📄 outputinfo.java
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import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
import java.util.*;
public class OutputInfo extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out=resp.getWriter();
Enumeration headNames=req.getHeaderNames();
out.println("<html><head>");
out.println("<title>Info Page</title>");
out.println("</head>");
out.println("<body><center>");
out.println("<table border=1 align=center>");
out.println("<caption>Servlet接收到的HTTP消息报头的信息</caption>");
out.println("<tr bgcolor=#999999>");
out.println("<th>消息报头的名字</th>");
out.println("<th>消息报头的值</th>");
out.println("</tr>");
while(headNames.hasMoreElements())
{
String name=(String)headNames.nextElement();
String value=req.getHeader(name);
out.println("<tr>");
out.println("<td>"+name+"</td>");
out.println("<td>"+value+"</td>");
out.println("</tr>");
}
out.println("</table><p>");
out.println("<table border=1 align=center>");
out.println("<caption>其它访问信息</caption>");
out.println("<tr>");
out.println("<td>客户端的IP地址</td>");
out.println("<td>"+req.getRemoteAddr()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>客户端的端口号</td>");
out.println("<td>"+req.getRemotePort()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>服务器端的IP地址</td>");
out.println("<td>"+req.getLocalAddr()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>服务器端的端口号</td>");
out.println("<td>"+req.getLocalPort()+"</td>");
out.println("</tr>");
out.println("</table>");
out.println("</center></body></html>");
out.close();
}
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