我有一个文件夹，我正在尝试压缩它，而不是在按钮单击事件上，它应该下载到用户的机器上。我能够正确生成 zip 文件。我已经编写了代码来下载它，但是在它从服务器下载到用户的机器之后。它显示无法打开 zip 文件，因为它是无效的。
这是如何引起的，我该如何解决？这是执行下载功能的代码。
public String getAsZip() {
try {
FacesContext ctx = FacesContext.getCurrentInstance();
ExternalContext etx = ctx.getExternalContext();
HttpServletResponse response = (HttpServletResponse) etx
.getResponse();
ServletOutputStream zipFileOutputStream = response
.getOutputStream();
response.setContentType("application/octet-stream");
response.setHeader(
"Content-Disposition",
"attachment; filename=" + downloadLink.substring(downloadLink.lastIndexOf("\\") + 1,downloadLink.length()));
response.setHeader("Cache-Control", "no-cache");
File zipFile = new File(downloadLink);
FileInputStream stream = new FileInputStream(zipFile);
response.setContentLength(stream.available());
int length = 0;
byte[] bbuf = new byte[response.getBufferSize()];
BufferedInputStream in = new BufferedInputStream(stream);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while ((length = in.read(bbuf)) > 0) {
baos.write(bbuf, 0, length);
}
zipFileOutputStream.write(baos.toByteArray());
zipFileOutputStream.flush();
zipFileOutputStream.close();
response.flushBuffer();
in.close();
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
return "successZip";
}