fix(question): 修复题目答案验证逻辑

web-domain/src/main/java/com/zcloud/edu/domain/model/resource/QuestionE.java

@@ -145,6 +145,10 @@ public class QuestionE extends BaseE {
                         errList.add("单选题第" + (i + 2) + "行分值不能为空");
                     }
                 }
+                //单选题答案只能是ABCD四个中的一个，不能多个
+                if (!entity.getAnswer().matches("[A-D]") ||entity.getAnswer().length()>1) {
+                    errList.add("单选题第" + (i + 2) + "行答案错误");
+                }
             }
         }
         if (CollUtil.isNotEmpty(videoMultiselectList)) {
@@ -180,6 +184,12 @@ public class QuestionE extends BaseE {
                         errList.add("多选题第" + (i + 2) + "行分值不能为空");
                     }
                 }
+                String answer = entity.getAnswer().toUpperCase().trim();
+                //多选题答案只能是选题答案只能是ABCD四个中的值，可以多个
+                if (answer.matches("^[A-D]{2,4}$") && ! hasDuplicateChars(answer)) {
+                    errList.add("多选题第" + (i + 2) + "行答案错误");
+                }
+
             }
         }
         if (CollUtil.isNotEmpty(videoJudgeList)) {
@@ -208,6 +218,10 @@ public class QuestionE extends BaseE {
                         }
                     }
                 }
+                //判断题答案只能是AB中的一个
+                if (!entity.getAnswer().matches("[A-B]") ||entity.getAnswer().length()>1) {
+                    errList.add("单选题第" + (i + 2) + "行答案错误");
+                }
             }
         }
 
@@ -289,5 +303,18 @@ public class QuestionE extends BaseE {
         return questionEList;
 
     }
+    public static boolean hasDuplicateChars(String str) {
+        if (str == null || str.length() <= 1) {
+            return false;
+        }
+        for (int i = 0; i < str.length(); i++) {
+            for (int j = i + 1; j < str.length(); j++) {
+                if (str.charAt(i) == str.charAt(j)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
 
 }