JSP实现文件下载---源码

package com.cdd.servlet; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.jspsmart.upload.SmartUpload; public class DownServlet extends HttpServlet { /** * Constructor of the object. */ public DownServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /** * The doPost method of the servlet. <br> * This method is called when a form has its tag value method equals to * post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String downfilename = request.getParameter("path"); //获取请求的文件地址 try { String filename = new String(downfilename.getBytes("gbk"), "ISO-8859-1"); if ((downfilename != null) && (filename != null)) { //判断要下载的文件是否为空 SmartUpload mydown = new SmartUpload(); mydown.initialize(getServletConfig(), request, response); //使用初始化方法 mydown.setContentDisposition(null); //弹出”文件下载“对话框 mydown.downloadFile(downfilename, filename); //调用文件下载方法 } } catch (Exception e) { RequestDispatcher rd = request.getRequestDispatcher("/index.jsp"); rd.forward(request, response); } } /** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */ public void init() throws ServletException { // Put your code here } }