jsp开发下载文件模块，谁有经验

ivaict 2003-03-30 12:20:53

要求下载文件到客户端

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ivaict 2003-03-31

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多谢多谢
我来实施

mengsky 2003-03-31

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import java.io.*;
public class FileDownLoad {

public FileDownLoad() {
}
public void fileDown(String aFileName,javax.servlet.http.HttpServletResponse response) throws Exception {
java.io.BufferedInputStream iin;
BufferedOutputStream dout;
try {
File ff=new File(aFileName);
if(!ff.exists()){
throw new Exception("对不起! 您下载的文件不存在");
}else{
byte[] buffer;
int length=(new Long(ff.length())).intValue();
buffer=new byte[length];
try{
iin=new BufferedInputStream(new java.io.FileInputStream(ff));
//设置类型和头信息
response.setContentType( "application/octet-stream" ); // MIME type for pdf doc
int pos=aFileName.lastIndexOf("/");
aFileName=aFileName.substring(pos+1);
response.setHeader("Content-disposition", "attachment; filename="+aFileName);
//传送数据
dout = new BufferedOutputStream( response.getOutputStream());
int once = 0;
int total = 0;
while ((total<length) && (once>=0)) {
once = iin.read(buffer,total,length);
total += once;
dout.write(buffer,0,length);
}
if(iin!=null){ iin.close();}
if(dout!=null){ dout.close();}
}catch(Exception ex){
throw new Exception("文件下载过程中出现错误! ");
}
}
}catch(Exception ex) {
throw new Exception("文件下载过程中出现错误! ");
}
}
}
--------------------
<%@ page import="java.io.*,SqlData,FileDownLoad,Utility,java.util.*"%><%@ page language="java" contentType="text/html;charset=gb2312"%><jsp:useBean id="fload" scope="page" class="FileDownLoad" /><%String username="";if (session.getValue("username")==null){%><script>window.open("/mail/webmail/login.htm","_top");</script><%}else{username=session.getValue("username").toString();}String cd=request.getRequestURI();cd=cd.substring(cd.lastIndexOf('/')+1);String path=application.getRealPath(cd);int lastSlash=path.lastIndexOf('\\');path=path.substring(0,lastSlash);String filename=path+"/mail/affix/"+username+"/"+request.getParameter("affixname");if(filename!=null) fload.fileDown(filename,response);%>
------------------
<a href="+java.net.URLEncoder.encode(RS.getString("filename"))+">RS.getString("filename")

download.jsp文件，请不要用硬回车，要一行写下来，修改相应的路经传递给FILEDOWNLOAD类就可以了

ivaict 2003-03-30