java获取当前网络ip地址

这篇是碰巧用到这个功能，，总结下，借鉴了大佬的代码，文末注明来源

1.

package com.jk.utils;
 
import java.net.InetAddress;
import java.net.UnknownHostException;
 
import javax.servlet.http.HttpServletRequest;
 
public class IpUtil {
 
	/** 
     * 获取当前网络ip 
     * @param request 
     * @return 
     */  
    public static String getIpAddr(HttpServletRequest request){  
        String ipAddress = request.getHeader("x-forwarded-for");  
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                ipAddress = request.getHeader("Proxy-Client-IP");  
            }  
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                ipAddress = request.getHeader("WL-Proxy-Client-IP");  
            }  
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                ipAddress = request.getRemoteAddr();  
                if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){  
                    //根据网卡取本机配置的IP  
                    InetAddress inet=null;  
                    try {  
                        inet = InetAddress.getLocalHost();  
                    } catch (UnknownHostException e) {  
                        e.printStackTrace();  
                    }  
                    ipAddress= inet.getHostAddress();  
                }  
            }  
            //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
            if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15  
                if(ipAddress.indexOf(",")>0){  
                    ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));  
                }  
            }  
            return ipAddress;   
    }
}

2.

import java.net.InetAddress;
import java.net.UnknownHostException;

public class Test {

	
	public static void main(String[] args) {
		
		try {
			//根据域名查找主机的IP地址(由于可能有多个服务器，ip地址并不是唯一的，要想获取准确的，还需要获取所有的地址才行)
			InetAddress inetAddress=InetAddress.getByName("www.baidu.com");
			System.out.println(inetAddress);//结果：14.215.177.38
			//反向查找主机名
			InetAddress byName = InetAddress.getByName("113.105.245.103");
			System.out.println("反向查找主机名：   "+byName.getHostName());//如果没有主机名，会返回IP地址
			
			//得到主机的所有地址
			InetAddress[] inetAddresses=InetAddress.getAllByName("www.taobao.com");
			for (InetAddress address : inetAddresses) {
				System.out.println(address);
			}
			
			//getLocalHost获取当前主机名和IP地址
			InetAddress me = InetAddress.getLocalHost();//得到主机名/IP地址 的形式
			System.out.println(me);//如果电脑没有联网，会返回127.0.0.1
			System.out.println(me.getHostName());//得到主机名
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

参考：https://blog.csdn.net/sxj_world/article/details/79107413
https://blog.csdn.net/shenhaiyushitiaoyu/article/details/84061999