java实现ftp上传，下载功能(转)

 本文来自：http://cd0281.iteye.com/blog/682103

package download;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import sun.net.TelnetInputStream;
import sun.net.TelnetOutputStream;
import sun.net.ftp.FtpClient;

public class Download {
	String localfilename;

	String remotefilename;

	FtpClient ftpClient;

	// server：服务器名字
	// user：用户名
	// password：密码
	// path：服务器上的路径
	public void connectServer(String ip, int port, String user,
			String password, String path) {

		try {
			ftpClient = new FtpClient();
			ftpClient.openServer(ip, port);
			ftpClient.login(user, password);
			System.out.println("login success!");
			if (path.length() != 0)
				ftpClient.cd(path);
			ftpClient.binary();
		} catch (IOException ex) {
			System.out.println("not login");
			System.out.println(ex);
		}
	}

	public void closeConnect() {
		try {
			ftpClient.closeServer();
			System.out.println("disconnect success");
		} catch (IOException ex) {
			System.out.println("not disconnect");
			System.out.println(ex);
		}
	}

	public void upload() {

		this.localfilename = "D://test2//test.txt";
		this.remotefilename = "test.txt";

		try {
			TelnetOutputStream os = ftpClient.put(this.remotefilename);
			java.io.File file_in = new java.io.File(this.localfilename);
			FileInputStream is = new FileInputStream(file_in);
			byte[] bytes = new byte[1024];
			int c;
			while ((c = is.read(bytes)) != -1) {
				os.write(bytes, 0, c);
			}
			System.out.println("upload success");
			is.close();
			os.close();
		} catch (IOException ex) {
			System.out.println("not upload");
			System.out.println(ex);
		}
	}

	public void download() {

		try {
			TelnetInputStream is = ftpClient.get(this.remotefilename);
			java.io.File file_in = new java.io.File(this.localfilename);
			FileOutputStream os = new FileOutputStream(file_in);
			byte[] bytes = new byte[1024];
			int c;
			while ((c = is.read(bytes)) != -1) {
				// System.out.println((char)is.read());
				// System.out.println(file_in);
				os.write(bytes, 0, c);
			}

			System.out.println("download success");
			os.close();
			is.close();
		} catch (IOException ex) {
			System.out.println("not download");
			System.out.println(ex);
		}
	}

	public void download(String remotePath, String remoteFile, String localFile) {

		try {
			if (remotePath.length() != 0)
				ftpClient.cd(remotePath);
			TelnetInputStream is = ftpClient.get(remoteFile);
			java.io.File file_in = new java.io.File(localFile);
			FileOutputStream os = new FileOutputStream(file_in);
			byte[] bytes = new byte[1024];
			int c;
			while ((c = is.read(bytes)) != -1) {
				// System.out.println((char)is.read());
				// System.out.println(file_in);
				os.write(bytes, 0, c);
			}

			System.out.println("download success");
			os.close();
			is.close();
		} catch (IOException ex) {
			System.out.println("not download");
			System.out.println(ex);
		}
	}

	public void download(String remoteFile, String localFile) {

		try {
			TelnetInputStream is = ftpClient.get(remoteFile);
			java.io.File file_in = new java.io.File(localFile);
			FileOutputStream os = new FileOutputStream(file_in);
			byte[] bytes = new byte[1024];
			int c;
			while ((c = is.read(bytes)) != -1) {
				// System.out.println((char)is.read());
				// System.out.println(file_in);
				os.write(bytes, 0, c);
			}

			System.out.println("download success");
			os.close();
			is.close();
		} catch (IOException ex) {
			System.out.println("not download");
			System.out.println(ex);
		}
	}

	public static void main(String agrs[]) {

		String filepath[] = { "/callcenter/index.jsp", "/callcenter/ip.txt",
				"/callcenter/mainframe/image/processing_bar_2.gif",
				"/callcenter/mainframe/image/logo_01.jpg" };
		String localfilepath[] = { "C:\\FTP_Test\\index.jsp",
				"C:\\FTP_Test\\ip.txt", "C:\\FTP_Test\\processing_bar_2.gif",
				"C:\\FTP_Test\\logo_01.jpg" };

		Download fu = new Download();
		fu.connectServer("172.16.1.66", 22, "web_test", "123456",
						"/callcenter");
		for (int i = 0; i < filepath.length; i++) {
			fu.download(filepath[i], localfilepath[i]);
		}

		// fu.upload();
		// fu.download();
		fu.closeConnect();

	}
}

 

另一篇：http://vipjustin.blog.163.com/blog/static/19966227200732734834722/