bug解决

mec-teacher/src/main/java/com/ym/mec/teacher/controller/TeacherManageController.java

@@ -108,11 +108,14 @@ public class TeacherManageController extends BaseController {
 
     @ApiOperation(value = "根据群编号，获取群组基本信息")
     @GetMapping("/course/findGroupById")
-    public Object findGroupById(Integer groupId){
-        if(null == groupId){
+    public Object findGroupById(String imGroupId){
+        if(null == imGroupId){
             return failed("参数校验错误");
         }
-        return succeed(classGroupService.findGroupById(groupId));
+        if (imGroupId.contains("S") || imGroupId.contains("I")){
+            imGroupId = imGroupId.substring(1);
+        }
+        return succeed(classGroupService.findGroupById(Integer.parseInt(imGroupId)));
     }
 
     @ApiOperation(value = "根据群编号，获取群组所有成员基本信息")