添加了TimeUtils工具类

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/Project.java

@@ -18,6 +18,7 @@ public class Project {
     @TableId(type = IdType.AUTO)
     private Integer projectId;
     private String projectName;
+    //TODO: 时间线顺序判断
     private LocalDate projectStartTime;
     private LocalDate projectOnlineTime;
     private LocalDate projectFirstTestTime;

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/utils/TimeUtils.java

@@ -0,0 +1,38 @@
+package cn.edu.hfut.rmdjzz.projectmanagement.utils;
+
+import java.time.Instant;
+import java.time.temporal.TemporalAccessor;
+
+/**
+ * @author 佘语殊
+ * @since 2022/7/2 9:13
+ */
+public class TimeUtils {
+    /**
+     * 验证参数是否按时间线先后顺序传入，忽略null
+     */
+    public static boolean validateTimeLine(TemporalAccessor... temporalAccessors) {
+        int first;
+        for (first = 0; first < temporalAccessors.length; first++) {
+            if (temporalAccessors[first] != null) {
+                break;
+            }
+        }
+        if (first >= temporalAccessors.length - 1) {
+            return true;
+        }
+        Instant last = Instant.from(temporalAccessors[first]);
+        Instant current;
+        for (int i = first + 1; i < temporalAccessors.length; i++) {
+            if (temporalAccessors[i] == null) {
+                continue;
+            }
+            current = Instant.from(temporalAccessors[i]);
+            if (last.isAfter(current)) {
+                return false;
+            }
+            last = current;
+        }
+        return true;
+    }
+}