为了方便，不想修改JSP代码，所以直接编写JSP代码。日后只要复制过去就可以测试服务器相关信息。
(说明：本人不会JAVA，第一次编写JSP，只是测试使用）
效果如下：
代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ page import="java.util.*" %>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge"/>
<title>sunday tomcat</title>
<meta name="Author" content="centos,yum,update" />
<meta charset="utf-8" />
<link rel="shortcut icon" href="images/itour.ico" />
</head>
<body>
<br><br><br>
<%
//HttpSession session = request.getSession(true);
System.out.println(session.getId());
//out.println("<br> SESSION ID:" + session.getId()+"<br>");
String serverName = request.getServerName();
int serverPort = request.getServerPort();
%>
<table width="80%" border="1" align="center">
<tr>
<th colspan=2>tomcat test by linwangyi</th>
</tr>
<tr>
<td>服务器IP</td>
<td><% String serverIP = request.getLocalAddr();
out.print( serverIP);%></td>
</tr>
<tr>
<td>服务器tomcat端口</td>
<td><% int serverPORT = request.getLocalPort();
out.print( serverPORT);%></td>
</tr>
<tr>
<td>访问主机名称</td>
<td><%=serverName%></td>
</tr>
<tr>
<td>访问端口</td>
<td><%=serverPort%></td>
</tr>
<tr>
<td>根目录绝对路径</td>
<td><%out.print( application.getRealPath(request.getRequestURI()) );%> </td>
</tr>
<tr>
<td>SESSION ID</td>
<td><%=session.getId()%></td>
</tr>
<tr>
<th colspan=2>客户端信息</th>
</tr>
<tr>
<td>客户端IP</td>
<td><%
String USERHeader=request.getHeader("x-forwarded-for");
if (USERHeader != null) {
out.print( request.getHeader("x-forwarded-for") );
} else {
out.print( request.getRemoteAddr() );
}
%></td>
</tr>
<tr>
<td>User-Agent信息</td>
<td><% String USERAgent = request.getHeader("User-Agent");
out.print( USERAgent);%></td>
</tr>
</table>
</body>
</html>