applet1.java

来自「java网络高级编程的配套源码,java网络高级编程为清华出版社出版.」· Java 代码 · 共 162 行

/*源程序清单12-6*/

package client;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import borland.jbcl.layout.*;
import borland.jbcl.control.*;
import java.net.*;

public class Applet1 extends Applet
{
  boolean isStandalone = false;
  Button button1 = new Button();
  Label label1 = new Label();
  TextField textField1 = new TextField();
  GroupBox groupBox1 = new GroupBox();
  TextArea textArea1 = new TextArea();
  PaneLayout paneLayout1 = new PaneLayout();
  PaneLayout paneLayout2 = new PaneLayout();
  boolean login=false;
  SimpleClient simpleClient=null;
  static String userName="";
  String hostname="www.mc.zju.edu.cn";
  
  //Construct the applet
  public Applet1()
  {
  }

  //Initialize the applet
  public void init()
  {
    try
    {
      URL url=this.getCodeBase();
      String te=url.toString();
      String temp=url.getHost();
      if(!(temp.equals("")))
        hostname=temp;//得到服务器的id地址
      else
        hostname="www.mc.zju.edu.cn";
      jbInit();
      }
      catch (Exception e)
      {
        e.printStackTrace();
      }
  }

  //Component initialization
  private void jbInit() throws Exception
  {
    this.setSize(new Dimension(444, 263));
    button1.setLabel("登录");
    label1.setAlignment(2);
    label1.setText("用户名：");
    textField1.addActionListener(new Applet1_textField1_actionAdapter(this));
    groupBox1.setLayout(paneLayout1);
    groupBox1.setLabel("信息");
    button1.addActionListener(new Applet1_button1_actionAdapter(this));
    this.setLayout(paneLayout2);
    this.add(groupBox1, new PaneConstraints("groupBox1", "groupBox1", PaneConstraints.ROOT, 0.5f));
    groupBox1.add(textArea1, new PaneConstraints("textArea1", "textArea1", PaneConstraints.ROOT, 1.0f));
    this.add(label1, new PaneConstraints("label1", "groupBox1", PaneConstraints.BOTTOM, 0.09505701f));
    this.add(textField1, new PaneConstraints("textField1", "label1", PaneConstraints.RIGHT, 0.83229816f));
    this.add(button1, new PaneConstraints("button1", "textField1", PaneConstraints.RIGHT, 0.30223882f));
  }

  //Get Applet information
  public String getAppletInfo()
  {
    return "Applet Information";
  }

  //Get parameter info
  public String[][] getParameterInfo()
  {
    return null;
  }

  public void destroy()
  {
    try{
      simpleClient.sendString("quit");
      simpleClient.stop();
    }
    catch(Exception e)
    {}
  }
  
  void action()
  {
    String str=textField1.getText();
    if(str.equals("")) return;
    try
    {
      if(!login)
      {
        userName=str;
        simpleClient=new SimpleClient(this,hostname,4321);
        simpleClient.sendString("login:%:"+str);
        simpleClient.start();
        login=true;
        label1.setText("消息：");
        button1.setLabel("发言");
        textField1.setText("");
      }
      else
      {
        simpleClient.sendString(userName+":%:"+str);
      }
    }
    catch(Exception ee)
    {
      ee.printStackTrace();
    }
  }

  void button1_actionPerformed(ActionEvent e)
  {
    action();
  }

  void textField1_actionPerformed(ActionEvent e)
  {
    action();
  }
}

class Applet1_button1_actionAdapter implements java.awt.event.ActionListener
{
  Applet1 adaptee;

  Applet1_button1_actionAdapter(Applet1 adaptee)
  {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e)
  {
    adaptee.button1_actionPerformed(e);
  }
}

class Applet1_textField1_actionAdapter implements java.awt.event.ActionListener
{
  Applet1 adaptee;

  Applet1_textField1_actionAdapter(Applet1 adaptee)
  {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e)
  {
    adaptee.textField1_actionPerformed(e);
  }
}