利用ftpClient实现文件上传

文章转载：https://www.cnblogs.com/yingyujyf/p/6933823.html

依赖的jar包

    
        commons-net
        commons-net
        3.3
    

FTPUtil

package ftp.ftp2;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import sun.net.TelnetOutputStream;
import sun.net.ftp.FtpProtocolException;

import java.io.*;
import java.net.SocketException;
import java.util.Properties;



public class FtpUtil {

    /**
     * 获取FTPClient对象
     *
     * @param ftpHost     FTP主机服务器
     * @param ftpPassword FTP 登录密码
     * @param ftpUserName FTP登录用户名
     * @param ftpPort     FTP端口 默认为21
     * @return
     */
    public static FTPClient getFTPClient(String ftpHost, String ftpUserName,
                                         String ftpPassword, int ftpPort) {
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient = new FTPClient();
            ftpClient.connect(ftpHost, ftpPort);// 连接FTP服务器
            ftpClient.login(ftpUserName, ftpPassword);// 登陆FTP服务器
            if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
                System.out.println("未连接到FTP，用户名或密码错误。");
                ftpClient.disconnect();
            } else {
                System.out.println("FTP连接成功。");
            }
        } catch (SocketException e) {
            e.printStackTrace();
            System.out.println("FTP的IP地址可能错误，请正确配置。");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("FTP的端口错误,请正确配置。");
        }
        return ftpClient;
    }

    /*
     * 从FTP服务器下载文件
     *
     * @param ftpHost FTP IP地址
     * @param ftpUserName FTP 用户名
     * @param ftpPassword FTP用户名密码
     * @param ftpPort FTP端口
     * @param ftpPath FTP服务器中文件所在路径 格式： ftptest/aa
     * @param localPath 下载到本地的位置 格式：H:/download
     * @param fileName 文件名称
     */
    public static void downloadFtpFile(String ftpHost, String ftpUserName,
                                       String ftpPassword, int ftpPort, String ftpPath, String localPath,
                                       String fileName) {

        FTPClient ftpClient = null;

        try {
            ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
            ftpClient.setControlEncoding("UTF-8"); // 中文支持
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.enterLocalPassiveMode();
            ftpClient.changeWorkingDirectory(ftpPath);

            File localFile = new File(localPath + File.separatorChar + fileName);
            OutputStream os = new FileOutputStream(localFile);
            ftpClient.retrieveFile(fileName, os);
            os.close();
            ftpClient.logout();

        } catch (FileNotFoundException e) {
            System.out.println("没有找到" + ftpPath + "文件");
            e.printStackTrace();
        } catch (SocketException e) {
            System.out.println("连接FTP失败.");
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("文件读取错误。");
            e.printStackTrace();
        }

    }

    /**
     * Description: 向FTP服务器上传文件
     * @param ftpHost FTP服务器hostname
     * @param ftpUserName 账号
     * @param ftpPassword 密码
     * @param ftpPort 端口
     * @param ftpPath  FTP服务器中文件所在路径 格式： ftptest/aa
     * @param fileName ftp文件名称
     * @param input 文件流
     * @return 成功返回true，否则返回false
     */
    public static boolean uploadFile(String ftpHost, String ftpUserName,
                                     String ftpPassword, int ftpPort, String ftpPath,
                                     String fileName,InputStream input) {
        boolean success = false;
        FTPClient ftpClient = null;
        try {
            int reply;
            ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
            reply = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftpClient.disconnect();
                return success;
            }
            ftpClient.setControlEncoding("UTF-8"); // 中文支持
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.enterLocalPassiveMode();
            ftpClient.changeWorkingDirectory(ftpPath);

            ftpClient.storeFile(fileName, input);

            input.close();
            ftpClient.logout();
            success = true;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                }
            }
        }
        return success;
    }

}

测试

package ftp.ftp2;

import java.io.*;

/**
 * Created by jyf on 2017/6/2.
 */
public class test {
    public static void main(String[] args) {
        String ftpHost = "172.16.114.10";
        String ftpUserName = "user";
        String ftpPassword = "a";
        int ftpPort = 21;
        String ftpPath = "test2/";
        String localPath = "F:\\11.txt";
        String fileName = "11.txt";

        //上传一个文件
        try{
            FileInputStream in=new FileInputStream(new File(localPath));
            boolean test = FtpUtil.uploadFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, fileName,in);
            System.out.println(test);
        } catch (FileNotFoundException e){
            e.printStackTrace();
            System.out.println(e);
        }

        //在FTP服务器上生成一个文件，并将一个字符串写入到该文件中
        try {
            InputStream input = new ByteArrayInputStream("test ftp jyf".getBytes("GBK"));
            boolean flag = FtpUtil.uploadFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, fileName,input);;
            System.out.println(flag);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //下载一个文件
        FtpUtil.downloadFtpFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, localPath, fileName);
    }
}