📄 02-套接字编程(上2).htm
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<TD>Socket s = new Socket ("198.163.227.6", 13);<BR>InputStream is = s.getInputStream ();<BR>// Read from the stream.<BR>is.close ();<BR>s.close ();</TD></TR></TBODY></TABLE><BR> 接下面我们将示范一个流套接字的客户程序，这个程序将创建一个Socket对象，Socket将访问运行在指定主机端口10000上的服务程序，如果访问成功客户程序将给服务程序发送一系列命令并打印服务程序的响应。List2使我们创建的程序SSClient的源代码：<BR><BR> Listing 2: SSClient.java<BR>
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<TD>// SSClient.java<BR><BR>import java.io.*;<BR>import java.net.*; <BR><BR>class SSClient<BR>{<BR> public static void main (String [] args)<BR> {<BR> String host = "localhost";<BR><BR> // If user specifies a command-line argument, that argument<BR> // represents the host name.<BR><BR> if (args.length == 1)<BR> host = args [0];<BR><BR> BufferedReader br = null;<BR> PrintWriter pw = null;<BR> Socket s = null;<BR><BR> try<BR> {<BR> // Create a socket that attempts to connect to the server<BR> // program on the host at port 10000.<BR><BR> s = new Socket (host, 10000);<BR><BR> // Create an input stream reader that chains to the socket's<BR> // byte-oriented input stream. The input stream reader<BR> // converts bytes read from the socket to characters. The<BR> // conversion is based on the platform's default character<BR> // set.<BR><BR> InputStreamReader isr;<BR> isr = new InputStreamReader (s.getInputStream ());<BR><BR> // Create a buffered reader that chains to the input stream<BR> // reader. The buffered reader supplies a convenient method<BR> // for reading entire lines of text.<BR><BR> br = new BufferedReader (isr);<BR><BR> // Create a print writer that chains to the socket's byte-<BR> // oriented output stream. The print writer creates an<BR> // intermediate output stream writer that converts<BR> // characters sent to the socket to bytes. The conversion<BR> // is based on the platform's default character set.<BR><BR> pw = new PrintWriter (s.getOutputStream (), true);<BR><BR> // Send the DATE command to the server.<BR><BR> pw.println ("DATE");<BR><BR> // Obtain and print the current date/time.<BR><BR> System.out.println (br.readLine ());<BR> // Send the PAUSE command to the server. This allows several<BR> // clients to start and verifies that the server is spawning<BR> // multiple threads.<BR><BR> pw.println ("PAUSE");<BR> // Send the DOW command to the server.<BR><BR> pw.println ("DOW");<BR><BR> // Obtain and print the current day of week.<BR><BR> System.out.println (br.readLine ());<BR><BR> // Send the DOM command to the server.<BR> <BR> pw.println ("DOM");<BR><BR> // Obtain and print the current day of month.<BR><BR> System.out.println (br.readLine ());<BR><BR> // Send the DOY command to the server.<BR><BR> pw.println ("DOY");<BR><BR> // Obtain and print the current day of year.<BR><BR> System.out.println (br.readLine ());<BR> }<BR> catch (IOException e)<BR> {<BR> System.out.println (e.toString ());<BR> }<BR> finally<BR> {<BR> try<BR> {<BR> if (br != null)<BR> br.close ();<BR><BR> if (pw != null)<BR> pw.close ();<BR><BR> if (s != null)<BR> s.close ();<BR> }<BR> catch (IOException e)<BR> {<BR> }<BR> }<BR> }<BR>}</TD></TR></TBODY></TABLE><BR> 运行这段程序将会得到下面的结果：<BR><BR>
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<TD>Tue Jan 29 18:11:51 CST 2002<BR>TUESDAY<BR>29<BR>29</TD></TR></TBODY></TABLE><BR> SSClient创建了一个Socket对象与运行在主机端口10000的服务程序联系，主机的IP地址由host变量确定。SSClient将获得Socket的输入输出流，围绕BufferedReader的输入流和PrintWriter的输出流对字符串进行读写操作就变得非常容易，SSClient个服务程序发出各种date/time命令并得到响应，每个响应均被打印，一旦最后一个响应被打印，将执行Try/Catch/Finally结构的Finally子串，Finally子串将在关闭Socket之前关闭BufferedReader 和 PrintWriter。<BR><BR> 在SSClient源代码编译完成后，可以输入java SSClient 来执行这段程序，如果有合适的程序运行在不同的主机上，采用主机名/IP地址为参数的输入方式，比如www.sina.com.cn是运行服务器程序的主机，那么输入方式就是java SSClient www.sina.com.cn。<BR><BR> <B>技巧</B><BR><BR> Socket类包含了许多有用的方法。比如getLocalAddress()将返回一个包含客户程序IP地址的InetAddress子类对象的引用;getLocalPort()将返回客户程序的端口号;getInetAddress()将返回一个包含服务器IP地址的InetAddress子类对象的引用；getPort()将返回服务程序的端口号。<br><br> </DIV> </TD> </TR> <TR> <TD class=center01> <div align="center">来源：天极网 作者：<div> </TD> <TD width="280" class=center01> <div align="center"> <font color=#0000FF><a href='chapter.php?id=387&volume=3&chapter=1'>上一页</a></font> <font color=#0000FF><a href="serialize.php?id=387">回书目</a></font> <font color=#0000FF><a href='chapter.php?id=387&volume=3&chapter=3'>下一页</a></font> </div> </TD> </TR> </TBODY></TABLE><table><tr><td width="760"> <table width="760" height="10" border="0" cellpadding="0" cellspacing="0"> <tr> <td></td> </tr> </table> <!------------ 评论 ----------------> <table width="760" border="0" cellpadding="0" cellspacing="0"> <tr> <td><iframe width="100%" id=vs frameborder=0 scrolling=no src="comment_list1.php?id=387"></iframe> </td> </tr> </table><br><script language=javascript>function CheckNetwordForm(theForm){ if("" == theForm.content.value) { alert("写两句吧~~"); theForm.content.focus(); return false; } var index; for(index=0;index<theForm.content.value.length;index++) { if(" " != theForm.content.value.charAt(index)) break; } if(index == theForm.content.value.length) { alert("写两句吧~~"); theForm.content.focus(); return false; } if (theForm.content.value.length>100){ alert("评论字数不能超过100哦"); theForm.content.focus(); return false; } return true;}</script> <!------------------ 评论 ---------------> <form name=netword method=post action="insertnetword.php" onsubmit="javascript: return CheckNetwordForm(this);"> <table width="760" border="0" cellpadding="0" cellspacing="0"> <tr> <td height="25" class="text6"> 给此书打分：<a name="1"></a> <select name="score"> <option value=5 selected>非常好</option> <option value=4>还凑合</option> <option value=3>一般吧</option> <option value=2>不太行</option> <option value=1>太差了</option> </select> 用户名： <input name="id" value=387 type="hidden" id="id"> <input name="backurl" value=/book/chapter.php?id=387&volume=3&chapter=2 type="hidden"> <input name="username" type="text" id="username" size="20" maxlength="20"> <font color="#666666">*评论字数请控制在一百字以内</font> </td> </tr> </table> <br> <textarea name="content" cols="80" rows="4" wrap="OFF" id="description"></textarea> <input type="submit" name="Submit" value="提交"> </form> </td> </tr></table></td></tr></table> <TABLE cellSpacing=0 cellPadding=0 width=760 border=0> <TBODY> <TR> <TD width="1003" height=9 background=images/t_bj01.gif><IMG height=1 src="images/ccc.gif" width=1></TD> </TR> </TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 width=760 bgColor=#ffffff border=0> <TBODY> <TR> <TD><HR width=760 noShade SIZE=1> </TD> </TR> <TR> <TD align=middle><A class=black href="http://www.chinaren.com/" target=_blank>ChinaRen</A> - <A class=black href="http://big5.www.sohu.com/" target=_blank>繁体版</A> - <A class=black href="http://hr.sohu.com/hrm.html" target=_blank>搜狐招聘</A> - <A class=black href="http://add.sohu.com/" target=_blank>网站登录</A> - <A class=black href="http://help.sohu.com/" target=_blank>帮助中心</A> - <A class=black href="http://book.news.sohu.com/onClick=this.style.behavior='url(#default#homepage)';this.setHomePage('http://www.sohu.com');return" target=_blank false;>设置首页</A> - <A class=black href="http://adinfo.sohu.com/" target=_blank>广告服务</A> - <A class=black href="http://www.sohu.com/about/lianxi.htm" target=_blank>联系方式</A> - <A class=black href="http://www.sohu.com/about/privacy.html" target=_blank>保护隐私权</A> - <A class=black href="http://www.sohu.com/about/" target=_blank>About SOHU</A> - <A class=black href="http://www.sohu.com/about/" target=_blank>公司介绍</A><BR> <SPAN class=eng>Copyright © 2004 Sohu.com Inc. All rights reserved. 搜狐公司 版权所有</SPAN> </TD> </TR> </TBODY></TABLE></center></body></html><script language="JavaScript" src="http://nielsen.js.sohu.com/nnselect.js"></script><noscript><img src='http://ping.nnselect.com/ping.gif?c=119' height='1' width='1'></noscript>⌨️ 快捷键说明
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