xyek4wpz3w 发表于 2016-6-8 11:25:03

Java实现ftp功能

  Java实现ftp功能源代码:
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;
  TextFieldTxtUID;
  TextFieldTxtPWD;
  TextFieldTxtHost;
  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(’*’);
  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....");
Stringcontentperline;
  try{
  a="粘贴成功!";
  String fg =newString("\\");
  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 = newFtpApplet();
           ftp.init();
           ftp.start();
           f.add(ftp);
           f.pack();
           f.setVisible(true);
        }
  }
  
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