java实现FTP功能代码,Java代码库,德仔网

代码语言
代码分类
【Java】 java实现FTP功能
作者:Dezai.CN / 发布于2013/5/21/ 740

	import sun.net.ftp.*;
	import sun.net.*;
	import java.awt.*;
	import java.awt.event.*;
	import java.applet.*;
	import java.io.*;

	public class FtpApplet extends Applet
	{
	FtpClient aftp;
	DataOutputStream outputs ;
	TelnetInputStream ins;
	TelnetOutputStream outs;
	TextArea lsArea;
	Label LblPrompt;
	Button BtnConn;
	Button BtnClose;
	TextField TxtUID;
	TextField TxtPWD;
	TextField TxtHost;
	int ch;
	public String a="没有连接主机";
	 String hostname="";
	public void init () {
	setBackground(Color.white);
	setLayout(new GridBagLayout());
	GridBagConstraints GBC = new GridBagConstraints();
	LblPrompt = new Label("没有连接主机");
	LblPrompt.setAlignment(Label.LEFT);

	BtnConn = new Button("连接");
	BtnClose = new Button("断开");
	BtnClose.enable(false);
	TxtUID = new TextField("",15);
	TxtPWD = new TextField("",15);
	TxtPWD.setEchoCharacter(&rsquo;*&rsquo;);
	TxtHost = new TextField("",20);
	Label LblUID = new Label("User ID:");
	Label LblPWD = new Label("PWD:");
	Label LblHost = new Label("Host:");

	lsArea = new TextArea(30,80);
	lsArea.setEditable(false);

	GBC.gridwidth= GridBagConstraints.REMAINDER;
	GBC.fill = GridBagConstraints.HORIZONTAL;
	((GridBagLayout)getLayout()).setConstraints(LblPrompt,GBC);
	add(LblPrompt);

	GBC.gridwidth=1;
	((GridBagLayout)getLayout()).setConstraints(LblHost,GBC);
	add(LblHost);
	GBC.gridwidth=GridBagConstraints.REMAINDER;
	((GridBagLayout)getLayout()).setConstraints(TxtHost,GBC);
	add(TxtHost);

	GBC.gridwidth=1;
	((GridBagLayout)getLayout()).setConstraints(LblUID,GBC);
	add(LblUID);
	GBC.gridwidth=1;
	((GridBagLayout)getLayout()).setConstraints(TxtUID,GBC);
	add(TxtUID);

	GBC.gridwidth=1;
	((GridBagLayout)getLayout()).setConstraints(LblPWD,GBC);
	add(LblPWD);
	GBC.gridwidth=1;
	((GridBagLayout)getLayout()).setConstraints(TxtPWD,GBC);
	add(TxtPWD);

	GBC.gridwidth=1;
	GBC.weightx=2;
	((GridBagLayout)getLayout()).setConstraints(BtnConn,GBC);
	add(BtnConn);
	GBC.gridwidth=GridBagConstraints.REMAINDER;

	((GridBagLayout)getLayout()).setConstraints(BtnClose,GBC);
	add(BtnClose);

	GBC.gridwidth=GridBagConstraints.REMAINDER;
	GBC.fill = GridBagConstraints.HORIZONTAL;
	((GridBagLayout)getLayout()).setConstraints(lsArea,GBC);
	add(lsArea);
	 }

	public boolean connect(String hostname, String uid,String pwd)
	{
	 this.hostname = hostname;
	LblPrompt.setText("正在连接，请等待.....");
	try{
	 aftp =new FtpClient(hostname);
	 aftp.login(uid,pwd);
	 aftp.binary();
	 showFileContents();
	}
	catch(FtpLoginException e){
	a="无权限与主机:"+hostname+"连接!";
	LblPrompt.setText(a);
	return false;
	}
	catch (IOException e){
	a="连接主机:"+hostname+"失败!";
	LblPrompt.setText(a);
	return false;
	}
	catch(SecurityException e)
	{
	a="无权限与主机:"+hostname+"连接!";
	LblPrompt.setText(a);
	return false;
	}
	LblPrompt.setText("连接主机:"+hostname+"成功!");
	return true;
	}

	public void stop()
	{
	try
	{
	aftp.closeServer();
	}
	catch(IOException e)
	{
	}
	}

	public void paint(Graphics g){
	}

	public boolean action(Event evt,Object obj)
	{
	if (evt.target == BtnConn)
	{
	LblPrompt.setText("正在连接，请等待.....");
	if (connect(TxtHost.getText(),TxtUID.getText(),TxtPWD.getText()))
	{
	BtnConn.setEnabled(false);
	BtnClose.setEnabled(true);
	}
	return true;
	}
	if (evt.target == BtnClose)
	{
	stop();
	BtnConn.enable(true);
	BtnClose.enable(false);
	LblPrompt.setText("与主机"+hostname+"连接已断开!");
	return true;
	}
	return super.action(evt,obj);
	}
	public boolean sendFile(String filepathname){
	boolean result=true;
	if (aftp != null)
	{
	LblPrompt.setText("正在粘贴文件,请耐心等待....");

	String contentperline;
	try{
	a="粘贴成功!";
	String fg =new String("//");
	int index = filepathname.lastIndexOf(fg);
	String filename = filepathname.substring(index+1);
	File localFile ;
	localFile = new File(filepathname) ;
	RandomAccessFile sendFile = new RandomAccessFile(filepathname,"r");
	//
	sendFile.seek(0);
	outs = aftp.put(filename);
	outputs = new DataOutputStream(outs);
	while (sendFile.getFilePointer() < sendFile.length() )
	{
	 ch = sendFile.read();
	 outputs.write(ch);
	}
	outs.close();
	sendFile.close();
	}
	catch(IOException e){
	 a = "粘贴失败!";
	 result = false ;

	}
	LblPrompt.setText(a);
	showFileContents();
	}
	else{
	result = false;
	}
	return result;
	}

	public void showFileContents()
	{
	StringBuffer buf = new StringBuffer();
	lsArea.setText("");
	try
	{
	ins= aftp.list();
	while ((ch=ins.read())>=0){
	 buf.append((char)ch);
	}
	 lsArea.appendText(buf.toString());
	ins.close();
	 }
	catch(IOException e)
	{
	}
	}
	 public static void main(String args[]){
	 Frame f = new Frame("FTP Client");
	 f.addWindowListener(new WindowAdapter(){
	 public void windowClosing(WindowEvent e){
	 System.exit(0);
	 }

	 });
	 FtpApplet ftp = new FtpApplet();
	 ftp.init();
	 ftp.start();
	 f.add(ftp);
	 f.pack();
	 f.setVisible(true);
	 }
	}
试试其它关键字
　FTP　
同语言下
可能有用的
Dezai.CN贡献的其它代码(4037)