update 通过excel导入的时候增加对重复学号的校验

server-db/src/main/java/cn/exploring/engine/server/db/service/StudentInfoService.java

@@ -249,6 +249,12 @@ public class StudentInfoService {
         Map<String, StudentInfo> existStudent = selectStudentInfoByUniqueId(importVoList.stream().map(StudentInfoExcelImportVo::getStudentUid).filter(org.apache.commons.lang3.StringUtils::isNotBlank).collect(Collectors.toSet()))
                 .stream().collect(Collectors.toMap(StudentInfo::getStudentUniqueId, x -> x, (k1, k2) -> k1));
 
+        Set<String> duplicateStudentUid = importVoList.stream()
+                .map(StudentInfoExcelImportVo::getStudentUid)
+                .filter(org.apache.commons.lang3.StringUtils::isNotBlank)
+                .collect(Collectors.groupingBy(String::trim, Collectors.counting()))
+                .entrySet().stream().filter(entry -> entry.getValue() > 1).map(Map.Entry::getKey).collect(Collectors.toSet());
+
         Map<Integer, String> classNameMap = classService.listAll().stream().collect(Collectors.toMap(ClassInfo::getId, ClassInfo::getClassName));
 
         return importVoList.stream().map(vo -> {
@@ -256,6 +262,8 @@ public class StudentInfoService {
 
             if (org.apache.commons.lang3.StringUtils.isBlank(vo.getStudentUid())) {
                 err.add("学号不能为空");
+            } else if (duplicateStudentUid.contains(vo.getStudentUid().trim())) {
+                err.add("学号不能重复");
             }
 
             if (org.apache.commons.lang3.StringUtils.isBlank(vo.getName())) {