目前總結了兩種擷取用戶端的公網IP方法。
方法一：通過第三方網站進行擷取()
public static void main(String[] args){
String ip = "";
String chinaz = "http://ip.chinaz.com";
StringBuilder inputLine = new StringBuilder();
String read = "";
URL url = null;
HttpURLConnection urlConnection = null;
BufferedReader in = null;
try {
url = new URL(chinaz);
urlConnection = (HttpURLConnection) url.openConnection();
in = new BufferedReader( new InputStreamReader(urlConnection.getInputStream(),"UTF-8"));
while((read=in.readLine())!=null){
inputLine.append(read+"\r\n");
}
//System.out.println(inputLine.toString());
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(in!=null){
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Pattern p = Pattern.compile("\\
(.*?)\\");
Matcher m = p.matcher(inputLine.toString());
if(m.find()){
String ipstr = m.group(1);
ip = ipstr;
//System.out.println(ipstr);
}
System.out.println(ip);
}
第二種方法：通過http請求頭部擷取(别人測試ok，但本人測試隻能擷取到本機的内網IP)
package com.ehking.commons.web.utils;
import org.apache.commons.lang.StringUtils;
import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.servlet.http.HttpServletRequest;
public class IpUtils {
private IpUtils() {
}
public static String getIpAddr(HttpServletRequest request) {
if (request == null) {
return "unknown";
}
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("X-Forwarded-For");
}
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("X-Real-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
try {
ip = request.getRemoteAddr();
}catch (Throwable e){
e.printStackTrace();
}
if(StringUtils.isBlank(ip)||"127.0.0.1".equals(ip) || "0:0:0:0:0:0:0:1".equals(ip)){
//根據網卡取本機配置的IP
InetAddress inet=null;
try {
inet = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
e.printStackTrace();
}
if(null != inet){
ip= inet.getHostAddress();
}
}
}
if(StringUtils.isNotBlank(ip) && ip.contains(",")){
ip=ip.split(",")[0];
}
return StringUtils.isNotBlank(ip)?ip.trim():null;
}
}