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jdk6.0从入门到精通-----chapter5网络编程 新I/O（含源码下载）

编程网络应用TomcatApacheWeb 
阅读更多
本例向用户通过参数指定的主机端口发送一段请求报文，然后读取和打印反馈报文。综合应用了NIO的缓冲区，通道和字符集。使用到了Tomcat服务器  参数为localhost 8080 

package nio;

import java.io.IOException;
import java.net.UnknownHostException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;

public class ReadURL 
{
  public static void main(String args[]) 
  {
    String host = args[0];
    int port = Integer.parseInt(args[1]);
    SocketChannel channel = null; //所有输入输出通过通道这个对象

    try 
    {
      // Setup
      InetSocketAddress socketAddress = new InetSocketAddress(host, port);//
      Charset charset = Charset.forName("UTF-8");
      CharsetDecoder decoder = charset.newDecoder();
      CharsetEncoder encoder = charset.newEncoder();

      // Allocate buffers
      ByteBuffer buffer = ByteBuffer.allocateDirect(1024);
      CharBuffer charBuffer = CharBuffer.allocate(1024);

      // Connect
      channel = SocketChannel.open();
      channel.connect(socketAddress);

      // Send request
      String request = "GET / \r\n\r\n";
      channel.write(encoder.encode(CharBuffer.wrap(request)));

      // Read response
      while ((channel.read(buffer)) != -1) 
      {
      	buffer.flip();
        // Decode buffer
        decoder.decode(buffer, charBuffer, false);
        // Display
        charBuffer.flip();
        System.out.println(charBuffer);
        buffer.clear();
        charBuffer.clear();
      }
    } 
    catch (UnknownHostException e) 
    {
    	System.err.println(e);
    } 
    catch (IOException e) 
    {
      System.err.println(e);
    } 
    finally 
    {
      if (channel != null) 
      {
        try 
        {
        	channel.close();
        } 
        catch (IOException ignored) 
        {
        }
      }
    }
  }
}


运行后结果 
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lan
g="en">
    <head>
    <title>Apache Tomcat</title>
    <style type="text/css">
    /*<![CDATA[*/
      body {
          color: #000000;
          background-color: #FFFFFF;
	  font-family: Arial, "Times New Roman", Times, serif;
          margin: 10px 0px;
      }

    img {
       border: none;
    }
    
    a:link, a:visited {
        color: blue
    }

    th {
        font-family: Verdana, "Times New Roman", Times, serif;
        font-size: 110%;
        font-weight: normal;
        font-style: italic;
        background: #D2A41C;
        text-align: left;
    }

    td {
        color: #000000;
	font-family: Arial, Helvetica, sans-serif;
    }
    
    td.menu {
        background: #FFDC75;
    }

    .center {
        text-align: center;
    }

    .code {
        color: #000000;
        font-family: "Courier New", Courier, monospace;
        font-size: 110%;
        margin-left: 2.5em;
    }
    
     #banner {
        margin-bottom: 12px;
     }


     p#congrats {
         margin-top: 0;
         font-weight: bold;
         text-align: center;
     }

     p#footer {
         text-align: right;
         font-size: 80%;
     }
     /*]]>*/
   </style>
</head>

<body>

<!-- Header -->
<table id="banner" width="100%">
    <tr>
      <td align="left" style="width:130px">
      <a href="http://tomcat.apache.org/">
        <img src="tomcat.gif" height="92" width="130" alt="The Mighty Tomcat - MEOW!"/>
      </a>
      </td>
      <td align="left" valign="top"><b>Apache Tomcat</b></td>
      <td align="right">
        <a href="http://www.apache.org/">
	  <img src="asf-logo-wide.gif" height="51" width="537" alt="The Apache Software Foundation"/>
	</a>
       </td>
     </tr>
</table>

<table>
    <tr>

        <!-- Table of Contents -->
        <td valign="top">
            <table width="100%" border="1" cellspacing="0" cellpadding="3">
                <tr>
		  <th>Administration</th>
                </tr>
           
     <tr>
		  <td class="menu">
		    <a href="manager/status">Status</a><br/>
                    <!--<a href="admin">Tomcat&nbsp;Administration</a><br/>-->
                    <a href="manager/html">Tomcat&nbsp;Manager</a><br/>
                    &nbsp;
                  </td>
                </tr>
            </table>

	    <br />
            <table width="100%" border="1" cellspacing="0" cellpadding="3">
                <tr>
		  <th>Documentation</th>
                </tr>
                <tr>
                  <td class="menu">
                    <a href="RELEASE-NOTES.txt">Release&nbsp;Notes</a><br/>
                    <a href="docs/changelog.html">Change&nbsp;Log</a><br/>
                    <a href="docs">Tomcat&nbsp;Documentation</a><br/>                        &nbsp;
                    &nbsp;
		    </td>
                </tr>
            </table>
	    
            <br/>
            <table width="100%" border="1" cellspacing="0" cellpadding="3">
                <tr>
  
                <th>Tomcat Online</th>
                </tr>
                <tr>
                  <td class="menu">
                    <a href="http://tomcat.apache.org/">Home&nbsp;Page</a><br/>
		    <a href="http://tomcat.apache.org/faq/">FAQ</a><br/>
                    <
a href="http://tomcat.apache.org/bugreport.html">Bug&nbsp;Database</a><br/>
                    <a href="http://issues.apache.org/bugzilla/buglist.cgi?bug_status=UNCONFIRMED&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=RESOLVED&amp;resolution=LATER&amp;resolution=REMIND&amp;resolution=---&amp;bugidtype=include&amp;product=Tomcat+6&amp;cmdtype=doit&amp;order=Importance">Open Bugs</a><br/>
                    <a href="http://mail-archives.apache.org/mod_mbox/tomcat-users/">Users&nbsp;Mailing&nbsp;List</a><br/>
                    <a href="http://mail-archives.apache.org/mod_mbox/tomcat-dev/">Developers&nbsp;Mailing&nbsp;List</a><br/>
                    <a href="irc://irc.freenode.net/#tomcat">IRC</a><br/>
		    &nbsp;
                  </td>
                </tr>
            </table>
	    
            <br/>
            <table width="100%" border="1" cellspacing="0" cellpadding="3">
                <tr>
		  <th>Miscellaneous</th>
                </tr>
        
        <tr>
                  <td class="menu">
                    <a href="examples/servlets/">Servlets Examples</a><br/>
                    <a href="examples/jsp/">JSP Examples</a><br/>
                    <a href="http://java.sun.com/products/jsp">Sun's&nbsp;Java&nbsp;Server&nbsp;Pages&nbsp;Site</a><br/>
                    <a href="http://java.sun.com/products/servlet">Sun's&nbsp;Servlet&nbsp;Site</a><br/>
    		    &nbsp;
                  </td>
                </tr>
            </table>
        </td>

        <td style="width:20px">&nbsp;</td>
	
        <!-- Body -->
        <td align="left" valign="top">
          <p id="congrats">If you're seeing this page via a web browser, it means you've setup Tomcat successfully. Congratulations!</p>
 
          <p>As you may have guessed by now, this is the default Tomcat home page. It can be found on the local filesystem at:</p>
          <p class="code">$CATALINA_HOME/webapps/ROOT/index.html</p>
	  
          <p>where "$CATALINA_HOME" is
 the root of the Tomcat installation directory. If you're seeing this page, and you don't think you should be, then you're either a user who has arrived at new installation of Tomcat, or you're an administrator who hasn't got his/her setup quite right. Providing the latter is the case, please refer to the <a href="docs">Tomcat Documentation</a> for more detailed setup and administration information than is found in the INSTALL file.</p>

            <p><b>NOTE: For security reasons, using the administration webapp
            is restricted to users with role "admin". The manager webapp
            is restricted to users with role "manager".</b>
            Users are defined in <code>$CATALINA_HOME/conf/tomcat-users.xml</code>.</p>

            <p>Included with this release are a host of sample Servlets and JSPs (with associated source code), extensive documentation, and an introductory guide to developing web applications.</p>

            <p>Tomcat mailing lists are available at the Tomcat project w
eb site:</p>

           <ul>
               <li><b><a href="mailto:users@tomcat.apache.org">users@tomcat.apache.org</a></b> for general questions related to configuring and using Tomcat</li>
               <li><b><a href="mailto:dev@tomcat.apache.org">dev@tomcat.apache.org</a></b> for developers working on Tomcat</li>
           </ul>

            <p>Thanks for using Tomcat!</p>

            <p id="footer"><img src="tomcat-power.gif" width="77" height="80" alt="Powered by Tomcat"/><br/>
	    &nbsp;

	    Copyright &copy; 1999-2007 Apache Software Foundation<br/>
            All Rights Reserved
            </p>
        </td>

    </tr>
</table>

</body>
</html>

该html对应的是Tomcat的主页

第五章所有源码见附件
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| scanner两个例子（转）
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