HTTP协议文件下载

                                                 HTTP协议文件下载

Servlet如下：

import java.io.BufferedInputStream;

import java.io.IOException;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.ServletOutputStream;

public class FileDownloadServlet extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

        response.setContentType("text/html");

        response.setHeader("Cache-Control","no-cache");

        request.setCharacterEncoding("gbk");

        String realName = (String)request.getParameter("realName");

        String path = (String)request.getParameter("path");

        String type = (String)request.getParameter("type");

        String httpurl = "";

        realName = java.net.URLEncoder.encode(realName,"utf-8");

        response.addHeader("Content-Disposition", "attachment;filename="+ realName);

 

        URL url = new java.net.URL(httpurl);

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        connection.connect();

          BufferedInputStream bis = new BufferedInputStream(connection.

              getInputStream());

          int read = bis.read();

          ServletOutputStream sos = response.getOutputStream();

          while (read != -1) {

            sos.write(read);

            read = bis.read();

          }

          bis.close();

          sos.close();

  }

  public void doPost(HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

        doGet(request,response);

 }

}