SpringMVC实现文件下载功能（文件导出功能）

梦里梦外; 2022-05-09 03:48 274阅读 0赞

1.页面代码

2.后台代码

@RequestMapping("downloadWhiteListTmp")  
        public ResponseEntity<byte[]> downloadWhiteListTmp(HttpServletRequest request) {  
        	
            HttpHeaders headers = new HttpHeaders();
            String fileName="importVehicleWhitelist.xls";
            ServletContext servletContext = request.getServletContext();
            String realPath = servletContext.getRealPath("/bwlmm/templateFiles/"+fileName); 
            File file = new File(realPath);
            InputStream in;
            byte[] body=null;
            ResponseEntity<byte[]> response =null;
    		try {
    			in = new FileInputStream(new File(realPath));
    		        body=new byte[in.available()];// 返回下一次对此输入流调用的方法可以不受阻塞地从此输入流读取（或跳过）的估计剩余字节数
    		        in.read(body);//读入到输入流里面
    		       fileName=new String(fileName.getBytes("gbk"),"iso8859-1");//防止中文乱码
    		       headers.add("Content-Disposition", "attachment;filename="+fileName);
    		       HttpStatus statusCode = HttpStatus.OK;//设置响应吗
    		       response =new ResponseEntity<byte[]>(body, headers, statusCode);
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		}//将该文件加入到输入流之中
    		catch (IOException e) {
    			e.printStackTrace();
    		}
           return response;
        }

3.说明

我的文件路径

![70][]

[70]: /images/20220509/0ae99eb5bd3d45eba1d06797809d7586.png