Java URLConnection openStream（）FileNotFoundException

我正在尝试通过与ftp服务器的URL连接访问文件。我用于检索文件并读取的代码是：

URL ftpurl = new URL("ftp://username:password@xxx.xxx.xxx.xxx/home/appuser/LoginCheck/cpuLive.log");
URLConnection connection = ftpurl.openConnection();
connection.connect();
InputStream input = new BufferedInputStream(ftpurl.openStream());
System.out.println(input);

但我得到一个FileNotFound异常：

Exception in thread "main" java.io.FileNotFoundException: home/appuser/LoginCheck/cpuLive.log
    at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream(Unknown Source)
    at java.net.URL.openStream(Unknown Source)
    at com.djblogin.codes.ProcessAll.processLogin(ProcessAll.java:413)
    at com.djblogin.codes.ProcessAll.processOperations(ProcessAll.java:39)
    at com.djblogin.codes.LoginCheck.main(LoginCheck.java:14)

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当我在浏览器中给出相同的URL时，我可以检索文件。请提供帮助。

可能重复您是否尝试在浏览器中输入该url？它说什么？它检索文件cpuLive.log看看Apache公共网络库