uploadPaper的时候如果paperJson包含paper_id字段且有效，直接用以前的paper不再新建

src/main/java/edu/nju/service/ReviewPaperService.java

@@ -117,6 +117,13 @@ public class ReviewPaperService {
         JSONObject object = new JSONObject();
         try {
             JSONObject jsonObject = new JSONObject(paperJson);
+            if(jsonObject.has("paper_id")){
+                String paperId=jsonObject.getString("paper_id");
+                if(reviewPaperDao.findPaper(paperId)!=null){
+                    object.put("status","success");
+                    object.put("paperId",paperId);
+                }
+            }
             ReviewPaperVO reviewPaperVO = getReviewPaperVO(jsonObject);
             reviewPaperVO.setCreate_time(Long.toString(System.currentTimeMillis()));
             ReviewPaper reviewPaper = new ReviewPaper(reviewPaperVO);

src/main/java/paperjson

@@ -1,8 +1,8 @@
 {
-	"description": "job描述ddd",
+	"description": "job??ddd",
 	"name": "jobname",
 	"create_time":"2019/10/02",
-	"type":"漏洞扫描分析",
+	"type":"??????",
 	"application_url":"url1",
 	"requirement_url":"url2",
 	"item_group_list": [{