📄 chapter3.htm
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.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=3'>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=5'>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的网络功能与编程(4)</div> <DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 10.5pt; COLOR: black; LINE-HEIGHT: 180%" align=left> <br> <P><STRONG>五、显示网络上其他HTML文档</STRONG> <BR><BR> 利用Java提供的getAppletContext().showDocument(URL)可以显示其他结点的HTML文档，同前面的显示网络上其他结点的图象，有两种格式，下面各举一例： <BR><BR> ●程序8 格式一 <BR><BR></P>
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<TD>import java.applet.*; <BR>import java.awt.*; <BR>import java.net.*; <BR>public class showdoc extends Applet <BR>{ <BR>URL docur= null; <BR>public void paint(Graphics g) { <BR>try { <BR>docur=new URL("http://www.shu.edu.cn/~xyx/doc/manhua.html"); <BR>} <BR>catch (MalformedURLException e) { <BR>System.out.println("Can&acute;t open the URL "); <BR>} <BR>if (docur != null) { <BR>getAppletContext().showDocument(docur,"_blank"); <BR>} <BR>} <BR>} </TD></TR></TBODY></TABLE><BR> ●程序9 格式二 <BR><BR>
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<TD>import java.applet.*; <BR>import java.awt.*; <BR>import java.net.*; <BR>public class showdoc2 extends Applet <BR>{ <BR>URL docur= null; <BR>public void paint(Graphics g) { <BR>try { <BR>getAppletContext().showDocument(new URL("http://www.shu.edu.cn/ <BR>~xyx/doc/manhua.html")); <BR>} <BR>catch (MalformedURLException e) { <BR>System.out.println("Can&acute;t open the URL "); <BR>} <BR>} <BR>} </TD></TR></TBODY></TABLE><BR> <B>六、读取网络上文件内容 </B><BR><BR> 前述的网络功能只是显示或播放网络上结点的图象、 声音及HTML文档，并没有对其内容进行处理。事实上，Java还可读取网络上文件的内容，并对其内容进行处理。 <BR><BR> 读取网络上文件内容的步骤可如下： <BR><BR> 1. 创建一个URL类型的对象 <BR><BR> 如： <BR><BR>
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<TD>String url = "ftp://202.120.127.218/incoming/test/readtxt.html"; <BR>URL fileur; <BR>try { <BR>fileur = new URL(url); } <BR>catch ( MalformedURLException e) { <BR>System.out.println("Can&acute;t get URL: " ); <BR>} </TD></TR></TBODY></TABLE><BR> 2. 利用URL类的openStream()，获得对应的InputStream类的对象，如： <BR><BR>
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<TD>InputStream filecon = fileur.openStream(); </TD></TR></TBODY></TABLE><BR> 3. 将InputStream对象转化为DataInputStream类的对象，如： <BR><BR>
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<TD>DataInputStream filedata = new DataInputStream(filecon);</TD></TR></TBODY></TABLE><BR> 4. 读取内容 <BR><BR> 如对前面的filedata，可用filedata.readLine() 一行一行读取内容，或用filedata.readchar一个字符一个字符读取内容。 对读取到的内容，可由Java Applet进行各种处理， 并将处理结果用各种方式显示出来。 <BR><BR> 下面的例子是读取 http://www.shu.edu.cn/~xyx/doc/manhua.html文件内容的例子，为简洁起见，该例中只将文件的内容逐行读出，并在文本区显示出来。 <BR><BR> ●程序10 <BR><BR>
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<TD>import java.io.*; <BR>import java.net.*; <BR>import java.awt.*; <BR>import java.applet.*; <BR><BR>public class showfile extends Applet{ <BR>URL fileur; <BR>TextArea showarea = new TextArea("Please wait a while for get <BR>text",10,70); <BR>public void init() { <BR>String url = "http://www.shu.edu.cn/~xyx/doc/manhua.html"; <BR>try { fileur = new URL(url); } <BR>catch ( MalformedURLException e) { <BR>System.out.println("Can&acute;t get URL: " ); <BR>} <BR><BR>add(showarea); <BR><BR>} <BR><BR>public void paint(Graphics g) { <BR>InputStream filecon = null; <BR>DataInputStream filedata = null; <BR>String fileline; <BR>try { <BR>filecon = fileur.openStream(); <BR>filedata = new DataInputStream(filecon); <BR>while ((fileline = filedata.readLine()) != null) { <BR>showarea.appendText(fileline+"\n"); <BR>} <BR>} <BR>catch (IOException e) { <BR>System.out.println("Error in I/O:" + e.getMessage()); <BR>} <BR>} <BR>} </TD></TR></TBODY></TABLE><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=3'>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=5'>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=4 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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