嗨,我正在尝试从服务器下载文件,但是在我的过程结束时,我最终在浏览器中只看到数字和一些奇怪的字符。它没有下载文件。我正在使用seam和JSF 1.2。
这是我的代码:
public void writeBytesToResponse(UploadDefinition _instance, String path) {
FacesContext context = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse) context .getExternalContext().getResponse();
try {
byte[] bytes = getFile(path);
response.reset();
response.setContentType(ContentType.PDF.getLabel());
response.setContentLength(bytes.length);
response.setHeader("Content-disposition", "attachment; filename=\"" + _instance.getFileName() + "\"");
OutputStream outputStream = response.getOutputStream();
outputStream.write(bytes);
outputStream.flush();
outputStream.close();
context.responseComplete();
} catch (Exception ex) {
ex.printStackTrace();
}
}
@SuppressWarnings("resource")
public byte[] getFile(String filePath) throws FileNotFoundException, IOException {
File file = new File(filePath);
InputStream is = new FileInputStream(file);
long length = file.length();
if (length > Integer.MAX_VALUE) {
throw new IOException("File is too large " + file.getName());
}
byte[] bytes = new byte[(int) length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
if (offset < bytes.length) {
throw new IOException("Could not completely read file " + file.getName());
}
is.close();
return bytes;
}
我在这里调用该方法:
public void downloadFile() {
writeBytesToResponse(ud, path);
}
我得到了答案,我<a4j:commandButton>
在jsf上使用,<h:commandButton>
然后将其更改为可以正常工作。关键是不要使用ajax。
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