JAVA-JDK 1.7连接FTP服务器

FTPUtil.java

package com.ftp;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.SocketAddress;

import sun.net.ftp.FtpClient;
import sun.net.ftp.FtpProtocolException;

public class FTPUtil {
	/**
	 * 连接ftp服务器 JDK 1.7
	 * @param url
	 * @param port
	 * @param username
	 * @param password
	 * @return FtpClient
	 * @throws FtpProtocolException
	 * @throws IOException
	 */
	public static FtpClient connectFTP(String url,int port,String username,String password) {
		//创建ftp
		FtpClient ftp = null;
		try {
			//创建地址
			SocketAddress addr = new InetSocketAddress(url,port);
			//连接
			ftp = FtpClient.create();
			ftp.connect(addr);
			//登陆
			ftp.login(username,password.toCharArray());
			ftp.setBinaryType();
			System.out.println(ftp.getWelcomeMsg());
		} catch (FtpProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return ftp;
	}
	
	/**切换目录
	 * @param ftp
	 * @param path
	 */
	public static void changeDirectory(FtpClient ftp,String path) {
		try {
			ftp.changeDirectory(path);
			
			System.out.println(ftp.getWorkingDirectory());
		} catch (FtpProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	/**
	 * 关闭ftp
	 * @param ftp
	 */
	public static void disconnectFTP(FtpClient ftp){
		try {
			ftp.close();
			System.out.println("disconnect success!!");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	/**
	 * 上传文件
	 * @param localFile
	 * @param ftpFile
	 * @param ftp
	 */
	public static void upload(String localFile,String ftpFile,FtpClient ftp){
		OutputStream os = null;
		FileInputStream fis = null;
		try {
			//将ftp文件加入输出流中。输出到ftp上
			os = ftp.putFileStream(ftpFile);
			File file = new File(localFile);
			//创建一个缓冲区
			fis = new FileInputStream(file);
			byte[] bytes = new byte[1024];
			int c;
			while((c = fis.read(bytes))!=-1){
				os.write(bytes,0,c);
			}
			System.out.println("upload success!!");
		} catch (FtpProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				if(os!=null)
					os.close();
				if(fis!=null)
					fis.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		
	}
	
	/**
	 * 文件下载
	 * @param localFile
	 * @param ftpFile
	 * @param ftp
	 */
	public static void download(String localFile,String ftpFile,FtpClient ftp){
		InputStream is = null;
		FileOutputStream fos = null;
			try {
				//获取ftp上的文件
				is = ftp.getFileStream(ftpFile);
				File file = new File(localFile);
				byte[] bytes = new byte[1024];
				int i;
				fos = new FileOutputStream(file);
				while((i = is.read(bytes))!=-1){
					fos.write(bytes, 0, i);
				}
				System.out.println("download success!!");
				
			} catch (FtpProtocolException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				try {
					if(fos!=null)
						fos.close();
					if(is!=null){
						is.close();
					}
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			
	}
	
}

 Test.java

package test;

import java.net.InetAddress;
import java.net.UnknownHostException;

import sun.net.ftp.FtpClient;

import com.ftp.FTPUtil;

public class Test {
	public static void main(String[] args) {
		try {
			InetAddress addr =  InetAddress.getLocalHost();
			System.out.println(addr.getHostAddress());
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		String ip = "10.10.10.10";
		int port = 21;
		String username = "root";
		String password = "root";
		String path = "/home";
		//连接ftp
		FtpClient ftp = FTPUtil.connectFTP(ip, port, username, password);
		System.out.println(ftp.getWelcomeMsg());
		//切换目录
		FTPUtil.changeDirectory(ftp, path);
		System.out.println("-----上传----");
		FTPUtil.upload("D:\\aaa.txt", "/home/aaa.txt", ftp);
		System.out.println("-----下载----");
		FTPUtil.download("D:\\aaa.txt", "/home/aaa.txt", ftp);
	}

}