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A.navigater:hover { COLOR: #cc0000}.g1 { FONT-SIZE: 14px}.g2 { PADDING-LEFT: 21px; PADDING-TOP: 5px}.g3 { FONT-WEIGHT: bold; COLOR: #ab6503}.g4 { COLOR: #ff0000}.img { BORDER-RIGHT: #800000 1px solid; BORDER-TOP: #800000 1px solid; BORDER-LEFT: #800000 1px solid; BORDER-BOTTOM: #800000 1px solid}.img1 { BORDER-RIGHT: #000000 1px solid; BORDER-TOP: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-BOTTOM: #000000 1px solid}.f14 { FONT-SIZE: 14px; LINE-HEIGHT: 26px}.f20 { FONT-WEIGHT: bold; FONT-SIZE: 20px}.top_red { COLOR: #d70709; TEXT-DECORATION: none}.center01 { COLOR: #000000; LINE-HEIGHT: 20px}.center01 TD { COLOR: #000000; LINE-HEIGHT: 20px}.center01 A:link { COLOR: #000000; TEXT-DECORATION: none}.center01 A:visited { COLOR: #000000; TEXT-DECORATION: none}.center01 A:hover { COLOR: #2b7128; TEXT-DECORATION: underline}.center02 { COLOR: #194e00; LINE-HEIGHT: 20px}.center02 TD { COLOR: #194e00; LINE-HEIGHT: 20px}.center02 A:link { COLOR: #194e00; TEXT-DECORATION: none}.center02 A:visited { COLOR: #194e00; TEXT-DECORATION: none}.center02 A:hover { COLOR: #194e00; TEXT-DECORATION: underline}--></style><TABLE width=760 border=0 align=center cellPadding=0 cellSpacing=0 bgcolor="#F3F3F3" valign="top"> <tr class="center01"> <td width="488" style="padding-left:10px;padding-top:10px"> <a href="index.php">连载</a> > <a href="slist.php?class1=6">程序设计</a> > <a href="slist.php?class2=7">Java</a> > <a href="serialize.php?id=387">Java网络编程专辑</a> </td> <td width="280" style="padding-left:10px;padding-top:10px"> <div align="center"> <font color=#0000FF><a href='chapter.php?id=387&volume=1&chapter=9'>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=1&chapter=11'>下一页</a></font> </div> </td> </tr> <tr class="center01"> <td colspan="2" align="center" style="padding-left:10px;padding-top:10px"> </td> </tr> <TBODY> <TR> <TD colspan="2" align=middle> <BR> <div style="FONT-SIZE: 18pt; COLOR: #990000; FONT-FAMILY: 楷体_GB2312" align=center><B>基础知识</b></div><br><div style="COLOR: #990000; font-family: ; font-size: 18px;宋体;" align=center>Java网络编程之URI、URL研究（上4）</div> <DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 10.5pt; COLOR: black; LINE-HEIGHT: 180%" align=left> <br> <P><SPAN class=f14>URI类支持基本的URI操作，包括标准化（normalization）、分解（resolution）和相对化（relativization）。标准化是通过URI的normalize()方法支持的。调用normalize()时，它返回对新URI对象的引用，该对象包含调用的URI对象的URI的标准的表现。<BR><BR> 列表2演示了normalize()方法。它把URI作为程序的唯一的参数，URIDemo2打印出标准的相等的URI。<BR><BR> 列表2: URIDemo2.java<BR><BR></P>
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<TD>// URIDemo2.java<BR><BR>import java.net.*;<BR><BR>class URIDemo2<BR>{<BR>public static void main (String [] args) throws Exception<BR>{<BR>if (args.length != 1)<BR>{<BR>System.err.println ("usage: java URIDemo2 uri");<BR>return;<BR>}<BR><BR>URI uri = new URI (args [0]);<BR><BR>System.out.println ("Normalized URI = " +<BR>uri.normalize ().toString ());<BR>}<BR>} </TD></TR></TBODY></TABLE><BR> 在编译URIDemo2后，在命令行输入java URIDemo2 x/y/../z/./q，将看到下面的输出：<BR><BR>Normalized URI = x/z/q<BR><BR> 上面的输出显示y、..和.消失了。这是因为..意味着你想直接在x下面访问名字空间的z部分，.意味着你希望访问与z部分相关的名字空间的q部分。<BR><BR> URI通过提供resolve(String uri)、resolve(URI uri)和relativize(URI uri)方法支持反向解析和相对化操作。如果uri引用是空的（null）这三个方法都会产生NullPointerException对象。同样，如果指定的URI违反了RFC 2396语法规则，resolve(String uri)通过的内部的create(String uri)调用间接地产生一个IllegalArgumentException对象。<BR><BR> 列表3的代码演示了resolve(String uri)和relativize(URI uri)。<BR><BR> 列表3: URIDemo3.java<BR><BR>
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<TD>// URIDemo3.java<BR><BR>import java.net.*;<BR><BR>class URIDemo3<BR>{<BR>public static void main (String [] args) throws Exception<BR>{<BR>if (args.length != 2)<BR>{<BR>System.err.println ("usage: " +<BR>"java URIDemo3 uriBase uriRelative");<BR>return;<BR>}<BR><BR>URI uriBase = new URI (args [0]);<BR>System.out.println ("Base URI = " +uriBase.toString ());<BR><BR>URI uriRelative = new URI (args [1]);<BR>System.out.println ("Relative URI = " +uriRelative.toString ());<BR><BR>URI uriResolved = uriBase.resolve (uriRelative);<BR>System.out.println ("Resolved URI = " +uriResolved.toString ());<BR><BR>URI uriRelativized = uriBase.relativize (uriResolved);<BR>System.out.println ("Relativized URI = " +uriRelativized.toString ());<BR>}<BR>}</TD></TR></TBODY></TABLE><BR> 在编译URIDemo3后，在命令行输入java URIDemo3 http://www.somedomain.com/ x/../y. ，输出如下：<BR><BR>
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<TD>Base URI = http://www.somedomain.com/<BR>Relative URI = x/../y<BR>Resolved URI = http://www.somedomain.com/y<BR>Relativized URI = y</TD></TR></TBODY></TABLE><BR> 上面的输出显示相对的URI的x/../y根据基础URI http://www.somedomain.com/分解并（在内部）标准化，取得了已分解的http://www.somedomain.com/URI。给定该URI和基础URI，该已分解的URI根据基础URI相对化获得了y，它是原始的但是标准的相对的URI。<BR><BR> <B>技巧</B><BR><BR> 调用URI的toURL()方法把URI转换为URL。<BR><BR> 在本周日的专题中我将向读者介绍如何使用URL以及MIME（多用途的网际邮件扩充协议）的概念以及它如何与URL发生联系,敬请期待。</SPAN><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=1&chapter=9'>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=1&chapter=11'>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=1&chapter=10 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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