修复页面覆盖率低的问题

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

@@ -962,7 +962,7 @@ public class AnalyzeService {
 				noBugPage++;
 			}
 		}
-		double pageCover=noBugPage*1.0/size;
+		double pageCover=1 - noBugPage*1.0/size;
 		AnalyseVO2 analyseVO=new AnalyseVO2(likeNum,dislikeNum,forkNum,reportNum,testCaseNum,bugNum,startTime,endTime,reportNum,taskName,workerDistribute,workerRank,gradeDistribution,pageCover);
 		StringBuffer managerCheckUrl = new StringBuffer("http://");
 		managerCheckUrl.append(serverHost).append(":").append(serverPort).append("/report/managerCheck/")