当前位置：首页 > news >正文

Java从resources文件下载文档,文档没有后缀名

news 2025/7/15 2:24:27

业务场景：因为公司会对excel文档加密，通过svn或者git上传代码也会对文档进行加密，所以这里将文档后缀去了，这样避免文档加密。

实现思路：将文档去掉后缀，放入resources下，获取输入流，最后加上后缀，前端成功下载

效果图

请添加图片描述

上代码

package com.***.util;import cn.hutool.core.util.StrUtil;
import org.springframework.core.io.ClassPathResource;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;/*** @author longwei* @Description excel帮助类* @date 2023/8/30 14:36*/
public class ExcelUtils {/*** 从静态资源下载文件** @param fileName 文件名,没有后缀* @param suffix   文件后缀* @param request  request* @param response response*/public static void downloadFileByLocalPath(HttpServletRequest request, HttpServletResponse response,String fileName, String suffix) throws Exception {if (StrUtil.isEmpty(fileName) || StrUtil.isEmpty(suffix)) {throw new RuntimeException("文件信息不能为空");}InputStream inputStream = new ClassPathResource("file" + File.separator + fileName).getInputStream();fileName = fileName + suffix;downFileByInputStream(request, response, inputStream, fileName);}public static void downFileByInputStream(HttpServletRequest request, HttpServletResponse response, InputStream inputStream, String fileName) throws Exception {byte[] buffer = new byte[1024];BufferedInputStream bis = null;OutputStream os = null;String finalFileName;try {final String userAgent = request.getHeader("USER-AGENT");//IE浏览器if (StrUtil.contains(userAgent, "MSIE") || StrUtil.contains(userAgent, "Trident")) {finalFileName = URLEncoder.encode(fileName, "UTF8");}//google,火狐浏览器else if (StrUtil.contains(userAgent, "Mozilla")) {finalFileName = new String(fileName.getBytes(), "ISO8859-1");}//其他浏览器else {finalFileName = URLEncoder.encode(fileName, "UTF8");}response.setCharacterEncoding("UTF-8");// 设置强制下载不打开response.setContentType("application/force-download");// 设置文件名response.addHeader("Content-Disposition", "attachment;fileName=" + finalFileName);bis = new BufferedInputStream(inputStream);os = response.getOutputStream();int i = bis.read(buffer);while (i != -1) {os.write(buffer, 0, i);i = bis.read(buffer);}} catch (Exception e) {e.printStackTrace();} finally {if (inputStream != null) {try {inputStream.close();} catch (Exception e) {e.printStackTrace();}}if (bis != null) {try {bis.close();} catch (Exception e) {e.printStackTrace();}}if (os != null) {try {os.flush();os.close();} catch (Exception e) {e.printStackTrace();}}}}}

controller层

    @RequestMapping("/downloadTemplate")public void downloadTemplate(HttpServletRequest request, HttpServletResponse response) {breedInfoService.downloadTemplate(request, response);}

service.impl层，这里直接用ExcelUtils方法

	@Overridepublic void downloadTemplate(HttpServletRequest request, HttpServletResponse response) {String fileName = "中药饮片导入模板";try {ExcelUtils.downloadFileByLocalPath(request, response, fileName, ".xlsx");} catch (Exception e) {log.error("下载中药饮片导入模板失败-{}", e.getMessage());throw new BusinessException("下载中药饮片导入模板失败,请联系管理员！");}}