Angularjs 不支持的媒体类型Spring ReST资源

我在我的Rest资源中定义了一个简单的方法，如下所示：

@RequestMapping(value = "/{studyId}/cases/{caseId}/exportlocation/{exportLocation}", method = RequestMethod.PUT)
@Timed
public void exportCase(@PathVariable Long studyId, @PathVariable Long caseId, @PathVariable String exportLocation,
        @RequestBody Case acase) throws Exception {
    log.debug("REST request to export Case {} for Study : {}", acase, studyId);
    String exportFileName = exportService.exportCase(acase, "test");
    // if (exportFileName == null) {
    // response.sendError(HttpServletResponse.SC_NOT_FOUND, "Can't Export");
    // }
    // return exportFileName;
}

当我在页面上打电话时，我可以看到URL为

/app/rest/studies/1/cases/1/exportlocation/test

我将请求映射定义为

@RequestMapping(value = StudyResource.REQUEST_MAPPING, produces = MediaType.APPLICATION_JSON_VALUE)
@Secured(AuthoritiesConstants.USER)
public class StudyResource {

    private final Logger log = LoggerFactory.getLogger(StudyResource.class);

    public static final String REQUEST_MAPPING = "/app/rest/studies";

但继续获取415不支持的媒体类型。有人能看一下代码行，告诉我出了什么问题吗。我非常感谢你的时间和帮助。 页面上调用的My JS层如图所示“

下面是JS服务部分

exportcase : $resource('app/rest/studies/:studyId/cases/:caseId/exportlocation/:exportLocation', {}, {
        'exportc' : {
            method : 'PUT',
            params : {
                studyId : '@studyId',
                caseId : '@caseId',
                exportLocation : '@exportLocation'
            }
        },
    })

---

你如何调用相关的URL？你能给我们看一下那段代码吗？[[Angular JS Service]]exportcase:$resource（'app/rest/studies/：studyId/cases/：caseId/exportlocation/：exportlocation'，{}，{'exportc'：{method:'POST'，params:{studyId:'@studyId'，caseId:'@caseId'，exportLocation:'@exportLocation'}，}，[[Angle Controller Call]]$scope.exportCase=函数（studyId，caseId，exportLocation）{StudyService.exportCase.exportc（{studyId:studyId，caseId:caseId，exportLocation:exportLocation}，$scope.acase，function（）{您需要将它添加到问题中，因为它很重要。只做了，但没有回答

exportcase : $resource('app/rest/studies/:studyId/cases/:caseId/exportlocation/:exportLocation', {}, {
        'exportc' : {
            method : 'PUT',
            params : {
                studyId : '@studyId',
                caseId : '@caseId',
                exportLocation : '@exportLocation'
            }
        },
    })