init

backend/src/main/java/com/zl/mjga/dto/PageResponseDto.java

@@ -0,0 +1,22 @@
+package com.zl.mjga.dto;
+
+import jakarta.annotation.Nullable;
+import lombok.*;
+
+@Data
+public class PageResponseDto<T> {
+  private long total;
+  private T data;
+
+  public PageResponseDto(long total, @Nullable T data) {
+    if (total < 0) {
+      throw new IllegalArgumentException("total must not be less than zero");
+    }
+    this.total = total;
+    this.data = data;
+  }
+
+  public static <T> PageResponseDto<T> empty() {
+    return new PageResponseDto<>(0, null);
+  }
+}