分页

src/main/java/com/zhangmeng/online/exam/controller/PermissionController.java

@@ -4,7 +4,12 @@ import com.zhangmeng.online.exam.dao.PermissionDao;
 import com.zhangmeng.online.exam.dto.Result;
 import com.zhangmeng.online.exam.entity.Permission;
 import com.zhangmeng.online.exam.entity.Role;
+import com.zhangmeng.online.exam.utils.PageUtils;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
@@ -25,9 +30,26 @@ public class PermissionController {
     @Autowired
     private PermissionDao permissionDao;
 
+    /**
+     * // 基本分页（无排序）
+     * Pageable pageable = PageRequest.of(0, 10);
+     *
+     * // 分页+排序（单字段）
+     * Pageable pageable = PageRequest.of(0, 10, Sort.Direction.DESC, "createTime");
+     *
+     * // 分页+多字段排序
+     * Sort sort = Sort.by(Sort.Order.asc("age"), Sort.Order.desc("name"));
+     * Pageable pageable = PageRequest.of(0, 10, sort);
+     * @param pageNum
+     * @param pageSize
+     * @return
+     */
     @RequestMapping("/list")
-    public Result list() {
+    public Result list(Integer pageNum, Integer pageSize) {
-        List<Permission> list = permissionDao.findAll();
+
+        Pageable pageable = PageRequest.of(PageUtils.getPageNum(pageNum), pageSize, Sort.Direction.DESC, "addTime");
+        Page<Permission> all = permissionDao.findAll(pageable);
+        List<Permission> list = all.getContent();
         List<Map<String, Object>> resultList = new ArrayList<>();
         for (Permission permission : list) {
             Map<String, Object> map = new HashMap<>();
@@ -37,6 +59,6 @@ public class PermissionController {
             map.put("url", permission.getUrl());
             resultList.add(map);
         }
-        return Result.success(resultList);
+        return Result.success(pageNum, pageSize, all.getTotalElements(), resultList);
     }
 }

src/main/java/com/zhangmeng/online/exam/controller/UserController.java

@@ -38,7 +38,7 @@ public class UserController {
     private EntityManager entityManager;
 
     @GetMapping("/list")
-    public Result userList() {
+    public Result userList(Integer pageNum,Integer pageSize) {
         List<User> list = userDao.findAll();
         List<Map<String, Object>> resultList = new ArrayList<>();
         for (User user : list) {

src/main/java/com/zhangmeng/online/exam/dto/Result.java

@@ -36,6 +36,17 @@ public class Result {
         this.data = data;
     }
 
+    public static Result success(int pageNum, int pageSize, long total, Object data) {
+        Result result = new Result();
+        result.setPageNum(pageNum);
+        result.setPageSize(pageSize);
+        result.setTotal(total);
+        result.setCode(SUCCESS);
+        result.setMessage("success");
+        result.setData(data);
+        return result;
+    }
+
     public static Result success(Object data) {
         Result result = new Result();
         result.setCode(SUCCESS);

src/main/java/com/zhangmeng/online/exam/utils/PageUtils.java

@@ -0,0 +1,21 @@
+package com.zhangmeng.online.exam.utils;
+
+/**
+ * @author zm
+ * @date 2025/3/14 16:36
+ * @version: 1.0
+ */
+public class PageUtils {
+
+    public static int getPageNum(Integer pageNum){
+        if (pageNum == null){
+            pageNum = 0;
+        }else if (pageNum <= 0){
+            pageNum = 0;
+        }else {
+            pageNum = pageNum - 1;
+        }
+        return pageNum;
+    }
+
+}