使用FtpClient连接FTP服务器

package com.hejx.ftp;import java.io.DataInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.FileInputStream;import java.util.ArrayList;import java.util.List;import sun.net.*;import sun.net.ftp.FtpClient;public class FtpUtil {FtpClient ftpClient;/** * connectServer 连接ftp服务器 * * @throws java.io.IOException * @param path * 文件夹，空代表根目录 * @param password * 密码 * @param user * 登陆用户 * @param server * 服务器地址 */public void connectServer(String server, String user, String password,String path) throws IOException {// server：FTP服务器的IP地址；user:登录FTP服务器的用户名// password：登录FTP服务器的用户名的口令；path：FTP服务器上的路径ftpClient = new FtpClient();ftpClient.openServer(server);ftpClient.login(user, password);// path是ftp服务下主目录的子目录if (path.length() != 0)ftpClient.cd(path);// 用2进制上传、下载ftpClient.binary();}/** * upload 上传文件 * * @throws java.lang.Exception * @return -1 文件不存在 -2 文件内容为空 >0 成功上传，返回文件的大小 * @param newname * 上传后的新文件名 * @param filename * 上传的文件 */public long upload(String filename, String newname) throws Exception {long result = 0;TelnetOutputStream os = null;FileInputStream is = null;try {java.io.File file_in = new java.io.File(filename);if (!file_in.exists())return -1;if (file_in.length() == 0)return -2;os = ftpClient.put(newname);result = file_in.length();is = new FileInputStream(file_in);byte[] bytes = new byte[1024];int c;while ((c = is.read(bytes)) != -1) {os.write(bytes, 0, c);}} finally {if (is != null) {is.close();}if (os != null) {os.close();}}return result;}/** * upload * * @throws java.lang.Exception * @return * @param filename */public long upload(String filename) throws Exception {String newname = "";if (filename.indexOf("/") > -1) {newname = filename.substring(filename.lastIndexOf("/") + 1);} else {newname = filename;}return upload(filename, newname);}/** * download 从ftp下载文件到本地 * * @throws java.lang.Exception * @return * @param newfilename * 本地生成的文件名 * @param filename * 服务器上的文件名 */public long download(String filename, String newfilename) throws Exception {long result = 0;TelnetInputStream is = null;FileOutputStream os = null;try {is = ftpClient.get(filename);java.io.File outfile = new java.io.File(newfilename);os = new FileOutputStream(outfile);byte[] bytes = new byte[1024];int c;while ((c = is.read(bytes)) != -1) {os.write(bytes, 0, c);result = result + c;}} catch (IOException e) {e.printStackTrace();} finally {if (is != null) {is.close();}if (os != null) {os.close();}}return result;}/** * 取得某个目录下的所有文件列表 * */public List getFileList(String path) {List list = new ArrayList();try {DataInputStream dis = new DataInputStream(ftpClient.nameList(path));String filename = "";while ((filename = dis.readLine()) != null) {list.add(filename);}} catch (Exception e) {e.printStackTrace();}return list;}/** * closeServer 断开与ftp服务器的链接 * * @throws java.io.IOException */public void closeServer() throws IOException {try {if (ftpClient != null) {ftpClient.closeServer();}} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) throws Exception {FtpUtil ftp = new FtpUtil();try {// 连接ftp服务器ftp.connectServer("127.0.0.1", "guest", "guest", "");/** 上传文件到 info2 文件夹下 *///System.out.println("filesize:" + ftp.upload("f:/download/Install.exe") + "字节");/** 取得info2文件夹下的所有文件列表,并下载到 E盘下 */List list = ftp.getFileList(".");for (int i = 0; i < list.size(); i++) {String filename = (String) list.get(i);System.out.println(filename);ftp.download(filename, "D:/" + filename);}} catch (Exception e) {// /} finally {ftp.closeServer();}}}