JSP文件下載（不使用jar包）

JSP文件下載（不使用jar包）

java代碼：

public class Download extends HttpServlet {

    public Download() {
        super();
    }

    public void destroy() {
        super.destroy(); // Just puts destroy string in log
        // Put your code here
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String path = D:/upload/哈哈哈.txt;
        try {
            // path是指欲下載的文件的路徑。
            File file = new File(path);
            // 取得文件名。
            String filename = file.getName();
            // 取得文件的後綴名。
            String ext = filename.substring(filename.lastIndexOf(.) + 1).toUpperCase();

            // 以流的形式下載文件。
            InputStream fis = new BufferedInputStream(new FileInputStream(path));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            // 設置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();
        }
    }

    public void init() throws ServletException {
        // Put your code here
    }

}