMapping
public ResponseEntity<List<ProjectAdditionalInfoDTO>> getProjectsWithAdditionalInfos(@RequestParam(required=false) String userName, @RequestParam(required=true) boolean additionalInfo) {
    //...
}