Apache Commons Net FTPClient 和 listFiles()

问题描述

谁能解释一下下面的代码有什么问题?我尝试了不同的主机，FTPClientConfigs，它可以通过 firefox/filezilla 正确访问......问题是我总是得到空文件列表，没有任何异常(files.length == 0).我使用的是随 Maven 一起安装的 commons-net-2.1.jar.

 FTPClientConfig config = new FTPClientConfig(FTPClientConfig.SYST_L8);FTPClient 客户端 = 新的 FTPClient();客户端配置(配置)；client.connect("c64.rulez.org");client.login("匿名", "匿名");client.enterRemotePassiveMode();FTPFile[] 文件 = client.listFiles();Assert.assertTrue(files.length > 0);

解决方案

找到了！

问题是您希望在连接之后但在登录之前进入被动模式.您的代码对我没有任何回报，但这对我有用:

import org.apache.commons.net.ftp.FTPClient;导入 java.io.IOException;导入 org.apache.commons.net.ftp.FTP 文件；公共类 BasicFTP {public static void main(String[] args) 抛出 IOException {FTPClient 客户端 = 新的 FTPClient();client.connect("c64.rulez.org");client.enterLocalPassiveMode();client.login("匿名", "");FTPFile[] files = client.listFiles("/pub");对于(FTPFile 文件:文件){System.out.println(file.getName());}}}

给我这个输出:

c128C64c64.hu传入加4

Can anyone explain me what's wrong with the following code? I tried different hosts, FTPClientConfigs, it's properly accessible via firefox/filezilla... The problem is I always get empty filelist without any exceptions (files.length == 0). I use commons-net-2.1.jar installed with Maven.

    FTPClientConfig config = new FTPClientConfig(FTPClientConfig.SYST_L8);

    FTPClient client = new FTPClient();
    client.configure(config);

    client.connect("c64.rulez.org");
    client.login("anonymous", "anonymous");
    client.enterRemotePassiveMode();

    FTPFile[] files = client.listFiles();
    Assert.assertTrue(files.length > 0);

解决方案

Found it!

The thing is you want to enter passive mode after you connect, but before you log in.Your code returns nothing for me, but this works for me:

import org.apache.commons.net.ftp.FTPClient;
import java.io.IOException;
import org.apache.commons.net.ftp.FTPFile;

public class BasicFTP {

    public static void main(String[] args) throws IOException {
        FTPClient client = new FTPClient();
        client.connect("c64.rulez.org");
        client.enterLocalPassiveMode();
        client.login("anonymous", "");
        FTPFile[] files = client.listFiles("/pub");
        for (FTPFile file : files) {
            System.out.println(file.getName());
        }
    }
}

Gives me this output:

c128
c64
c64.hu
incoming
plus4

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