IP 来访记录并查询 IP 所属地

在服务代码中加入过滤器 IP 地址记录，一般情况知道 IP 然而不知道 IP 所属地区的问题。
直接贴关键代码：

	/**
	 * 获取用户真实ip地址 
	 */
	public static String getIpAddress(HttpServletRequest request) {
		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_CLIENT_IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		if (ip == null || ip.length() == 0) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}

​

关键一步，怎么用 IP 获取 IP 所属地？
这里可以巧妙的用 http://ip.cn/index.php 这个网站。

	/**根据ip获取所在地*/
	public static String getAreaByIp(String ip){
		if ("0:0:0:0:0:0:0:1".equals(ip) 
			|| "127.0.0.1".equals(ip) 
			|| "localhost".equals(ip)) 
			return "本地";
		try {
			// 用Jsoup，模拟客户端爬取数据
			Document doc=Jsoup.connect("http://ip.cn/index.php?ip="+ip)
					.header("accept", "*/*")
					.header("connection", "Keep-Alive")
					.header("user-agent", "Mozilla/4.0 (compatible;MSIE 6.0;Windows NT 5.1;SV1)")
					.timeout(1_0000).get();
					
			// 查找元素的语句，和jQuery一样，很容易上手
			String area="p:contains(地理位置) code";
			Elements es=doc.select(area);
			return es.text();
		} catch (Exception e) {
			//System.err.println(e.getMessage());
			//e.printStackTrace();
		}
		return null;
	}
​

jsoup 处理 html 神器！！！