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springBOOT/MVC文件下载

书坊尚 2022-02-18 阅读 74

一 页面

<a href="${ctx}/download.do?filename=${item.path}&id=${item.id}">
			                                                                              下载
 </a>```
 -- 后台
 

```java
 /**
	  * 文件下载
	  * @param request
	  * @param filename
	  * @param model
	  * <byte[]> 泛型(泛指任意一种类型)
	  * @return
	  * @throws Exception
	  * @author qq  
	  */
	 @RequestMapping(value="/download.do")
	 public ResponseEntity<byte[]> download(HttpServletRequest request,
			 @RequestParam("filename") String filename,@RequestParam("upId") int upId,
			 Model model,ResouresUpload resoures)throws Exception {
		    request.setCharacterEncoding("UTF-8");
		    //文件存放位置
		    //String filePath = request.getSession().getServletContext().getRealPath("/fileStorage/");//文件存放位置
			//下载文件路径
		    String path = request.getSession().getServletContext().getRealPath("/");
			File file = new File(path + File.separator + filename);//文件路径分割
			System.out.println("file文件路径:"+file);
	        HttpHeaders headers = new HttpHeaders();//http请求头 
	        //下载显示的文件名,解决中文名称乱码问题  
	        String downloadFielName = new String(filename.getBytes("UTF-8"),"iso-8859-1");
	        System.out.println("下载的文件名称:"+downloadFielName);
	        //通知浏览器以attachment(下载方式)打开图片
	        headers.setContentDispositionFormData("attachment", downloadFielName); 
	        //application/octet-stream : 二进制流数据(最常见的文件下载)。
	        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);//octet stream
		    //下载成功后更新下载次数
	        resoures.setUpId(upId);
	        ResouresUpload rs=resService.findResouresUploadById(resoures);
	        int download_count=rs.getCount();//根据id获取下载次数
	        ResouresUpload resoures1=new ResouresUpload();
	        resoures1.setCount(download_count+1);//下载成功后则在原先的基础上+1;
	        resoures1.setUpId(upId);
	        boolean bol=resService.updateResouresUploadId(resoures1);//更新下载次数
	        
         return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);  
        
	 }
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