求telnet客户端源程序学习 呵呵。我也要[email protected] 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 没有注释的要不要?//FtpApplet.javaimport 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('*'); 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); } } 很简单的,一个网络SOCKET连接类,指定主机和端口一连,一个读写头,读入SOCKET传入的InputStream 弱弱地问一下:怎样才能使我的画面出现放大效果呢? 新手救急 80分 学习java 一个GUI问题? 我应该双击哪个图标来运行我写的程序呢? 用java mail1.2发送邮件在TOMCAT4.0下抛出IO异常——代号500?求解!!! 谁有JDK1.3或者1.4的API文档要中文的! scip问题-----又送30分! 求救,sql语句的中文问题 为什么用drawString输出中文都是方框? 还是我还是java打印问题 文本图片打印如何分页(对不起!我只有10分了) [求助]applet 怎么看不到
//FtpApplet.java
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('*');
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);
}
}