chapter8.htm

这是一个学写JAVA的好东西

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			<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3）</div>
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            <br>&nbsp;&nbsp;&nbsp;&nbsp;<P>一旦拥有了URI对象，你就可以通过调用getAuthority()、getFragment()、getHost()、getPath()、getPort()、getQuery()、getScheme()、getSchemeSpecificPart()和 getUserInfo()方法提取多种组件。你也可以通过调用isAbsolute()确定该URI是绝对的还是相对的，通过调用isOpaque()确定该URI是不透明的还是分层的。如果返回值是true意味着该URI是绝对的或不透明的，如果返回值是false意味着该URI是相对的或分层的。<BR><BR>　　列表1中的程序用命令行参数建立了一个URI对象，调用URI组件提取方法来检索URI的组件，并调用URI的isAbsolute()和isOpaque()方法把该URI分类为绝对的/相对性和不透明的/分层的。<BR><BR>　　列表1: URIDemo1.java<BR><BR></P>
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<TD>// URIDemo1.java<BR><BR>import java.net.*;<BR><BR>class URIDemo1<BR>{<BR>public static void main (String [] args) throws Exception<BR>{<BR>if (args.length != 1)<BR>{<BR>System.err.println ("usage: java URIDemo1 uri");<BR>return;<BR>}<BR><BR>URI uri = new URI (args [0]);<BR><BR>System.out.println ("Authority = " +uri.getAuthority ());<BR>System.out.println ("Fragment = " +uri.getFragment ());<BR>System.out.println ("Host = " +uri.getHost ());<BR>System.out.println ("Path = " +uri.getPath ());<BR>System.out.println ("Port = " +uri.getPort ());<BR>System.out.println ("Query = " +uri.getQuery ());<BR>System.out.println ("Scheme = " +uri.getScheme ());<BR>System.out.println ("Scheme-specific part = " +<BR>uri.getSchemeSpecificPart ());<BR>System.out.println ("User Info = " +uri.getUserInfo ());<BR>System.out.println ("URI is absolute: " +uri.isAbsolute ());<BR>System.out.println ("URI is opaque: " +uri.isOpaque ());<BR>}<BR>}</TD></TR></TBODY></TABLE><BR>　　输入java URIDemo1命令后，列表1的输出结果如下：<BR><BR>
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<TD>query://[e-mail]:9000/public/manuals/appliances?stove#ge:<BR>Authority = [e-mail]:9000<BR>Fragment = ge<BR>Host = books.com<BR>Path = /public/manuals/appliances<BR>Port = 9000<BR>Query = stove<BR>Scheme = query<BR>//[e-mail]:9000/public/manuals/appliances?stove<BR>User Info = jeff<BR>URI is absolute: true<BR>URI is opaque: false</TD></TR></TBODY></TABLE>
<P><BR>　　上面的输出显示该URI是绝对的，因为它指定了一个大纲（query），并且该URI是分层的，因为query后面有/符号。<BR><BR>　　<B>技巧</B><BR><BR>　　你应该调用URI的compareTo(Object o)和equals(Object o)来决定URI的次序（为了排序目的）和等同性。你可以参考SDK文档，查阅这些方法的更多信息</P><br><br>
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