RequestListener 學習筆記-記錄來訪者IP
阿新 • • 發佈：2018-04-20
RequestListener 學習筆記
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpServletRequest;
public class CallListener implements ServletRequestListener {
private static Map<String, String> map = new HashMap<String, String>();
// 實例變量
private int counter;
static {
map.put("127.0.0.1", "北京");
map.put("192.168.11.96", "深圳");
map.put("192.168.11.113", "中山");
map.put("192.168.11.124", "珠海");
}
@Override
public void requestInitialized(ServletRequestEvent sre) {
// 取得事件源,即ServletRequest對象
HttpServletRequest request = (HttpServletRequest) sre
.getServletRequest();
// 取得客戶端IP
String ip = request.getRemoteAddr();
// 通過ip查詢歸屬地
String address = map.get(ip);
if (address == null) {
address = "北京";
}
// 通過ip查詢歸屬地
request.setAttribute("ip", ip);
request.setAttribute("address", address);
}
@Override
public void requestDestroyed(ServletRequestEvent sre) {
}
}index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP ‘index.jsp‘ starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> 您的IP地址：${ip }<br/> 歸屬地：${requestScope.address}<br/> </body> </html>
RequestListener 學習筆記-記錄來訪者IP