servlet中zip文件下载问题

[wujinbao]

servlet中生成一zip流并下载到客户端，为何前两次下载的zip文件均不能打开直到第三个zip文件才能正确打开？

[wolfsquare]

没有出现过这种问题,也许是服务端相应太慢或者断开太快?
楼主可否贴代码看看?

[testjava]

没碰到过这么奇怪的问题？

[snowboy2003]

看这里，试一下这个:

ServletOutputStream out = response.getOutputStream();

request.setCharacterEncoding("GB2312");

String file="d:\\down\\"+request.getParameter("filename");

int BUFFER = 2048;

byte data[] = new byte[BUFFER];

BufferedInputStream origin = null;

FileInputStream fis = new FileInputStream(fileName);

int numRead=0;

int size=0;

origin = new BufferedInputStream(fis, BUFFER);

response.setContentType( "application/OCTET-STREAM" );

response.setHeader("Content-Disposition","attachment; filename="+request.getParameter("filename")+";");

while (numRead != -1) {

numRead= origin.read(data, 0, BUFFER);
out.write(data, 0, numRead);
size+=numRead;
}

origin.close();

[wujinbao]

原代码如下：
res.setHeader("Content-Disposition","attachment;filename=zipfile.zip");
res.setHeader("Connection","close");
res.setContentType("application/octet-stream");
ServletOutputStream out=response.getOutputStream();;
out = res.getOutputStream();
// 创建ZIP文件输出流
System.out.println("create zip stream");
ZipOutputStream zip = new ZipOutputStream(out);
String oln; byte [] byt;
while(rs.next())
{
String val = rs.getString("uid");
fname = val.substring(val.length() - 8)+".R12");
zip.putNextEntry(new ZipEntry(fname));
oln = "kjasdfijsdifjsdfj \r\n" ;
byt = oln.getBytes();
zip.write(byt, 0, byt.length);
zip.closeEntry();
}

zip.finish();
zip.close();

[amortal]

zip文件，直接给个联接就可以下载了呀！何必那么麻烦呢？
打开问题的话，就把method=get

[bruni]

res.setContentType("bin");

[conning333]

为什么第三次就行，我很奇怪，不懂