解决:org.apache.commons.net.MalformedServerReplyException: Could not parse response code.Server Reply: SSH-2.0-OpenSSH_5.3

当使用org.apache.commons.net.ftp.FTPClient通过协议SSH2进行SFTP连接时报如上错误，原因是它不支持这种方式的连接(使用FTPSClient的SSL也是不行的)。

示例代码：

package com.jerval.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FtpFileList {

    private static final Logger LOG = LoggerFactory.getLogger(FtpFileList.class);

    public static void main(String[] args) {
        printList();
    }

    private static void printList() {
        List<String> list = listFileNames("fca-vm-rds-prod1", "applog", "aaa", "/webapp/myrds1/lib");
        for (String fileName:list) {
            System.out.println(fileName);
        }
    }

    private static List<String> listFileNames(String host, String user, String password, String dir) {
        List<String> list = new ArrayList<String>();
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(host, 22);
            int reply = ftpClient.getReplyCode();
            if (FTPReply.isPositiveCompletion(reply)) {
                ftpClient.login(user, password);
                // ftpClient.changeWorkingDirectory(dir);
                String[] names = ftpClient.listNames(dir);
                list.addAll(Arrays.asList(names));
            }
        } catch (IOException e) {
            LOG.error("ERROR!", e);
        } finally {
            close(ftpClient);
        }

        return list;
    }

    private static void close(FTPClient ftpClient) {
        if (null != ftpClient && ftpClient.isConnected()) {
            try {
                ftpClient.logout();// 退出FTP服务器
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println("退出FTP服务器异常！");
                System.out.println(e.getMessage());
            } finally {
                try {
                    ftpClient.disconnect();// 关闭FTP服务器的连接
                    System.out.println("退出并关闭FTP服务器的连接");
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println("关闭FTP服务器的连接异常！");
                    System.out.println(e.getMessage());
                }
            }
        }
    }
}

错误信息：

3    [main] ERROR com.jerval.test.FtpFileList  - ERROR!
org.apache.commons.net.MalformedServerReplyException: Could not parse response code.
Server Reply: SSH-2.0-OpenSSH_5.3
	at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:333)
	at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:290)
	at org.apache.commons.net.ftp.FTP._connectAction_(FTP.java:396)
	at org.apache.commons.net.ftp.FTPClient._connectAction_(FTPClient.java:796)
	at org.apache.commons.net.SocketClient.connect(SocketClient.java:172)
	at org.apache.commons.net.SocketClient.connect(SocketClient.java:192)
	at com.jerval.test.FtpFileList.listFileNames(FtpFileList.java:32)
	at com.jerval.test.FtpFileList.printList(FtpFileList.java:22)
	at com.jerval.test.FtpFileList.main(FtpFileList.java:18)
org.apache.commons.net.MalformedServerReplyException: Could not parse response code.
Server Reply: Protocol mismatch.

解决方法：

使用com.jcraft.jsch.JSch提供的SSH解决方法。代码如下：

package org.jerval.test.ftp;

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Vector;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.ChannelSftp.LsEntry;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

public class FtpsFileList {
    private static final Logger LOG = LoggerFactory.getLogger(FtpsFileList.class);

    public static void main(String[] args) {
        listFileNames("fca-vm-rds-prod1.xxx.org", 22, "applog", "xxx", "/webapp/myrds1/lib");
    }

    private static List<String> listFileNames(String host, int port, String username, final String password, String dir) {
        List<String> list = new ArrayList<String>();
        ChannelSftp sftp = null;
        Channel channel = null;
        Session sshSession = null;
        try {
            JSch jsch = new JSch();
            jsch.getSession(username, host, port);
            sshSession = jsch.getSession(username, host, port);
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            LOG.debug("Session connected!");
            channel = sshSession.openChannel("sftp");
            channel.connect();
            LOG.debug("Channel connected!");
            sftp = (ChannelSftp) channel;
            Vector<?> vector = sftp.ls(dir);
            for (Object item:vector) {
                LsEntry entry = (LsEntry) item;
                System.out.println(entry.getFilename());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            closeChannel(sftp);
            closeChannel(channel);
            closeSession(sshSession);
        }
        return list;
    }

    private static void closeChannel(Channel channel) {
        if (channel != null) {
            if (channel.isConnected()) {
                channel.disconnect();
            }
        }
    }

    private static void closeSession(Session session) {
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
            }
        }
    }
}

Maven依赖：

    <dependency>
      <groupId>com.jcraft</groupId>
      <artifactId>jsch</artifactId>
      <version>0.1.49</version>
    </dependency>