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📄 简单的用 java socket 编写的 http 服务器应用,帮助学习http协议.htm

📁 自己平时从网上搜集的http协议解析文档
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style="COLOR: #000000">&lt;br&gt;这是个会反馈&nbsp;404&nbsp;错误的的图片:&lt;img&nbsp;src='test.jpg'&gt;&lt;br&gt;&lt;a&nbsp;href='test.jpg'&gt;点击打开test.jpg&lt;/a&gt;&lt;br&gt;</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">&lt;form&nbsp;method=post&nbsp;action='/'&gt;POST&nbsp;表单&nbsp;&lt;input&nbsp;name=username&nbsp;value='用户'&gt;&nbsp;&lt;input&nbsp;name=submit&nbsp;type=submit&nbsp;value=submit&gt;&lt;/form&gt;</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.close();<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;closeSocket(client);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">catch</SPAN><SPAN 
style="COLOR: #000000">(Exception&nbsp;e)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">HTTP服务器错误:</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">+</SPAN><SPAN 
style="COLOR: #000000">e.getLocalizedMessage());<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000">System.out.println(client+"连接到HTTP服务器");</SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000">如果加入这一句,服务器响应速度会很慢</SPAN><SPAN 
style="COLOR: #008000"><BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">catch</SPAN><SPAN 
style="COLOR: #000000">(Exception&nbsp;e)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">HTTP服务器错误:</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">+</SPAN><SPAN 
style="COLOR: #000000">e.getLocalizedMessage());<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">/**</SPAN><SPAN 
style="COLOR: #008000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;关闭客户端&nbsp;socket&nbsp;并打印一条调试信息.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;</SPAN><SPAN 
style="COLOR: #808080">@param</SPAN><SPAN 
style="COLOR: #008000">&nbsp;socket&nbsp;客户端&nbsp;socket.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">*/</SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">void</SPAN><SPAN 
style="COLOR: #000000">&nbsp;closeSocket(Socket&nbsp;socket)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">try</SPAN><SPAN 
style="COLOR: #000000">&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;socket.close();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">catch</SPAN><SPAN 
style="COLOR: #000000">&nbsp;(IOException&nbsp;ex)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ex.printStackTrace();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(socket&nbsp;</SPAN><SPAN 
style="COLOR: #000000">+</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">离开了HTTP服务器</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">/**</SPAN><SPAN 
style="COLOR: #008000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;读取一个文件的内容并返回给浏览器端.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;</SPAN><SPAN 
style="COLOR: #808080">@param</SPAN><SPAN 
style="COLOR: #008000">&nbsp;fileName&nbsp;文件名<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;</SPAN><SPAN 
style="COLOR: #808080">@param</SPAN><SPAN 
style="COLOR: #008000">&nbsp;socket&nbsp;客户端&nbsp;socket.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">*/</SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">void</SPAN><SPAN 
style="COLOR: #000000">&nbsp;fileService(String&nbsp;fileName,&nbsp;Socket&nbsp;socket)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">try</SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PrintStream&nbsp;out&nbsp;</SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">new</SPAN><SPAN 
style="COLOR: #000000">&nbsp;PrintStream(socket.getOutputStream(),&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">true</SPAN><SPAN 
style="COLOR: #000000">);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;File&nbsp;fileToSend&nbsp;</SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">new</SPAN><SPAN 
style="COLOR: #000000">&nbsp;File(fileName);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">if</SPAN><SPAN 
style="COLOR: #000000">(fileToSend.exists()&nbsp;</SPAN><SPAN 
style="COLOR: #000000">&amp;&amp;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #000000">!</SPAN><SPAN 
style="COLOR: #000000">fileToSend.isDirectory())<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">HTTP/1.0&nbsp;200&nbsp;OK</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">);</SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000">返回应答消息,并结束应答</SPAN><SPAN 
style="COLOR: #008000"><BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">Content-Type:application/binary</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">Content-Length:</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">+</SPAN><SPAN 
style="COLOR: #000000">&nbsp;fileToSend.length());</SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000">&nbsp;返回内容字节数</SPAN><SPAN 
style="COLOR: #008000"><BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println();</SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000">&nbsp;根据&nbsp;HTTP&nbsp;协议,&nbsp;空行将结束头信息</SPAN><SPAN 
style="COLOR: #008000"><BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FileInputStream&nbsp;fis&nbsp;</SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">new</SPAN><SPAN 
style="COLOR: #000000">&nbsp;FileInputStream(fileToSend);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">byte</SPAN><SPAN 
style="COLOR: #000000">&nbsp;data[]&nbsp;</SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">new</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">byte</SPAN><SPAN 
style="COLOR: #000000">[fis.available()];<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fis.read(data);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.write(data);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.close();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fis.close();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">catch</SPAN><SPAN 
style="COLOR: #000000">(Exception&nbsp;e)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">传送文件时出错:</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">+</SPAN><SPAN 
style="COLOR: #000000">&nbsp;e.getLocalizedMessage());<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">/**</SPAN><SPAN 
style="COLOR: #008000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;打印用途说明.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">*/</SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">private</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">static</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">void</SPAN><SPAN 
style="COLOR: #000000">&nbsp;usage()&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">Usage:&nbsp;java&nbsp;HTTPServer&nbsp;&lt;port&gt;\nDefault&nbsp;port&nbsp;is&nbsp;80.</SPAN><SPAN 
style="COLOR: #000000">"</SPAN><SPAN 
style="COLOR: #000000">);<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">/**</SPAN><SPAN 
style="COLOR: #008000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;启动简易&nbsp;HTTP&nbsp;服务器<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;</SPAN><SPAN 
style="COLOR: #808080">@param</SPAN><SPAN 
style="COLOR: #008000">&nbsp;args&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #008000">*/</SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">public</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">static</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">void</SPAN><SPAN 
style="COLOR: #000000">&nbsp;main(String[]&nbsp;args)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">try</SPAN><SPAN 
style="COLOR: #000000">&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">if</SPAN><SPAN 
style="COLOR: #000000">(args.length&nbsp;</SPAN><SPAN 
style="COLOR: #000000">!=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">1</SPAN><SPAN 
style="COLOR: #000000">)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;usage();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">else</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN 
style="COLOR: #000000">(args.length&nbsp;</SPAN><SPAN 
style="COLOR: #000000">==</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">1</SPAN><SPAN 
style="COLOR: #000000">)&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PORT&nbsp;</SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN
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