feat(web): FileUploadUtils 新增文件下载方法

continew-starter-web/src/main/java/top/charles7c/continew/starter/web/util/FileUploadUtils.java

@@ -18,17 +18,23 @@ package top.charles7c.continew.starter.web.util;
 
 import cn.hutool.core.date.DatePattern;
 import cn.hutool.core.date.DateUtil;
+import cn.hutool.core.io.IoUtil;
 import cn.hutool.core.io.file.FileNameUtil;
 import cn.hutool.core.util.IdUtil;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.io.File;
+import java.io.FileInputStream;
 import java.time.LocalDateTime;
 
 /**
- * 文件上传工具类
+ * 文件工具类
  *
  * @author Zheng Jie（<a href="https://gitee.com/elunez/eladmin">ELADMIN</a>）
  * @author Charles7c
@@ -41,7 +47,7 @@ public class FileUploadUtils {
     }
 
     /**
-     * 上传文件
+     * 上传
      *
      * @param multipartFile          源文件对象
      * @param filePath               文件路径
@@ -51,7 +57,6 @@ public class FileUploadUtils {
     public static File upload(MultipartFile multipartFile, String filePath, boolean isKeepOriginalFilename) {
         String originalFilename = multipartFile.getOriginalFilename();
         String extensionName = FileNameUtil.extName(originalFilename);
-
         String fileName;
         if (isKeepOriginalFilename) {
             fileName = "%s-%s.%s".formatted(FileNameUtil.getPrefix(originalFilename), DateUtil.format(LocalDateTime
@@ -59,7 +64,6 @@ public class FileUploadUtils {
         } else {
             fileName = "%s.%s".formatted(IdUtil.fastSimpleUUID(), extensionName);
         }
-
         try {
             String pathname = filePath + fileName;
             File dest = new File(pathname).getCanonicalFile();
@@ -71,8 +75,35 @@ public class FileUploadUtils {
             multipartFile.transferTo(dest);
             return dest;
         } catch (Exception e) {
-            log.error("Upload file occurred an error: {}. fileName: {}.", e.getMessage(), fileName, e);
+            log.error(e.getMessage(), e);
         }
         return null;
     }
+
+    /**
+     * 下载
+     *
+     * @param request    请求对象
+     * @param response   响应对象
+     * @param file       文件
+     * @param autoDelete 下载后自动删除
+     */
+    public static void download(HttpServletRequest request,
+                                HttpServletResponse response,
+                                File file,
+                                boolean autoDelete) {
+        response.setCharacterEncoding(request.getCharacterEncoding());
+        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
+        response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + file.getName());
+        try (FileInputStream fis = new FileInputStream(file)) {
+            IoUtil.copy(fis, response.getOutputStream());
+            response.flushBuffer();
+        } catch (Exception e) {
+            log.error(e.getMessage(), e);
+        } finally {
+            if (autoDelete) {
+                file.deleteOnExit();
+            }
+        }
+    }
 }