telnetclient.java

在jCreator建立一个叫做telnet的工程 3、把本章目录下的所有源文件加入到这个工程中 4、在project菜单下选择project setting

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ipworks.*;//borland的一个网络包

public class TelnetClient extends JFrame {

  private JPanel contentPane;
  private Label label = new Label();
  private TextField textField = new TextField();
  private Button button = new Button();
  private TextArea textArea = new TextArea();
  private Telnet telnet = new Telnet();
  private boolean packFrame = false;
  
  public TelnetClient() {//构造体
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      toInit();
    }
    catch(Exception e) {
      e.printStackTrace();
      System.out.println("error1\n");
    }
  }
 
  private void toInit() throws Exception  {//初始化窗体
	  contentPane = (JPanel) this.getContentPane();//初始化面板
	  contentPane.setLayout(null);
	  this.setSize(new Dimension(500,500));
	  this.setTitle("telnet客户端");
	  textArea.setBounds(new Rectangle(20,20,450,320));
	  textArea.setEditable(true);
	  textArea.addKeyListener(new java.awt.event.KeyAdapter() {//在文本框中响应键盘事件
      	public void keyTyped(KeyEvent e) {
        	textArea_keyTyped(e);
      	}
      });
	  label.setBounds(new Rectangle(20,400,150,20));
	  label.setText("输入要连接bbs服务器:");
	  textField.setBounds(new Rectangle(180,400,210,20));
	  textField.setText("itechs.iscas.ac.cn");//默认的telnet主机地址
	  button.setBounds(new Rectangle(400,400,70,20));
	  button.setLabel("建立连接");
	  button.addActionListener(new java.awt.event.ActionListener() {
      	public void actionPerformed(ActionEvent e) {
        	button_actionPerformed(e);
      	}
      });
      contentPane.add(label,null);
      contentPane.add(button,null);
      contentPane.add(textArea,null);
      contentPane.add(textField,null);
      
      telnet.addTelnetEventListener(new ipworks.TelnetEventListener() {//telnet要响应的事件
      public void command(TelnetCommandEvent e) {
      }
      public void connected(TelnetConnectedEvent e) {
        telnet_connected(e);
      }
      public void dataIn(TelnetDataInEvent e) {
        telnet_dataIn(e);
      }
      public void disconnected(TelnetDisconnectedEvent e) {
        telnet_disconnected(e);
      }
      public void doDo(TelnetDoDoEvent e) {
        telnet_doDo(e);
      }
      public void dont(TelnetDontEvent e) {
      }
      public void error(TelnetErrorEvent e) {
      }
      public void readyToSend(TelnetReadyToSendEvent e) {
      }
      public void subOption(TelnetSubOptionEvent e) {
      }
      public void will(TelnetWillEvent e) {
        telnet_will(e);
      }
      public void wont(TelnetWontEvent e) {
      }
    });//事件列表完
  }

  public static void main(String[] args) {

    TelnetClient td = new TelnetClient();//实例化当前类
    td.setVisible(true);//设为可见
  }

  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void button_actionPerformed(ActionEvent e) {//若不联机则建立连接，否则断开连接
    try{
    	if(button.getLabel() == "建立连接"){
        telnet.setTimeout(200);//连接的最大缺省时间
        telnet.setRemoteHost(textField.getText());//设置要连接的远程主机
        telnet.setConnected(true);//处于连接状态
        textArea.append("\n正在和主机连接...请等待\n");
        } 
        else {
          telnet.disconnect();//断开连接
          telnet.setConnected(false);//处于脱机状态
          textArea.append("\n和主机的连接断开\n");
        }
    } catch (Exception ipwe) {
      System.out.println("error2\n");
      ipwe.printStackTrace();
    }
  }

  void telnet_dataIn(TelnetDataInEvent e) {//响应接收到主机数据的事件
 	
    textArea.appendText(new String(e.text));//显示接收到的数据
    textArea.setCaretPosition(textArea.getText().length());//设置当前的输入位置
  }

  void telnet_doDo(TelnetDoDoEvent e) {//响应主机发来的telnet DO OPTION命令的事件
    try {
      telnet.setWontOption(e.optionCode);//向主机发送单字节的Telnet option code响应发来的命令
    } catch (Exception ipwe) {
    	System.out.println("error3\n");
    }
  }

  void telnet_will(TelnetWillEvent e) {//响应收到Telnet WILL OPTION命令的事件
    try {
      telnet.setWillOption(e.optionCode);//向主机发送单字节的Telnet option code响应发来的命令
    } catch (Exception ipwe) {
    	System.out.println("error4\n");
    }
  }

  void textArea_keyTyped(KeyEvent e) {//响应在文字显示区域的键盘事件
    if(telnet.isConnected()){//如果建立连接，把键盘输入发给主机
    try {
      byte[] toSend = new byte[1];
      toSend[0] = (byte)e.getKeyChar();
      telnet.setDataToSend(toSend);
      e.consume();//不产生缺省得按键动作
    } catch (Exception ipwe) {
    	System.out.println("error5\n");
    }
	}
	else textArea.append("\n没有建立连接");
  }

  void telnet_connected(TelnetConnectedEvent e) {
    if (telnet.isConnected())
      button.setLabel("断开连接");
  }

  void telnet_disconnected(TelnetDisconnectedEvent e) {
    button.setLabel("建立连接");
  }
}