通过前端获取客户端ip和所在城市，并在后端获得这些值

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一：jsp的代码：

<%@ 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"><body>    <div id="allmap"></div></body><html>  <head>    <script language="javascript" src="http://www.codefans.net/ajaxjs/jquery1.3.2.js"></script>    <script type="text/javascript" src="/js/jquery-1.8.3.min.js"></script>    <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=7hofO0Vu1ecpKW4O3pvsXc39"></script>    <title>获取IP和当前城市</title>    <script type="text/javascript">    // 百度地图API功能    var map = new BMap.Map("allmap");    var city=null;    function myFun(result){        var cityName = result.name;        map.setCenter(cityName);        document.getElementById('city').value=cityName;        city = cityName;        return cityName;    }    var myCity = new BMap.LocalCity();    myCity.get(myFun);</script>    <script language="javascript">    jQuery(function($){    var url = 'http://chaxun.1616.net/s.php?type=ip&output=json&callback=?&_='+Math.random();     $.getJSON(url, function(data){      document.getElementById("ip").value=data.Ip       ip = document.getElementById("ip").value;       myCity.get(myFun);    $.post("address_getIpAddress.action",    {    ip:data.Ip,    city:city    },    function(data,status){    //alert("Data: " + data + "\nStatus: " + status);  });    });})</script>  </head>  <body>    <form action="address_getIpAddress.action" method="post">        你的ip：<input type="text" id="ip" name ="ip" class="ip">        你的位置：<input type="text" id="city" name ="city" class="city">        <input type="submit" >    </form>  </body></html>

二：后台的代码：

package com.jfl.web;import java.io.PrintStream;import java.io.PrintWriter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.catalina.deploy.ContextService;import org.apache.jasper.tagplugins.jstl.core.Out;import org.apache.struts2.ServletActionContext;import com.jfl.util.Utli;import com.opensymphony.xwork2.ActionSupport;public class CommonAction extends ActionSupport{    public String getIpAddress() throws Exception{        HttpServletRequest request = ServletActionContext.getRequest();        String ipp = request.getParameter("ip");        String city = request.getParameter("city");        System.out.println(ipp);        System.out.println(city);        HttpServletResponse response = ServletActionContext.getResponse();        PrintWriter out = response.getWriter();        out.printf("jfl");        return null;    }   }

三：运行的结果：
①页面结果：
这里写图片描述
②控制台输出结果：

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