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一个java的web的聊天的程序的客户端

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                  <td width="494"><font color="#FF3300" size="4" face="宋体"><br>
                    </font><font face="宋体" color="#ff3300" size="5"><b><b>第8页：最后的工作&nbsp; 
                    </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"> 
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                  <td valign="top" rowspan="2" width="494" bgcolor="#FFFFFF"><font size="3">最后要做的是将用户输入的文字传输到闲聊服务器，以使用户可以登录并同其他人聊天。这里是完整的小程序代码。 
                    <p><font face="宋体"><b>Chat.java</b> </font></p>
                    <pre><font face="宋体">
import java.applet.Applet;
import java.awt.*;
import java.net.Socket;
import java.io.InputStream;<b>
import java.io.OutputStream;</b>

public class Chat extends Applet implements Runnable {
  TextArea ta;
  TextField tf;
  Socket s;
  Thread t;<b>
  OutputStream os;</b>

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

    tf = new TextField(80);
    add(tf);
  }

  public void start() {
    try {
      String host = getParameter(&quot;host&quot;);
      int port = Integer.parseInt(getParameter(&quot;port&quot;));
      s = new Socket(host,port);<b>
      os = s.getOutputStream();</b>
      t = new Thread(this);
      t.start();
    } catch(Exception e) {
      ta.appendText(&quot;applet error: &quot;+e+&quot;\n&quot;);
    }
  }

  public void stop() {
    try {
      t.stop();
      s.close();
    } catch(Exception e) {
      ta.appendText(&quot;applet error: &quot;+e+&quot;\n&quot;);
    }
  }

  public void run() {
    try {
      InputStream is = s.getInputStream();
      byte[] buf = new byte[200];

      while(true) {
        int avail = is.available();
        if(avail&lt;1) avail=1;
        if(avail&gt;buf.length) avail=buf.length;
        int bytes_read = is.read(buf,0,avail);
        int j = 0;
        for(int i=0; i&lt;bytes_read; i++) {
          if(buf[i]!='\r') {
            buf[j++] = buf[i];
          }
        }
        ta.appendText(new String(buf, 0, 0, j));
      }
    } catch(Exception e) {
      System.err.print(e);
    }
  }
<b>
  byte[] linebuffer = new byte[80];
  public boolean handleEvent(Event e) {
    if(e.id==Event.ACTION_EVENT &amp;&amp;
       e.target==tf) {

      String line = tf.getText();
      int len = line.length();
      if(len&gt;linebuffer.length-1) len = linebuffer.length-1;
      line.getBytes(0, len, linebuffer, 0);
      linebuffer[len] = '\n';
      try {
        os.write(linebuffer, 0, len+1);
      } catch(Exception ex) {
        System.err.print(ex);
      }
      tf.setText(&quot;&quot;);
      return true;
    }
    return false;
  }</b>
}
</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/7.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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