Java 不用三方包, 并且使用socket, 访问ftp, 并且将文件上传

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.DataInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.Socket;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.StringTokenizer;import java.util.logging.Level;import java.util.logging.Logger;/* * To change this template, choose Tools | Templates * and open the template in the editor. *//** * * @author guofan */public class FTPRead { //定义基础变量 Socket socket = null; BufferedReader reader = null; BufferedWriter writer = null; public synchronized void connect(String host) throws IOException { connect(host, 21); } public synchronized void connect(String host, int port) throws IOException { connect(host, port, "anonymous", "anonymous"); } public synchronized void connect(String host, int port, String user, String pass) { try { socket = new Socket(host, port); reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); String line = reader.readLine(); System.out.println("step1 ----- " + line); //input user sendCommand("USER " + user); line = reader.readLine(); System.out.println("step2 -----" + line); //input pwd sendCommand("PASS " + pass); line = reader.readLine(); System.out.println("step3 -----" + line); } catch (UnknownHostException ex) { System.out.println("Couldn't find the Ftp Server"); } catch (IOException ex) { System.out.println("IOException"); } } public synchronized void disconnect() throws IOException { try { sendCommand("QUIT"); System.out.println("last step ----- " + reader.readLine()); } finally { socket = null; } } public synchronized void listFiles(String serverPath) throws IOException { writer.write("cwd " + serverPath + "/r/n"); //若要指定某一位置就修改 caches writer.flush(); System.out.println(reader.readLine()); sendCommand("PASV"); String response = reader.readLine(); String ip = null; int port1 = -1; int opening = response.indexOf('('); int closing = response.indexOf(')', opening + 1); if (closing > 0) { String dataLink = response.substring(opening + 1, closing); StringTokenizer tokenizer = new StringTokenizer(dataLink, ","); try { ip = tokenizer.nextToken() + "." + tokenizer.nextToken() + "." + tokenizer.nextToken() + "." + tokenizer.nextToken(); port1 = Integer.parseInt(tokenizer.nextToken()) * 256 + Integer.parseInt(tokenizer.nextToken()); } catch (Exception e) { throw new IOException("SimpleFTP received bad data link information: " + response); } } System.out.println(ip + " " + port1); writer.write("LIST " + "/r/n"); writer.flush(); Socket dataSocket = new Socket(ip, port1); reader.readLine(); DataInputStream dis = new DataInputStream(dataSocket.getInputStream()); String s = ""; while ((s = dis.readLine()) != null) { String l = new String(s.getBytes("ISO-8859-1"), "utf-8"); System.out.println(l); } dis.close(); dataSocket.close(); reader.readLine(); } public synchronized boolean upload(String lfilepath, String serverPath) throws IOException { File file = new File(lfilepath); if (file.isDirectory()) { throw new IOException("SimpleFTP cannot upload a directory."); } String filename = file.getName(); BufferedInputStream input = new BufferedInputStream(new FileInputStream(file)); writer.write("cwd " + serverPath + "/r/n"); //若要指定某一位置就修改 caches writer.flush(); System.out.println(reader.readLine()); sendCommand("PASV"); String response = reader.readLine(); if (!response.startsWith("227 ")) { throw new IOException("SimpleFTP could not request passive mode: " + response); } String ip = null; int port = -1; int opening = response.indexOf('('); int closing = response.indexOf(')', opening + 1); if (closing > 0) { String dataLink = response.substring(opening + 1, closing); StringTokenizer tokenizer = new StringTokenizer(dataLink, ","); try { ip = tokenizer.nextToken() + "." + tokenizer.nextToken() + "." + tokenizer.nextToken() + "." + tokenizer.nextToken(); port = Integer.parseInt(tokenizer.nextToken()) * 256 + Integer.parseInt(tokenizer.nextToken()); } catch (Exception e) { throw new IOException("SimpleFTP received bad data link information: " + response); } } System.out.println(ip + " " + port); sendCommand("STOR " + filename); Socket dataSocket = new Socket(ip, port); response = reader.readLine(); BufferedOutputStream output = new BufferedOutputStream(dataSocket.getOutputStream()); byte[] buffer = new byte[4096]; int bytesRead = 0; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } output.flush(); output.close(); input.close(); response = reader.readLine(); return response.startsWith("226 "); } private void sendCommand(String com) throws IOException { if (socket == null) { throw new IOException("SimpleFTP is not connected."); } try { writer.write(com + "/r/n"); writer.flush(); } catch (IOException e) { socket = null; throw e; } } public static void main(String args[]) throws IOException { String host = "127.0.0.1"; int port = 21; String uname = "test"; String pwd = "123456"; FTPRead fr = new FTPRead(); fr.connect(host, port, uname, pwd); fr.listFiles("caches//LinkIcons"); //fr.upload("D://1400x1050-asia-emea.jpg"); fr.disconnect(); }}