文件下载实现

java代码：

@RequestMapping(value = "/download")
	@ResponseBody
	public void download(HttpServletRequest request,
			HttpServletResponse response) throws FileNotFoundException {
		//获取服务器端文件保存路径
		String realPath = request.getSession().getServletContext().getRealPath("/");
		String path = realPath+"文件.txt";
		//下载
		try {
            // path是指欲下载的文件的路径。
            File file = new File(path);
            // 取得文件名。
            String filename = file.getName();
            // 取得文件的后缀名。
            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();

            // 以流的形式下载文件。
            InputStream fis = new BufferedInputStream(new FileInputStream(path));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            // 设置response的Header
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("gb2312"),"ISO8859-1"));
            response.addHeader("Content-Length", "" + file.length());
            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }

	}

window.location.href = encodeURI("forecast/download");

这样不用使用a标签来请求 直接在js中调用即可