新增：新增系统管理/部门管理/导出功能（引入 Easy Excel 依赖用于导出 Excel，详情可见 README 介绍。另请注意：测试导出功能时，前端需要关闭 mockjs，否则 responseType 会被 mockjs 设置为 ''，导致导出的文件无法打开）

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/util/ExcelUtils.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.common.util;
+
+import java.util.Date;
+import java.util.List;
+
+import javax.servlet.http.HttpServletResponse;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
+import com.esotericsoftware.minlog.Log;
+
+import cn.hutool.core.date.DateUtil;
+import cn.hutool.core.util.URLUtil;
+
+import top.charles7c.cnadmin.common.config.easyexcel.ExcelBigNumberConverter;
+import top.charles7c.cnadmin.common.exception.ServiceException;
+
+/**
+ * Excel 工具类
+ *
+ * @author Charles7c
+ * @since 2023/2/5 18:00
+ */
+@Slf4j
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class ExcelUtils {
+
+    /**
+     * 导出
+     *
+     * @param list
+     *            导出数据集合
+     * @param fileName
+     *            文件名
+     * @param clazz
+     *            导出数据类型
+     * @param response
+     *            响应对象
+     */
+    public static <V> void export(List<V> list, String fileName, Class<V> clazz, HttpServletResponse response) {
+        export(list, fileName, "Sheet1", clazz, response);
+    }
+
+    /**
+     * 导出
+     *
+     * @param list
+     *            导出数据集合
+     * @param fileName
+     *            文件名
+     * @param sheetName
+     *            工作表名称
+     * @param clazz
+     *            导出数据类型
+     * @param response
+     *            响应对象
+     */
+    public static <V> void export(List<V> list, String fileName, String sheetName, Class<V> clazz,
+        HttpServletResponse response) {
+        try {
+            fileName = String.format("%s_%s.xlsx", fileName, DateUtil.format(new Date(), "yyyyMMddHHmmss"));
+            fileName = URLUtil.encode(fileName);
+            response.setHeader("Content-disposition", "attachment;filename=" + fileName);
+            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
+            EasyExcel.write(response.getOutputStream(), clazz).autoCloseStream(false)
+                // 自动适配宽度
+                .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
+                // 自动转换大数值
+                .registerConverter(new ExcelBigNumberConverter()).sheet(sheetName).doWrite(list);
+        } catch (Exception e) {
+            Log.error("Export excel occurred an error.", e);
+            throw new ServiceException("导出 Excel 出现错误");
+        }
+    }
+}

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/util/ExceptionUtils.java

@@ -91,6 +91,17 @@ public class ExceptionUtils {
         return exToDefault(supplier, null, exConsumer);
     }
 
+    /**
+     * 如果有异常，返回空字符串
+     *
+     * @param exSupplier
+     *            可能会出现异常的方法执行
+     * @return /
+     */
+    public static String exToBlank(ExSupplier<String> exSupplier) {
+        return exToDefault(exSupplier, "");
+    }
+
     /**
      * 如果有异常，返回默认值
      *