Listfiles.jsp-----DownloaServlet

[java]

package comhbsiservlet;

import javaioFile;

import javaioFileInputStream;

import javaioIOException;

import javaioOutputStream;

import URLEncoder;

import javaxservletServletException;

import javaxservlethttpHttpServlet;

import javaxservlethttpHttpServletRequest;

import javaxservlethttpHttpServletResponse;

public class DownloadServlet extends HttpServlet {

public void doGet(HttpServletRequest request HttpServletResponse response)

throws ServletException IOException {

String filename = requestgetParameter(filename);

filename = new String(filenamegetBytes(iso)UTF);

Systemoutprintln(filename);

//找到该文件所在的文件夹位置

//String savepath = thisgetFileSavePath(filename); //现在的文件名是UUID

String savepath = thisgetFileSavePath(thisgetRealName(filename));

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

if(!fexists()){

requestsetAttribute(message下载的资源不存在);

requestgetRequestDispatcher(/messagejsp)forward(request response);

}

responsesetHeader(contentdispositionattachment;filename=+URLEncoderencode(thisgetRealName(filename)UTF));

FileInputStream in = new FileInputStream(f);

byte[] buf = new byte[];

int len=;

OutputStream out = responsegetOutputStream();

while((len=inread(buf))>){

outwrite(buflen);

}

inclose();

}

public String getFileSavePath(String filename){

int dir = filenamehashCode()&xf;

int dir = (filenamehashCode()>>)&xf;

String savepath = thisgetServletContext()getRealPath(/WEBINF/upload)+\\+dir+\\+dir;

return savepath;

}

public String getRealName(String filename){

String realName = filenamesubstring(filenameindexOf(_)+);

return realName;

}

public void doPost(HttpServletRequest request HttpServletResponse response)

throws ServletException IOException {

doGet(request response);

}

}