在java应用程序中使用ftp4j库下载/上载时出现FTP错误

Question

我想在java应用程序中下载一个文件,当我尝试它时,它会在我的硬盘驱动器上创建该文件但无法完全下载它.我正在使用ftp4j库来做到这一点.

import it.sauronsoftware.ftp4j.*;
public class Main {
public static void main (String args[]){
    FTPClient client = new FTPClient();
    try{
    client.connect("ftp.myaddress.comlu.com");
    client.login("username", "password");
    System.out.println("Connection created");
    client.download("public_html/ZScreen.png", new java.io.File("d:/xxx/ZScreen.png"));
    System.out.println("Download successful");
    client.disconnect(true);
    }
    catch (Exception FTPException){
    System.out.println("Shit hit the fan");
    }
}
}

我总是创建Connection并且Shit击中粉丝.此外,我的硬盘驱动器上创建了一个文件,但它的大小为0字节.

这是堆栈竞赛

Connection created
java.net.SocketException: Connection reset
Shit hit the fan
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
at sun.nio.cs.StreamDecoder.read0(StreamDecoder.java:126)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:112)
at java.io.InputStreamReader.read(InputStreamReader.java:168)
at it.sauronsoftware.ftp4j.NVTASCIIReader.readLine(NVTASCIIReader.java:105)
at     it.sauronsoftware.ftp4j.FTPCommunicationChannel.read(FTPCommunicationChannel.java:142)
at it.sauronsoftware.ftp4j.FTPCommunicationChannel.readFTPReply(FTPCommunicationChannel.java:187)
at it.sauronsoftware.ftp4j.FTPClient.openPassiveDataTransferChannel(FTPClient.java:3538)
at it.sauronsoftware.ftp4j.FTPClient.openDataTransferChannel(FTPClient.java:3473)
at it.sauronsoftware.ftp4j.FTPClient.download(FTPClient.java:3302)
at it.sauronsoftware.ftp4j.FTPClient.download(FTPClient.java:3213)
at it.sauronsoftware.ftp4j.FTPClient.download(FTPClient.java:3078)
at Main.main(Main.java:9)

Answer 1

显然,Windows 7防火墙上有一个与在IPv6上使用FTP相关的错误,可以解释您的问题.在这里查看错误报告.

以下解决方法中的任何一个都应该足以解决它:

• 在Windows控制台中以管理员身份运行以下命令:

  netsh advfirewall set global StatefulFtp disable

• 使用以下选项运行JVM: -Djava.net.preferIPv4Stack=true