用servlet获得服务器和客户端信息

本文介绍了一个简单的Servlet示例,该示例用于获取HTTP请求中的服务器相关信息,包括服务器名称、IP地址、端口等,并通过HTML页面展示这些信息。

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package com.lzg.webproject1;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GetServerInfoServlet extends HttpServlet {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     *
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out
                .println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.println(" <table>");
        printContent(request, out);
        out.println("  </table>");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }
    public void printContent(HttpServletRequest request,PrintWriter out)
    {
        Enumeration e = request.getHeaderNames();
        out.println("server name:"+request.getServerName()+"</br>");
        out.println("server ip"+request.getRemoteAddr()+"</br>");
        out.println("server port"+request.getServerPort()+"</br>");
        out.println("server protocol:"+request.getRemoteAddr()+"</br>");
        out.println("server contextpath:"+request.getContextPath()+"</br>");
        out.println("server scheme:"+request.getScheme()+"</br>");
        out.println("server method:"+request.getMethod()+"</br>");
        out.println("server uri:"+request.getRequestURI()+"</br>");
        String name = "";
        while (e.hasMoreElements())
        {
            name = (String)e.nextElement();
            out.println(name+":"+request.getHeader(name)+"</br>");
           
        }
       
    }

}

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