ftp 两台服务器传输文件 apache

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.SocketException;
import java.text.SimpleDateFormat;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

 public void ftpServer2Server() throws SocketException, IOException {

        FTPClient ftp1 = new FTPClient();
        FTPClient ftp2 = new FTPClient();
        //连接ftp
        ftp1.connect("xxx.xxx.xxx.xxx", 21); //可以不需要port
        ftp1.login("user", "123456");
        //ftp2照样如此……
        String initDir = "mydata";
        ftp2.connect("xxx.com", 21); //可以不需要port
        ftp2.login("user2", "pswd2", initDir);
        ftp2.changeWorkingDirectory(initDir);

        //list files
        listFiles(ftp1);

        //list dir
        listFiles(ftp2);

        OutputStream os = ftp2.storeFileStream("testFromFtp.mp3");//这句话就是获取ftp2的流

        if (os == null) {
            System.out.println(" italkdd.upload.akamai.com not open: " + ftp2.getReplyString());
            return;
        }
        ftp1.retrieveFile("test.mp3", os); //这句话是把文件从ftp1复制到ftp2中，通过流is
        os.close();

        System.out.println(" upload suc: " + ftp2.getReplyString());

        // Must call completePendingCommand() to finish command.
        if (!ftp2.completePendingCommand()) {//完成数据传送,进入文件管理,这条语句特别关键，不然你不能进行文件管理操作（获取当前目录）特别重要

            System.err.println("File transfer failed.");
        }else{
            System.err.println("File transfer suc.");
        }

/*
         InputStream input;
         OutputStream output;
         input  = new FileInputStream("foobaz.txt");
         output = ftp.storeFileStream("foobar.txt")
         if(!FTPReply.isPositiveIntermediate(ftp.getReplyCode())) {
             input.close();
             output.close();
             ftp.logout();
             ftp.disconnect();
             System.err.println("File transfer failed.");
             System.exit(1);
         }
         Util.copyStream(input, output);
         input.close();
         output.close();
         // Must call completePendingCommand() to finish command.
         if(!ftp.completePendingCommand()) {
             ftp.logout();
             ftp.disconnect();
             System.err.println("File transfer failed.");
             System.exit(1);
         }

    */     

        listFiles(ftp2);

        ftp1.logout();
        ftp1.disconnect();

        ftp2.logout();
        ftp2.disconnect();

    }

    public void listFiles(FTPClient ftp) {
        //list dir
        try {
            FTPFile[] listfiles = ftp.listFiles();
            for (int ii = 0; ii < listfiles.length; ii++) {
                System.out.println(" == " + listfiles[ii].getName());
            }
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
    }

用mvn，pom.xml中加入对apache commons的依赖：

<!-- https://mvnrepository.com/artifact/commons-net/commons-net -->
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.5</version>
</dependency>