【新增】分页参数拦截封装

src/main/java/com/corewing/app/common/page/PageContext.java

@@ -0,0 +1,23 @@
+package com.corewing.app.common.page;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+
+public class PageContext {
+    private static final ThreadLocal<Page<?>> PAGE_HOLDER = new ThreadLocal<>();
+
+    // 设置分页对象
+    public static void setPage(Page<?> page) {
+        PAGE_HOLDER.set(page);
+    }
+
+    // 泛型方法：获取指定类型的分页对象（消除警告）
+    @SuppressWarnings("unchecked")
+    public static <T> Page<T> getPage(Class<T> clazz) {
+        return (Page<T>) PAGE_HOLDER.get();
+    }
+
+    // 清除线程变量
+    public static void clear() {
+        PAGE_HOLDER.remove();
+    }
+}

src/main/java/com/corewing/app/common/page/PageInterceptor.java

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+package com.corewing.app.common.page;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import org.springframework.web.servlet.HandlerInterceptor;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class PageInterceptor implements HandlerInterceptor {
+
+    @Override
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
+        // 默认分页参数
+        int pageNum = 1;
+        int pageSize = 10;
+
+        // 从请求参数中获取分页信息
+        String current = request.getParameter("current");
+        String size = request.getParameter("size");
+
+        // 解析页码
+        if (current != null && !current.isEmpty()) {
+            try {
+                pageNum = Integer.parseInt(current);
+                if (pageNum < 1) pageNum = 1; // 页码不能小于1
+            } catch (NumberFormatException e) {
+                // 非法参数使用默认值
+            }
+        }
+
+        // 解析每页条数
+        if (size != null && !size.isEmpty()) {
+            try {
+                pageSize = Integer.parseInt(size);
+                if (pageSize < 1) pageSize = 10; // 每页条数不能小于1
+                if (pageSize > 100) pageSize = 100; // 限制最大条数
+            } catch (NumberFormatException e) {
+                // 非法参数使用默认值
+            }
+        }
+
+        // 创建 MyBatis-Plus 的 Page 对象并存储到 ThreadLocal
+        Page<?> page = new Page<>(pageNum, pageSize);
+        PageContext.setPage(page);
+        return true;
+    }
+
+    @Override
+    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
+        // 清除ThreadLocal中的数据，防止内存泄漏
+        PageContext.clear();
+    }
+}