背景描述：在用Struts實現文件下載
實現：代碼如下，但是在Action中返回的必須是ActionMapping的null對象(即： return null;)
private void outputFile(HttpServletResponse response, File file) throws IOException
{
//回覆響應給用戶文件下載對話框
response.setHeader("Content-disposition", "attachment;filename=" + FILE_NAME);
byte[] b = new byte[100];
OutputStream os = response.getOutputStream();
FileInputStream fileInS = new FileInputStream(file);
int n;
while((n = fileInS.read(b)) != -1)
{
os.write(b, 0, n);
}
fileInS.close();
os.close();
}
