java下载文件中文乱码情况解决方法

雨点打透心脏的1/2处 2022-06-08 06:44 441阅读 0赞

@RequestMapping(value="/downfile",method=RequestMethod.GET)
    	public String download(String filename,HttpServletRequest req,HttpServletResponse res) throws UnsupportedEncodingException
    	{
    		filename = new String(filename.getBytes("iso-8859-1"),"utf-8");
    		 System.out.println(filename+"******");
    		String realpath=req.getSession().getServletContext().getRealPath("down");
    		File file = new File(realpath+"/"+filename);
    		if(file.exists())
    		{
    			//下载  读 输入流 ---》（写响应流）客户端
    			
    			res.setContentType("application/octet-stream");
    			 String headerValue = "attachment;";
    			  headerValue += " filename=\"" + encodeURIComponent(filename) +"\";";
    			  headerValue += " filename*=utf-8''" + encodeURIComponent(filename);
    			res.addHeader("Content-Disposition", headerValue);
    			try {
    				FileInputStream is=new FileInputStream(file);
    				byte[] arr=new byte[is.available()];
    				is.read(arr);
    				
    				//写到响应流
    				OutputStream os=res.getOutputStream();
    				os.write(arr);
    				
    				os.close();
    				is.close();
    				
    			} catch (FileNotFoundException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			
    		}
    		return "downsucc";
    	}
    	
    	public static String encodeURIComponent(String value) {
    		  try {
    		    return URLEncoder.encode(value, "UTF-8").replaceAll("\\+", "%20");
    		  } catch (UnsupportedEncodingException e) {
    		    e.printStackTrace();
    		    return null;
    		  }
    	}

获取路径的方法：

InputStream path = TestDemo.class.getClassLoader().getResourceAsStream("../down/js.pdf");

String path = TestDemo.class.getResource(“/test.txt”).getPath();

String path = Thread.currentThread().getContextClassLoader().getResource("/js.pdf").getFile();

String path = request.getSession().getServletContext().getRealPath("down/js.psd");