我試圖在 spring boot 中將枚舉值作為標(biāo)頭參數(shù)提供給我的其余端點(diǎn)@RestController。為此，我將杰克遜庫(kù)放入我的build.gradle文件中，因?yàn)樽詣?dòng)生成的枚舉使用了杰克遜注釋。我無(wú)法更改枚舉代碼（它是根據(jù) openapi 規(guī)范自動(dòng)生成的）。它看起來(lái)像這樣：public enum DocumentTypes {  APPLICATION_PDF("application/pdf"),  APPLICATION_RTF("application/rtf"),  APPLICATION_VND_OASIS_OPENDOCUMENT_TEXT("application/vnd.oasis.opendocument.text"),  APPLICATION_VND_OPENXMLFORMATS_OFFICEDOCUMENT_WORDPROCESSINGML_DOCUMENT("application/vnd.openxmlformats-officedocument.wordprocessingml.document"),  APPLICATION_VND_MS_WORD("application/vnd.ms-word"),  TEXT_HTML("text/html"),  TEXT_PLAIN("text/plain");  private String value;  DocumentTypes(String value) {    this.value = value;  }  @Override  @JsonValue  public String toString() {    return String.valueOf(value);  }  @JsonCreator  public static DocumentTypes fromValue(String text) {    for (DocumentTypes b : DocumentTypes.values()) {      if (String.valueOf(b.value).equals(text)) {        return b;      }    }    throw new IllegalArgumentException("Unexpected value '" + text + "'");  }}我用來(lái)測(cè)試的其余控制器如下所示：@RestController@RequestMapping("/test")public class TestController {    @Autowired    private ObjectMapper objectMapper;    @RequestMapping(path = "", method = RequestMethod.GET)    public void test(@RequestHeader(value = "Accept", required = false) DocumentTypes targetFormat) throws IOException {        DocumentTypes value = objectMapper.readValue("\"application/pdf\"", DocumentTypes.class);    }}如果我不提供 Accept 標(biāo)頭，而只是在代碼中中斷，我可以看到代碼的第一行工作正常，字符串a(chǎn)pplication/pdf被轉(zhuǎn)換為，value因此ObjectMapper使用該方法完成了它的工作@JsonCreator。