调用url.openConnection().getInputStream()下载文件时报java.io.IOException

[ppmmwozuiai]

错误信息前两行是：
java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost/jsp/downloadtmp/126806114/6.zip
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

代码：

			try {
				URL url = new URL(BASE_URL + requestNumber + "/" + fileName);
				File outFile = new File(path + File.separator + fileName);
				os = new FileOutputStream(outFile);
				is = url.openConnection().getInputStream();
				byte[] buff = new byte[1024];
				while (true) {
					int readed = is.read(buff);
					System.out.println("--------------" + buff.length);
					if (readed == -1) {
						break;
					}
					byte[] temp = new byte[readed];
					System.arraycopy(buff, 0, temp, 0, readed);
					os.write(temp);
				}

			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				try {
					is.close();
					os.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}

不太明白为什么第五行会报错。。

[RAY_MAO]

Server returned HTTP response code: 401 只认识404 不认识 401了啊

[ppmmwozuiai]

我明白了。网站有身份验证。在调用之前必须现经过认证才行。

[tony4geek]

对的。应该设置身份认证/