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📁 精通struts源码,孙卫琴.经过更新后的,请查收,
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<title>新时代软件教程:操作系统 主页制作 服务器 设计软件 网络技术 编程语言 文字编辑</title>
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    <p align="center"><big><strong>jsp源码实例3(获取jsp各种参数）</strong></big></p>

<div align="right">（文/blackwhites）</div>

<p>
package coreservlets;<br>
<br>
import java.io.*;<br>
import javax.servlet.*;<br>
import javax.servlet.http.*;<br>
import java.util.*;<br>
<br>
/** Creates a table showing the current value of each<br>
 *&nbsp;&nbsp;of the standard CGI variables.<br>
 *&nbsp;&nbsp;&lt;P&gt;<br>
 *&nbsp;&nbsp;Taken from Core Servlets and JavaServer Pages<br>
 *&nbsp;&nbsp;from Prentice Hall and Sun Microsystems Press,<br>
 *&nbsp;&nbsp;http://www.coreservlets.com/.<br>
 *&nbsp;&nbsp;&amp;copy; 2000 Marty Hall; may be freely used or adapted.<br>
 */<br>
<br>
public class ShowCGIVariables extends HttpServlet {<br>
&nbsp;&nbsp;public void doGet(HttpServletRequest request,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HttpServletResponse response)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;throws ServletException, IOException {<br>
&nbsp;&nbsp;&nbsp;&nbsp;response.setContentType(&quot;text/html&quot;);<br>
&nbsp;&nbsp;&nbsp;&nbsp;PrintWriter out = response.getWriter();<br>
&nbsp;&nbsp;&nbsp;&nbsp;String[][] variables =<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ { &quot;AUTH_TYPE&quot;, request.getAuthType() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;CONTENT_LENGTH&quot;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String.valueOf(request.getContentLength()) },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;CONTENT_TYPE&quot;, request.getContentType() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;DOCUMENT_ROOT&quot;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;getServletContext().getRealPath(&quot;/&quot;) },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;PATH_INFO&quot;, request.getPathInfo() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;PATH_TRANSLATED&quot;, request.getPathTranslated() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;QUERY_STRING&quot;, request.getQueryString() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;REMOTE_ADDR&quot;, request.getRemoteAddr() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;REMOTE_HOST&quot;, request.getRemoteHost() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;REMOTE_USER&quot;, request.getRemoteUser() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;REQUEST_METHOD&quot;, request.getMethod() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;SCRIPT_NAME&quot;, request.getServletPath() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;SERVER_NAME&quot;, request.getServerName() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;SERVER_PORT&quot;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String.valueOf(request.getServerPort()) },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;SERVER_PROTOCOL&quot;, request.getProtocol() },<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ &quot;SERVER_SOFTWARE&quot;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;getServletContext().getServerInfo() }<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};<br>
&nbsp;&nbsp;&nbsp;&nbsp;String title = &quot;Servlet Example: Showing CGI Variables&quot;;<br>
&nbsp;&nbsp;&nbsp;&nbsp;out.println(ServletUtilities.headWithTitle(title) +<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;&lt;BODY BGCOLOR=\&quot;#FDF5E6\&quot;&gt;\n&quot; +<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;&lt;H1 ALIGN=\&quot;CENTER\&quot;&gt;&quot; + title + &quot;&lt;/H1&gt;\n&quot; +<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;&lt;TABLE BORDER=1 ALIGN=\&quot;CENTER\&quot;&gt;\n&quot; +<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;&lt;TR BGCOLOR=\&quot;#FFAD00\&quot;&gt;\n&quot; +<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;&lt;TH&gt;CGI Variable Name&lt;TH&gt;Value&quot;);<br>
&nbsp;&nbsp;&nbsp;&nbsp;for(int i=0; i&lt;variables.length; i++) {<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String varName = variables[i][0];<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String varValue = variables[i][1];<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (varValue == null)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;varValue = &quot;&lt;I&gt;Not specified&lt;/I&gt;&quot;;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(&quot;&lt;TR&gt;&lt;TD&gt;&quot; + varName + &quot;&lt;TD&gt;&quot; + varValue);<br>
&nbsp;&nbsp;&nbsp;&nbsp;}<br>
&nbsp;&nbsp;&nbsp;&nbsp;out.println(&quot;&lt;/TABLE&gt;&lt;/BODY&gt;&lt;/HTML&gt;&quot;);<br>
&nbsp;&nbsp;}<br>
<br>
&nbsp;&nbsp;/** POST and GET requests handled identically. */<br>
&nbsp;&nbsp;<br>
&nbsp;&nbsp;public void doPost(HttpServletRequest request,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HttpServletResponse response)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;throws ServletException, IOException {<br>
&nbsp;&nbsp;&nbsp;&nbsp;doGet(request, response);<br>
&nbsp;&nbsp;}<br>
}<br>
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