Java如何获取用户访问IP及地理位置

/** 
 * 获取用户ip地址 
 * @return 
 */ 
public static String getIp(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(); 
  } 
  return ip; 
}

/** 
 * 读取 
 *  
 * @param rd 
 * @return 
 * @throws IOException 
 */ 
private static String readAll(Reader rd) throws IOException { 
	StringBuilder sb = new StringBuilder(); 
	int cp; 
	while ((cp = rd.read()) != -1) { 
		sb.append((char) cp); 
	} 
	return sb.toString(); 
} 
  
/** 
 * 创建链接 
 *  
 * @param url 
 * @return 
 * @throws IOException 
 * @throws JSONException 
 */ 
private static JSONObject readJsonFromUrl(String url) throws IOException, JSONException { 
	InputStream is = new URL(url).openStream(); 
	try { 
		BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); 
		String jsonText = readAll(rd); 
		JSONObject json = JSONObject.parseObject(jsonText); 
		return json; 
	} finally { 
		is.close(); 
	} 
}

/** 
 * 百度获取城市信息 
 *  
 * @param ip 
 * @return 
 * @throws JSONException 
 * @throws IOException 
 */ 
public static void main(String[] args) throws JSONException, IOException { 
	String ip = ""; 
	// 百度地图申请的ak 
	String ak = ""; 
	// 这里调用百度的ip定位api服务 详见 http://api.map.baidu.com/lbsapi/cloud/ip-location-api.htm 
	JSONObject json = readJsonFromUrl("http://api.map.baidu.com/location/ip?ip="+ip+"&ak="+ak); 
	 
  //这里只取出了两个参数，根据自己需求去获取 
  JSONObject obj = (JSONObject) ((JSONObject) json.get("content")).get("address_detail"); 
	String province = obj.getString("province"); 
	System.out.println(province); 
	 
	JSONObject obj2 = (JSONObject) json.get("content"); 
	String address = obj2.getString("address"); 
	System.out.println(address); 
}

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.Reader; 
import java.net.URL; 
import java.nio.charset.Charset; 
  
import com.alibaba.fastjson.JSONArray; 
import com.alibaba.fastjson.JSONException; 
import com.alibaba.fastjson.JSONObject; 
  
public class pc1 { 
	/** 
	 * 读取 
	 *  
	 * @param rd 
	 * @return 
	 * @throws IOException 
	 */ 
	private static String readAll(Reader rd) throws IOException { 
		StringBuilder sb = new StringBuilder(); 
		int cp; 
		while ((cp = rd.read()) != -1) { 
			sb.append((char) cp); 
		} 
		return sb.toString(); 
	} 
	 
	/** 
	 * 创建链接 
	 *  
	 * @param url 
	 * @return 
	 * @throws IOException 
	 * @throws JSONException 
	 */ 
	private static JSONArray readJsonFromUrl(String url) throws IOException, JSONException { 
		InputStream is = new URL(url).openStream(); 
		try { 
			BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); 
			String jsonText = readAll(rd); 
			JSONArray json = JSONArray.parseArray(jsonText); 
			return json; 
		} finally { 
			is.close(); 
		} 
	} 
  
	/** 
	 * 获取城市信息 
	 *  
	 * @param ip 
	 * @return 
	 * @throws JSONException 
	 * @throws IOException 
	 */ 
	public static void main(String[] args) throws JSONException, IOException { 
		String ip = "122.189.200.141"; 
		JSONArray json = readJsonFromUrl("http://freeapi.ipip.net/"+ip); 
		String a1 = (String)json.get(0); 
		String a2 = (String)json.get(1); 
		String a3 = (String)json.get(2); 
		String a4 = (String)json.get(3); 
		String a5 = (String)json.get(4); 
		System.out.println(a1); 
		System.out.println(a2); 
		System.out.println(a3); 
		System.out.println(a4); 
		System.out.println(a5); 
	} 
}