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在这里提醒一点，在网络编程中应该多使用线程，否则会出现死锁现象。 就程序界面不刷新了。 下面的程序是在VJ++中写的，并且已经通过，能运行。大家可以自己改为纯java的。 import com.ms.wfc.app.*; import com.ms.wfc.core.*; import com.ms.wfc.ui.*; import com.ms.wfc.html.*; import sun.net.ftp.*; import sun.net.*; import java.io.* ; import java.net.*; /** * 读写在另一个socket中进行，否则会阻塞! */ public class Ftp_Study extends Form{ FtpClient aftp; DataOutputStream outputs; DataInputStream inputs; TelnetInputStream ins; TelnetOutputStream outs; int ch; String a="没有连接主机"; String b="正在连接，请等待....."; String currentPath="/";//当前的目录 String selectFilePath="";//被中的文件 String hostname=""; String user=""; String pwd=""; int port =21; public Ftp_Study() { super(); initForm(); init(); } /** * Ftp_Study overrides dispose so it can clean up the * component list. */ public void dispose(){ super.dispose(); components.dispose(); } private void edit2_textChanged(Object source, Event e){ } private void label3_click(Object source, Event e){ } private void button1_click(Object source, Event e){//connect file://this.setftpProxyHost ("61.152.210.94",3128); this.label1.setText("正在连接，请等待....."); this.hostname =this.edit1.getText(); this.user=this.edit2.getText(); this.pwd=this.edit3.getText(); if (this.connect(this.hostname,this.user,this.pwd)){ this.button1.setEnabled(false); this.button2.setEnabled(true); } } private void button2_click(Object source, Event e){//stop System.out.println ("button stop start"); this.stop(); this.button1.setEnabled(true); this.button2.setEnabled(false); this.label1.setText("与主机"+hostname+"连接已断开!"); this.edit4.setText (""); System.out.println ("button stop end"); } private void button3_click(Object source, Event e){//go System.out.println ("button enterDirectoryThread start"); String path=this.edit5 .getText (); Thread t=new enterDirectoryThread(path); t.setPriority (Thread.MIN_PRIORITY ); t.start(); System.out.println ("button enterDirectoryThread end"); } private void button4_click(Object source, Event e){//getfile System.out.println ("button getFileThread start"); Thread t=new getFileThread(); t.setPriority (Thread.MIN_PRIORITY ); t.start(); System.out.println ("button getFileThread end"); } private void button5_click(Object source, Event e){//sendfile System.out.println ("button sendFileThread start"); openFileDialog1.showDialog(); this.selectFilePath=openFileDialog1.getFileName (); System.out.println (this.selectFilePath+" has been selected!"); Thread t=new sendFileThread(); t.setPriority (Thread.MIN_PRIORITY ); file://t.start(); System.out.println ("button sendFileThread end"); } /** * NOTE: The following code is required by the Visual J++ form * designer. It can be modified using the form editor. Do not * modify it using the code editor. */ Container components = new Container(); Label label1 = new Label(); Label label2 = new Label(); Label label3 = new Label(); Label label4 = new Label(); Edit edit1 = new Edit(); Edit edit2 = new Edit(); Edit edit3 = new Edit(); Edit edit4 = new Edit(); Button button1 = new Button(); Button button2 = new Button(); Edit edit5 = new Edit(); Label label5 = new Label(); Button button3 = new Button(); Button button4 = new Button(); Button button5 = new Button(); OpenFileDialog openFileDialog1 = new OpenFileDialog(); private void initForm() { this.setText("Ftp_Study"); this.setAutoScaleBaseSize(new Point(6, 12)); this.setClientSize(new Point(455, 348)); label1.setLocation(new Point(16, 8)); label1.setSize(new Point(224, 24)); label1.setTabIndex(0); label1.setTabStop(false); label1.setText("没有连接主机"); label2.setLocation(new Point(8, 40)); label2.setSize(new Point(48, 23)); label2.setTabIndex(1); label2.setTabStop(false); label2.setText("Host:"); label3.setLocation(new Point(8, 72)); label3.setSize(new Point(48, 23)); label3.setTabIndex(2); label3.setTabStop(false); label3.setText("UseID:"); label3.addOnClick(new EventHandler(this.label3_click)); label4.setLocation(new Point(184, 72)); label4.setSize(new Point(56, 23)); label4.setTabIndex(3); label4.setTabStop(false); label4.setText("PWD:"); edit1.setLocation(new Point(64, 40)); edit1.setSize(new Point(296, 19)); edit1.setTabIndex(4); edit1.setText(""); edit2.setLocation(new Point(56, 72)); edit2.setSize(new Point(104, 19)); edit2.setTabIndex(5); edit2.setText(""); edit2.addOnTextChanged(new EventHandler(this.edit2_textChanged)); edit3.setLocation(new Point(240, 72)); edit3.setSize(new Point(104, 19)); edit3.setTabIndex(6); edit3.setText(""); edit3.setPasswordChar('*'); edit4.setLocation(new Point(8, 160)); edit4.setSize(new Point(440, 184)); edit4.setTabIndex(7); edit4.setText(""); edit4.setMultiline(true); edit4.setReadOnly(true); edit4.setScrollBars(ScrollBars.BOTH); edit4.setWordWrap(false); button1.setLocation(new Point(384, 16)); button1.setSize(new Point(64, 24)); button1.setTabIndex(8); button1.setText("连接"); button1.addOnClick(new EventHandler(this.button1_click)); button2.setEnabled(false); button2.setLocation(new Point(384, 48)); button2.setSize(new Point(64, 24)); button2.setTabIndex(9); button2.setText("断开"); button2.addOnClick(new EventHandler(this.button2_click)); edit5.setLocation(new Point(56, 104)); edit5.setSize(new Point(312, 19)); edit5.setTabIndex(10); edit5.setText(""); label5.setLocation(new Point(16, 104)); label5.setSize(new Point(40, 24)); label5.setTabIndex(11); label5.setTabStop(false); label5.setText("Path:"); button3.setLocation(new Point(384, 80)); button3.setSize(new Point(64, 23)); button3.setTabIndex(12); button3.setText("Go!"); button3.addOnClick(new EventHandler(this.button3_click)); button4.setLocation(new Point(224, 128)); button4.setSize(new Point(64, 24)); button4.setTabIndex(13); button4.setText("getFile"); button4.addOnClick(new EventHandler(this.button4_click)); button5.setLocation(new Point(304, 128)); button5.setSize(new Point(64, 24)); button5.setTabIndex(14); button5.setText("sendFile"); button5.addOnClick(new EventHandler(this.button5_click)); /* @designTimeOnly openFileDialog1.setLocation(new Point(288, 8)); */ this.setNewControls(new Control[] { button5, button4, button3, label5, edit5, button2, button1, edit4, edit3, edit2, edit1, label4, label3, label2, label1}); } public void init(){ this.edit1.setText("202.115.16.2"); this.edit2.setText ("anonymous"); this.edit3.setText ("0000"); } public boolean connect(String hostname,String uid,String pwd){ this.hostname =hostname; this.label1 .setText (this.b ); this.a ="连接主机: "+hostname+" 成功"; boolean bsuccess=true;//success try{ this.aftp =new FtpClient(this.hostname); this.aftp.login (uid,pwd); this.aftp .binary (); this.showFileContents (); } catch(FtpLoginException e){ this.a="无权限与主机: "+hostname+" 连接"; bsuccess=false; } catch(IOException e){ this.a="连接主机: "+hostname+" 失败"; bsuccess=false; } catch(SecurityException e){ this.a="无权限与主机: "+hostname+" 失败"; bsuccess=false; } finally{ this.label1 .setText (a); return bsuccess; } } public void stop(){ try{ this.aftp.closeServer (); } catch(IOException e){ } } /** * filepath --local file path */ public boolean sendFile(String filepath){ boolean result =true;//success? if(this.aftp !=null){ this.label1 .setText("正在粘贴文件,请耐心等待...."); String contentperline; a="粘贴成功!"; /* try { FtpClient ftpClient=new FtpClient(); ftpClient.openServer(this.hostname); ftpClient.login(this.user ,this.pwd); if (this.selectFilePath.length()!=0) ftpClient.cd(this.currentPath); ftpClient.binary(); String fn=new File(this.selectFilePath).getName();//filename TelnetOutputStream is=ftpClient.put(fn); File file_out=new File(fn); FileOutputStream os=new FileOutputStream(file_out); byte[] bytes=new byte[1024]; int c; while ((c=is.write(bytes))!=-1) { os.write(bytes,0,c); } is.close(); os.close(); ftpClient.closeServer(); }catch(IOException e){ a="粘贴失败!"; result=false; } */ this.label1 .setText (a); this.showFileContents (); } else{ result=false; } return result; } /** * show all the conten of the file list */ public void showFileContents(){//其中的空当都是空格! StringBuffer buf=new StringBuffer(); this.edit4.setText (""); try{ this.ins=this.aftp.list ();//return the telnetinputstream while((this.ch=this.ins.read())>0){ buf.append ((char)ch);//空当都 是空格 } this.edit4.setText(buf.toString()); this.ins.close (); System.out.println ("showFileContents ins closed"); } catch(IOException e){ } } /** * 进入目录中 */ public void enterDiectory(String path){ try{ if (path.length()>0){ this.aftp.cd(path); file://enter in the directory this.showFileContents(); if(path.equals("..") ){ int pos=0; pos=this.currentPath.lastIndexOf("/"); this.currentPath=this.currentPath.substring(0,pos); pos=this.currentPath.lastIndexOf("/"); this.currentPath=this.currentPath.substring (0,pos+1); } else this.currentPath=this.currentPath+path+"/"; this.a="当前目录: "+this.currentPath; System.out.println ("this.currentPath: "+this.currentPath); } } catch(IOException e){ this.a="无法进入目录: /"+path; } finally{ this.label1 .setText (this.a ); } } public void getFile(String filename){ try { FtpClient ftpClient=new FtpClient(); ftpClient.openServer(this.hostname); ftpClient.login(this.user, this.pwd); if (this.currentPath.length()!=0) ftpClient.cd(this.currentPath); ftpClient.binary(); TelnetInputStream is=ftpClient.get(filename); File file_out=new File(filename); FileOutputStream os=new FileOutputStream(file_out); byte[] bytes=new byte[1024]; int c; while ((c=is.read(bytes))!=-1) { os.write(bytes,0,c); } is.close(); os.close(); ftpClient.closeServer(); } catch (IOException ex) {;} } public void getFile(){ String filename=this.edit5.getText(); this.getFile(filename); } /* public void setftpProxyHost(String ProxyHost,int ProxyPort){ this.aftp.ftpProxyHost=ProxyHost; this.aftp.ftpProxyPort=ProxyPort; this.aftp.useFtpProxy=true; }*/ /** * The main entry point for the application. * * @param args Array of parameters passed to the application * via the command line. */ public static void main(String args[]) { Application.run(new Ftp_Study()); } class getFileThread extends Thread { public void run(){ getFile(); System.out.println ("getFile is completed"); } } class sendFileThread extends Thread { public void run(){ sendFile(selectFilePath); System.out.println ("sendFile is completed. "); } } class enterDirectoryThread extends Thread { String szPath; public enterDirectoryThread(String path){ this.szPath =path; } public void run(){ enterDiectory(this.szPath); System.out.println ("enterDiectory is completed"); } } class connectThread extends Thread { String hostname=""; String uid=""; String pwd=""; public connectThread(String hostname1,String uid1,String pwd1){ this.hostname=hostname1; this.uid=uid1; this.pwd =pwd1; } public void run(){ connect(this.hostname,this.uid,this.pwd); System.out.println ("connect ... "); } } } 本人水平有限，望多指教。
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