获取request的变量

由于IP代码未实现，先注释掉。

  1 package com.helloweenvsfei.servlet;
  2 
  3 import java.io.IOException;
  4 import java.io.PrintWriter;
  5 import java.security.Principal;
  6 import java.util.Locale;
  7 
  8 import javax.servlet.ServletException;
  9 import javax.servlet.http.HttpServlet;
 10 import javax.servlet.http.HttpServletRequest;
 11 import javax.servlet.http.HttpServletResponse;
 12 
 13 public class RequestServlet extends HttpServlet {
 14 
 15     private String getAccept(String accept) {
 16         StringBuffer buffer = new StringBuffer();
 17         if (accept.contains("image/gif"))
 18             buffer.append("GIF文件,");
 19         if (accept.contains("image/x-xbitmap"))
 20             buffer.append("BPM文件,");
 21         if (accept.contains("image/jpeg"))
 22             buffer.append("JPG文件");
 23         if (accept.contains("application/vnd.ms-excel"))
 24             buffer.append("Excel 文件, ");
 25         if (accept.contains("application/vnd.ms-powerpoint"))
 26             buffer.append("PPT 文件, ");
 27         if (accept.contains("application/msword"))
 28             buffer.append("Word 文件, ");
 29         return buffer.toString().replaceAll(", $", "");
 30     }
 31 
 32     private String getLocale(Locale locale) {
 33         if (Locale.SIMPLIFIED_CHINESE.equals(locale))
 34             return "简体中文";
 35         if (Locale.TRADITIONAL_CHINESE.equals(locale))
 36             return "繁体中文";
 37         if (Locale.ENGLISH.equals(locale))
 38             return "英文";
 39         if (Locale.JAPANESE.equals(locale))
 40             return "日文";
 41         return "未知语言环境";
 42     }
 43 
 44     // private String getAddress(String ip){
 45     // return IpUtil.getIpAddress(ip);
 46     // }
 47 
 48     private String getNavigator(String userAgent) {
 49         if (userAgent.indexOf("TencentTraveler") > 0)
 50             return "腾讯浏览器";
 51         if (userAgent.indexOf("Maxthon") > 0)
 52             return "Maxthon浏览器";
 53         if (userAgent.indexOf("MyIE2") > 0)
 54             return "MyIE2浏览器";
 55         if (userAgent.indexOf("Firefox") > 0)
 56             return "Firefox浏览器";
 57         if (userAgent.indexOf("MSIE") > 0)
 58             return "IE 浏览器";
 59         return "未知浏览器";
 60     }
 61 private String getOS(String userAgent){
 62     if(userAgent.indexOf("Windows NT 5.1") > 0)    return "Windows XP";
 63     if(userAgent.indexOf("Windows 98") > 0)    return "Windows 98";
 64     if(userAgent.indexOf("Windows NT 5.0") > 0)    return "Windows 2000";
 65     if(userAgent.indexOf("Linux") > 0)    return "Linux";
 66     if(userAgent.indexOf("Unix") > 0)    return "Unix";
 67     return "未知";
 68 }
 69 public void doGet(HttpServletRequest request,HttpServletResponse response)
 70 throws ServletException,IOException{
 71     request.setCharacterEncoding("UTF-8");
 72     response.setCharacterEncoding("UTF-8");
 73 
 74     response.setContentType("text/html");
 75     
 76     String authType = request.getAuthType();
 77     String localAddr = request.getLocalAddr();
 78     Locale locale = request.getLocale();
 79     String localName = request.getLocalName();
 80     String contextPath = request.getContextPath();
 81     int localPort = request.getLocalPort();
 82     String method = request.getMethod();
 83     String pathInfo = request.getPathInfo();
 84     String pathTranslated = request.getPathTranslated();
 85     String protocol = request.getProtocol();
 86     String queryString = request.getQueryString();
 87     String remoteAddr = request.getRemoteAddr();
 88     int port = request.getRemotePort();
 89     String remoteUser = request.getRemoteUser();
 90     String requestedSessionId = request.getRequestedSessionId();
 91     String requestURI = request.getRequestURI();
 92     StringBuffer requestURL = request.getRequestURL();
 93     String scheme = request.getScheme();
 94     String serverName = request.getServerName();
 95     int serverPort = request.getServerPort();
 96     String servletPath = request.getServletPath();
 97     Principal userPrincipal = request.getUserPrincipal();
 98     
 99     String accept = request.getHeader("accept");
100     String referer = request.getHeader("referer");
101     String userAgent = request.getHeader("user-agent");
102     
103     String serverInfo = this.getServletContext().getServerInfo();
104     
105     PrintWriter out = response.getWriter();
106     out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
107     out.println("<HTML>");
108     
109     // 这里<title></title>之间的信息在浏览器中显示为标题
110     out.println("  <HEAD><TITLE>Request Servlet</TITLE></HEAD>");
111     out.println("  <style>body, font, td, div {font-size:12px; line-height:18px; }</style>");
112     out.println("  <BODY>");
113     
114     out.println("<b>您的IP为</b> " + remoteAddr +  "<b>；您使用</b> " + getOS(userAgent) + " <b>操作系统</b>，" + getNavigator(userAgent) + " <b>。您使用</b> " + getLocale(locale) + "。<br/>");
115     out.println("<b>服务器IP为</b> " + localAddr + "<b>；服务器使用</b> " + serverPort + " <b>端口，您的浏览器使用了</b> " + port + " <b>端口访问本网页。</b><br/>");
116     out.println("<b>服务器软件为</b>：" + serverInfo + "。<b>服务器名称为</b> " + localName + "。<br/>");
117     out.println("<b>您的浏览器接受</b> " + getAccept(accept) + "。<br/>");
118     out.println("<b>您从</b> " + referer + " <b>访问到该页面。</b><br/>");
119     out.println("<b>使用的协议为</b> " + protocol + "。<b>URL协议头</b> " + scheme + "，<b>服务器名称</b> " + serverName + "，<b>您访问的URI为</b> " + requestURI + "。<br/>" );
120     out.println("<b>该 Servlet 路径为</b> " + servletPath + "，<b>该 Servlet 类名为</b> " + this.getClass().getName() + "。<br/>");
121     out.println("<b>本应用程序在硬盘的根目录为</b> " + this.getServletContext().getRealPath("") + "，<b>网络相对路径为</b> " + contextPath + "。 <br/>");
122     
123     out.println("<br/>");
124             
125     out.println("<br/><br/><a href=" + requestURI + "> 点击刷新本页面 </a>");
126     
127     out.println("  </BODY>");
128     out.println("</HTML>");
129     out.flush();
130     out.close();
131 }
132 }
RequestServlet.java
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>FirstServlet</servlet-name>
        <servlet-class>com.helloweenvsfei.servlet.FirstServlet</servlet-class>
        <init-param>
            <param-name>message</param-name>
            <param-value>welcome to FirstServlet</param-value>
        </init-param>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet>
        <servlet-name>RequestServlet</servlet-name>
        <servlet-class>com.helloweenvsfei.servlet.RequestServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>FirstServlet</servlet-name>
        <url-pattern>/servlet/FirstServlet</url-pattern>
        <url-pattern>/servlet/FirstServlet.asp</url-pattern>
        <url-pattern>/servlet/FirstServlet.php</url-pattern>
        <url-pattern>/servlet/FirstServlet.jsp</url-pattern>
        <url-pattern>/servlet/FirstServlet.aspx</url-pattern>
    </servlet-mapping>
        <servlet-mapping>
        <servlet-name>RequestServlet</servlet-name>
        <url-pattern>/servlet/RequestServlet</url-pattern>
    </servlet-mapping>
</web-app>
web.xml

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原文地址：https://www.cnblogs.com/ys-wuhan/p/5893166.html