javaftp服务器代码（java ftp服务器）

今天给各位分享javaftp服务器代码的知识，其中也会对java ftp服务器进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

• 1、求用java写一个ftp服务器客户端程序。
• 2、java FTP下载文件在代码中如何实现知道下载完成?
• 3、如何用Java实现FTP服务器

求用java写一个ftp服务器客户端程序。

import java.io.*;

import java.net.*;public class ftpServer extends Thread{ public static void main(String args[]){

String initDir;

initDir = "D:/Ftp";

ServerSocket server;

Socket socket;

String s;

String user;

String password;

user = "root";

password = "123456";

try{

System.out.println("MYFTP服务器启动....");

System.out.println("正在等待连接....");

//监听21号端口

server = new ServerSocket(21);

socket = server.accept();

System.out.println("连接成功");

System.out.println("**********************************");

System.out.println("");

InputStream in =socket.getInputStream();

OutputStream out = socket.getOutputStream();

DataInputStream din = new DataInputStream(in);

DataOutputStream dout=new DataOutputStream(out);

System.out.println("请等待验证客户信息....");

while(true){

s = din.readUTF();

if(s.trim().equals("LOGIN "+user)){

s = "请输入密码:";

dout.writeUTF(s);

s = din.readUTF();

if(s.trim().equals(password)){

s = "连接成功。";

dout.writeUTF(s);

break;

}

else{s ="密码错误，请重新输入用户名：";br dout.writeUTF(s);br br }

}

else{

s = "您输入的命令不正确或此用户不存在，请重新输入：";

dout.writeUTF(s);

}

}

System.out.println("验证客户信息完毕...."); while(true){

System.out.println("");

System.out.println("");

s = din.readUTF();

if(s.trim().equals("DIR")){

String output = "";

File file = new File(initDir);

String[] dirStructure = new String[10];

dirStructure= file.list();

for(int i=0;idirStructure.length;i++){

output +=dirStructure[i]+"\n";

}

s=output;

dout.writeUTF(s);

}

else if(s.startsWith("GET")){

s = s.substring(3);

s = s.trim();

File file = new File(initDir);

String[] dirStructure = new String[10];

dirStructure= file.list();

String e= s;

int i=0;

s ="不存在";

while(true){

if(e.equals(dirStructure[i])){

s="存在";

dout.writeUTF(s);

RandomAccessFile outFile = new RandomAccessFile(initDir+"/"+e,"r");

byte byteBuffer[]= new byte[1024];

int amount;

while((amount = outFile.read(byteBuffer)) != -1){

dout.write(byteBuffer, 0, amount);break;

}break;

}

else if(idirStructure.length-1){

i++;

}

else{

dout.writeUTF(s);

break;

}

}

}

else if(s.startsWith("PUT")){

s = s.substring(3);

s = s.trim();

RandomAccessFile inFile = new RandomAccessFile(initDir+"/"+s,"rw");

byte byteBuffer[] = new byte[1024];

int amount;

while((amount =din.read(byteBuffer) )!= -1){

inFile.write(byteBuffer, 0, amount);break;

}

}

else if(s.trim().equals("BYE"))break;

else{

s = "您输入的命令不正确或此用户不存在，请重新输入：";

dout.writeUTF(s);

}

}

din.close();

dout.close();

in.close();

out.close();

socket.close();

}

catch(Exception e){

System.out.println("MYFTP关闭!"+e);

}

}}

java FTP下载文件在代码中如何实现知道下载完成?

public static void downloadFileFtp(KmConfig kmConfig,String fileName, String clientFileName, OutputStream outputStream){

try {

String ftpHost = kmConfig.getFtpHost();

int port = kmConfig.getFtpPort();

String userName = kmConfig.getFtpUser();

String passWord = kmConfig.getFtpPassword();

String path = kmConfig.getFtpPath();

FtpClient ftpClient = new FtpClient(ftpHost, port);// ftpHost为FTP服务器的IP地址，port为FTP服务器的登陆端口,ftpHost为String型,port为int型。

ftpClient.login(userName, passWord);// userName、passWord分别为FTP服务器的登陆用户名和密码

ftpClient.binary();

ftpClient.cd(path);// path为FTP服务器上保存上传文件的路径。

try {

TelnetInputStream in = ftpClient.get(fileName);

byte[] bytes = new byte[1024];

int cnt=0;

while ((cnt=in.read(bytes,0,bytes.length)) != -1) {

outputStream.write(bytes, 0, cnt);

}

//##############################################

//这里文件就已经下载完了，自己理解一下

//#############################################

outputStream.close();

in.close();

} catch (Exception e) {

ftpClient.closeServer();

e.printStackTrace();

}

ftpClient.closeServer();

} catch (Exception e) {

System.out.println("下载文件失败！请检查系统FTP设置,并确认FTP服务启动");

}

}

如何用Java实现FTP服务器

FTP(File Transfer Protocol 文件传输协议)是Internet 上用来传送文件的协议。在Internet上通过FTP 服务器可以进行文件的上传(Upload)或下载(Download)。FTP是实时联机服务，在使用它之前必须是具有该服务的一个用户(用户名和口令)，工作时客户端必须先登录到作为服务器一方的计算机上，用户登录后可以进行文件搜索和文件传送等有关操作，如改变当前工作目录、列文件目录、设置传输参数及传送文件等。使用FTP可以传送所有类型的文件，如文本文件、二进制可执行文件、图象文件、声音文件和数据压缩文件等。

FTP 命令

FTP 的主要操作都是基于各种命令基础之上的。常用的命令有：

设置传输模式，它包括ASCⅡ(文本) 和BINARY 二进制模式;

目录操作，改变或显示远程计算机的当前目录(cd、dir/ls 命令);

连接操作，open命令用于建立同远程计算机的连接；close命令用于关闭连接;

发送操作，put命令用于传送文件到远程计算机；mput 命令用于传送多个文件到远程计算机;

获取操作，get命令用于接收一个文件；mget命令用于接收多个文件。

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import java.net.Socket;import org.apache.log4j.Logger;/** * 角色——服务器A * @author Leon * */public class ServerA{ public static void main(String[] args){ final String F_DIR = "c:/test";//根路径 final int PORT = 22;//监听端口号 Logger.getRootLogger(); Logger logger = Logger.getLogger("com"); try{ ServerSocket s = new ServerSocket(PORT); logger.info("Connecting to server A..."); logger.info("Connected Successful! Local Port:"+s.getLocalPort()+". Default Directory:'"+F_DIR+"'."); while( true ){ //接受客户端请求 Socket client = s.accept(); //创建服务线程 new ClientThread(client, F_DIR).start(); } } catch(Exception e) { logger.error(e.getMessage()); for(StackTraceElement ste : e.getStackTrace()){ logger.error(ste.toString()); } } }}import java.io.BufferedReader; import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.PrintWriter;import java.io.RandomAccessFile;import java.net.ConnectException;import java.net.InetAddress;import java.net.ServerSocket;import java.net.Socket;import java.net.UnknownHostException;import java.nio.charset.Charset;import java.util.Random;import org.apache.log4j.Logger;/** * 客户端子线程类 * @author Leon * */public class ClientThread extends Thread { private Socket socketClient;//客户端socket private Logger logger;//日志对象 private String dir;//绝对路径 private String pdir = "/";//相对路径 private final static Random generator = new Random();//随机数 public ClientThread(Socket client, String F_DIR){ this.socketClient = client; this.dir = F_DIR; } @Override public void run() { Logger.getRootLogger(); logger = Logger.getLogger("com"); InputStream is = null; OutputStream os = null; try { is = socketClient.getInputStream(); os = socketClient.getOutputStream(); } catch (IOException e) { logger.error(e.getMessage()); for(StackTraceElement ste : e.getStackTrace()){ logger.error(ste.toString()); } } BufferedReader br = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); PrintWriter pw = new PrintWriter(os); String clientIp = socketClient.getInetAddress().toString().substring(1);//记录客户端IP String username = "not logged in";//用户名 String password = "";//口令 String command = "";//命令 boolean loginStuts = false;//登录状态 final String LOGIN_WARNING = "530 Please log in with USER and PASS first."; String str = "";//命令内容字符串 int port_high = 0; int port_low = 0; String retr_ip = "";//接收文件的IP地址 Socket tempsocket = null; //打印欢迎信息 pw.println("220-FTP Server A version 1.0 written by Leon Guo"); pw.flush(); logger.info("("+username+") ("+clientIp+") Connected, sending welcome message..."); logger.info("("+username+") ("+clientIp+") 220-FTP Server A version 1.0 written by Leon Guo"); boolean b = true; while ( b ){ try { //获取用户输入的命令 command = br.readLine(); if(null == command) break; } catch (IOException e) { pw.println("331 Failed to get command"); pw.flush(); logger.info("("+username+") ("+clientIp+") 331 Failed to get command"); logger.error(e.getMessage()); for(StackTraceElement ste : e.getStackTrace()){ logger.error(ste.toString()); } b = false; } /* * 访问控制命令 */ // USER命令 if(command.toUpperCase().startsWith("USER")){ logger.info("(not logged in) ("+clientIp+") "+command); username = command.substring(4).trim(); if("".equals(username)){ pw.println("501 Syntax error"); pw.flush(); logger.info("(not logged in) ("+clientIp+") 501 Syntax error"); username = "not logged in"; } else{ pw.println("331 Password required for " + username); pw.flush(); logger.info("(not logged in) ("+clientIp+") 331 Password required for " + username); } loginStuts = false; } //end USER // PASS命令 else if(command.toUpperCase().startsWith("PASS")){ logger.info("(not logged in) ("+clientIp+") "+command); password = command.substring(4).trim(); if(username.equals("root") password.equals("root")){ pw.println("230 Logged on"); pw.flush(); logger.info("("+username+") ("+clientIp+") 230 Logged on");// logger.info("客户端 "+clientIp+" 通过 "+username+"用户登录"); loginStuts = true; } else{ pw.println("530 Login or password incorrect!"); pw.flush(); logger.info("(not logged in) ("+clientIp+") 530 Login or password incorrect!"); username = "not logged in"; } } //end PASS // PWD命令 else if(command.toUpperCase().startsWith("PWD")){ logger.info("("+username+") ("+clientIp+") "+command); if(loginStuts){// logger.info("用户"+clientIp+"："+username+"执行PWD命令"); pw.println("257 /""+pdir+"/" is current directory"); pw.flush(); logger.info("("+username+") ("+clientIp+") 257 /""+pdir+"/" is current directory"); } else{ pw.println(LOGIN_WARNING); pw.flush(); logger.info("("+username+") ("+clientIp+") "+LOGIN_WARNING); } } //end PWD // CWD命令 else if(command.toUpperCase().startsWith("CWD")){ logger.info("("+username+") ("+clientIp+") "+command); if(loginStuts){ str = command.substring(3).trim(); if("".equals(str)){ pw.println("250 Broken client detected, missing argument to CWD. /""+pdir+"/" is current directory."); pw.flush(); logger.info("("+username+") ("+clientIp+") 250 Broken client detected, missing argument to CWD. /""+pdir+"/" is current directory."); } else{ //判断目录是否存在 String tmpDir = dir + "/" + str; File file = new File(tmpDir); if(file.exists()){//目录存在 dir = dir + "/" + str; if("/".equals(pdir)){ pdir = pdir + str; } else{ pdir = pdir + "/" + str; }// logger.info("用户"+clientIp+"："+username+"执行CWD命令"); pw.println("250 CWD successful. /""+pdir+"/" is current directory"); pw.flush(); logger.info("("+username+") ("+clientIp+") 250 CWD successful. /""+pdir+"/" is current directory"); } else{//目录不存在 pw.println("550 CWD failed. /""+pdir+"/": directory not found."); pw.flush(); logger.info("("+username+") ("+clientIp+") 550 CWD failed. /""+pdir+"/": directory not found.");

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