修改和学姐的接口，添加@requestParam接口

src/main/java/edu/nju/controller/ReviewPaperController.java

@@ -153,7 +153,7 @@ public class ReviewPaperController {
 
     @RequestMapping(value = "/getPaperByWorker")
     @ResponseBody
-    public String getPaperByWorker(String examId, String caseId, String workerIndex ){
+    public String getPaperByWorker(@RequestParam String examId,@RequestParam String caseId, @RequestParam String workerIndex ){
         String url=reviewPaperService.getWorkerPaperUrl(workerIndex,examId,caseId);
         return url;
     }