springmvc文件下载

@RequestMapping("/download")  
	public void download(HttpServletResponse res ,HttpServletRequest req) throws IOException {  
	    OutputStream os = 域名utputStream();  
	    try {  
	        域名t();  
	        域名eader("Content-Disposition", "attachment; filename=域名");  
	        域名ontentType("application/octet-stream; charset=utf-8");  
	        域名e(域名FileToByteArray(getDictionaryFile(req)));  
	        域名h();  
	    } finally {  
	        if (os != null) {  
	            域名e();  
	        }  
	    }  
	}  
	
	 private File getDictionaryFile(HttpServletRequest req) {
		File file =new File(域名ession().getServletContext().getRealPath("/WEB-INF/域名"));
		return file;
	}

http://域名/topic/1125784