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@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");

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