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一个java的web的聊天的程序的客户端

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                  <!-- HEADLINE --> 
                  <td width="494"><font color="#FF3300" size="4" face="宋体"><br>
                    </font><font face="宋体" color="#ff3300" size="5"><b><b>第5页: 
                    连接到闲聊服务器上</b></b></font><font face="宋体"><big><br>
                    </big>作者</font><a href="mailto:[e-mail]"
    title="Send
mail to Brian Slesinsky"><font color="#000000" size="3" face="宋体">Brian Slesinsky</font></a><big><font face="宋体"> 
                    </font></big></td>
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                <!-- SEE ALSO LINKS --> 
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                  <td valign="top" rowspan="2" width="494" bgcolor="#FFFFFF"><font size="3">现在我们已经有了一个用户界面，我们需要将其连接到闲聊服务<br>
                    器上。我们需要有一个套接口，要打开连接，我们需要知道闲聊<br>
                    服务器名称和断口的号码。最好使用小程序的参数，这样在改变<br>
                    参数时无需重新编译该小程序。 
                    <p>如果一个用户离开乐闲聊室，我们需要让闲聊室内的其他人知道<br>
                      该情况，所以用户离开该页面时小程序应该断开同闲聊服务器的<br>
                      连接。所以我们用小程序的<font face="宋体"><tt>start()</tt></font>和<font
    face="宋体"><tt>stop()</tt></font>方法断开和关闭套<br>
                      接口。 </p>
                    <p><font face="宋体"><b>Chat.java:</b> </font></p>
                    <pre><font face="宋体">
import java.applet.Applet;
import java.awt.*;<b>
import java.net.Socket;</b>

public class Chat extends Applet {
  TextArea ta;
  TextField tf;<b>
  Socket s;
</b>

  public void init() {
    ta = new TextArea(&quot;&quot;,20,80);
    ta.setEditable(false);
    add(ta);

    tf = new TextField(80);
    add(tf);
  }
<b>
  public void start() {
    try {
      String host = getParameter(&quot;host&quot;);
      int port = Integer.parseInt(getParameter(&quot;port&quot;));
      s = new Socket(host,port);
    } catch(Exception e) {
      ta.appendText(&quot;applet error: &quot;+e+&quot;\n&quot;);
    }
  }

  public void stop() {
    try {
      s.close();
    } catch(Exception e) {
      ta.appendText(&quot;applet error: &quot;+e+&quot;\n&quot;);
    }
  }
</b>
  public boolean handleEvent(Event e) {
    if(e.id==Event.ACTION_EVENT &amp;&amp; e.target==tf) {
      ta.appendText(tf.getText()+&quot;\n&quot;);
      tf.setText(&quot;&quot;);
      return true;
    }
    return false;
  }

}
</font></pre>
                    <p><font face="宋体"><b>index.html:</b> </font></p>
                    <pre><font face="宋体">
&lt;body bgcolor=&quot;#FFFFFF&quot;&gt;
&lt;applet code=&quot;Chat&quot; width=600 height=400&gt;<b>
&lt;param name=host value=&quot;somewhere.hotwired.com&quot;&gt;
&lt;param name=port value=&quot;2323&quot;&gt;</b>
[Chat applet]
&lt;/applet&gt;
&lt;/body&gt;
</font></pre>
                    <p><font face="宋体">(</font>这里是修改后的<a
    href="http://www.hotwired.com/webmonkey/code/97/24/applets/4.html" target="other">小程序</a>。<font
    face="宋体">) </font></p>
                    </font> 
                    <p><font size="3">第<font face="宋体">1</font>页：<a href="index.html">闲聊服务器的<font
    face="宋体">Java</font>客户端</a><br>
                      第<font face="宋体">2</font>页：</font><font size="3" face="宋体"><a
    href="index2a_page2.htm">'Hello World' 测试</a><b><br>
                      </b>第3页：<a href="index2a_page3.htm">设置该'Chat'的面貌</a><br>
                      第4页：<a href="index2a_page4.htm">处理Input事件</a><br>
                      第5页：<a href="index2a_page5.htm">连接到闲聊服务器上</a><br>
                      第6页：<a href="index2a_page6.htm">传输文本</a><br>
                      第7页：<a href="index2a_page7.htm">Java的移植性</a><br>
                      第8页：<a href="index2a_page8.htm">最后的工作</a><br>
                      </font>
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