java文件下载和在线打开

/**
	 * @author chenzheng
	 * @since 2013-9-10
	 * @Description: java下载
	 * @throws
	 * @param filePath
	 * @param response
	 * @param isOnLine
	 * @throws Exception
	 * void
	 */
	public void downLoad() throws Exception {
		String paths=ServletActionContext.getServletContext().getRealPath("/");
		System.out.println(paths);
		String filePath="F:\\哈哈.txt";
		boolean isOnLine=false;
		HttpServletResponse response = ServletActionContext.getResponse();
		response.setCharacterEncoding("utf-8");
        File f = new File(filePath);
        if (!f.exists()) {
            response.sendError(404, "File not found!");
            return;
        }
        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
        byte[] buf = new byte[1024];
        int len = 0;
        response.reset(); // 非常重要
        String filename=new String(f.getName().getBytes("gbk"),"iso-8859-1");
        if (isOnLine) { // 在线打开方式
            URL u = new URL("file:///" + filePath);
            response.setContentType(u.openConnection().getContentType());
            response.setHeader("Content-Disposition", "inline; filename=" + f.getName());
            // 文件名应该编码成UTF-8
        } else { // 纯下载方式
            response.setContentType("application/x-msdownload");
            response.setHeader("Content-Disposition", "attachment; filename=" +filename );
        }
        OutputStream out = response.getOutputStream();
        while ((len = br.read(buf)) > 0)
            out.write(buf, 0, len);
        br.close();
        out.close();
    }