Listfiles.jsp-----DownloaServlet.java

[java]
package com.hbsi.servlet;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownloadServlet extends HttpServlet {

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

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

        filename = new String(filename.getBytes("iso8859-1"),"UTF-8");
        System.out.println(filename);

        //找到该文件所在的文件夹位置
        //String savepath = this.getFileSavePath(filename); //现在的文件名是UUID
        String savepath = this.getFileSavePath(this.getRealName(filename));

        File f = new File(savepath+"\\"+filename);

        if(!f.exists()){
            request.setAttribute("message","下载的资源不存在");
            request.getRequestDispatcher("/message.jsp").forward(request, response);

        }

        response.setHeader("content-disposition","attachment;filename="+URLEncoder.encode(this.getRealName(filename),"UTF-8"));

        FileInputStream in = new FileInputStream(f);
        byte[] buf = new byte[1024];
        int len=0;

        OutputStream out = response.getOutputStream();
        while((len=in.read(buf))>0){
            out.write(buf,0,len);
        }
        in.close();




    }
    public String getFileSavePath(String filename){

        int dir1 = filename.hashCode()&0xf;
        int dir2 = (filename.hashCode()>>4)&0xf;
        String savepath = this.getServletContext().getRealPath("/WEB-INF/upload")+"\\"+dir1+"\\"+dir2;


        return savepath;
    }
    public String getRealName(String filename){
        String realName = filename.substring(filename.indexOf("_")+1);
        return realName;
    }


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

        doGet(request, response);
    }

}

补充：软件开发 , Java ,