文件下载的Servlet-JSP教程,Jsp/Servlet

//文件下载的servlet

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

public class downloadfile extends httpservlet {

private static final string content_type = "text/html; charset=gbk";

//initialize global variables

public void init() throws servletexception {

}

//process the http post request

public void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {

response.setcontenttype(content_type);

string pathsavefile;//要下载的文件

string filename;//保存窗口中显示的文件名

filename=response.encodeurl(new string(filename.getbytes(),"iso8859_1"));//转码

try

{

response.reset();

response.setcontenttype("application/octet-stream");

response.setheader("content-disposition", "attachment; filename=\""+filename+"\"");

servletoutputstream out = response.getoutputstream();

inputstream instream=new fileinputstream(pathsavefile);

//循环取出流中的数据

byte[] b = new byte[1024];

int len;

while((len=instream.read(b)) >0)

out.write(b,0,len);

}

out.close();

instream.close();

}

catch (exception e)

{

system.out.println(e);

}

}

//clean up resources

public void destroy() {

}

}