ServletOutputStream out = null;
InputStream inputStream = null;
try {
// 獲取外部文件流
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(3 * 1000);
//防止屏蔽程序抓取而返回403錯誤
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
inputStream = conn.getInputStream();
/**
* 輸出文件到瀏覽器
*/
int len = 0;
// 輸出 下載的響應頭，如果下載的文件是中文名，文件名需要經過url編碼
response.setContentType("text/html;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("此處寫文件名", "UTF-8"));
response.setHeader("Cache-Control", "no-cache");
out = response.getOutputStream();
byte[] buffer = new byte[1024];
while ((len = inputStream.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
out.flush();
} catch (Exception e) {
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
}
}
if (out != null) {
try {
out.close();
} catch (Exception e) {
}
}
}