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  • 获取本机的ip地址(排除虚拟机,蓝牙等ip)

    项目中遇到了要获取本地ip的需求,网上查找资料遇到很多坑,很多Java获取本机ip地址的方法要么是根本获取不到,要么是获取的有问题。
    网上常见的方法如下

    InetAddress.getLocalHost().getHostAddress() 
    

    但是如果电脑里面有Lan,WIFI,蓝牙热点,虚拟机网卡,即存在很多的网络接口(network interfaces),每个网络接口就包含一个IP地址,并不是所有的IP地址能被外部或局域网访问,比如说虚拟机网卡地址等等。上面获取到的ip就会有误。

    下面是正确的获取ip地址的方法,亲测无误:

    方法一:
    import java.net.InetAddress;
    import java.net.NetworkInterface;
    import java.net.UnknownHostException;
    import java.util.Enumeration;
    
    public class getRealIp {
    	public static void main(String[] args) {
    	    try {
    	        // 正确的IP拿法
    	        System.out.println("get LocalHost LAN Address : " + getLocalHostLANAddress().getHostAddress());
    	    } catch (UnknownHostException e) {
    	        e.printStackTrace();
    	    }
    	}
    
    	// 正确的IP拿法,即优先拿site-local地址
    	private static InetAddress getLocalHostLANAddress() throws UnknownHostException {
    	    try {
    	        InetAddress candidateAddress = null;
    	        // 遍历所有的网络接口
    	        for (Enumeration ifaces = NetworkInterface.getNetworkInterfaces(); ifaces.hasMoreElements();) {
    	            NetworkInterface iface = (NetworkInterface) ifaces.nextElement();
    	            // 在所有的接口下再遍历IP
    	            for (Enumeration inetAddrs = iface.getInetAddresses(); inetAddrs.hasMoreElements();) {
    	                InetAddress inetAddr = (InetAddress) inetAddrs.nextElement();
    	                if (!inetAddr.isLoopbackAddress()) {// 排除loopback类型地址
    	                    if (inetAddr.isSiteLocalAddress()) {
    	                        // 如果是site-local地址,就是它了
    	                        return inetAddr;
    	                    } else if (candidateAddress == null) {
    	                        // site-local类型的地址未被发现,先记录候选地址
    	                        candidateAddress = inetAddr;
    	                    }
    	                }
    	            }
    	        }
    	        if (candidateAddress != null) {
    	            return candidateAddress;
    	        }
    	        // 如果没有发现 non-loopback地址.只能用最次选的方案
    	        InetAddress jdkSuppliedAddress = InetAddress.getLocalHost();
    	        if (jdkSuppliedAddress == null) {
    	            throw new UnknownHostException("The JDK InetAddress.getLocalHost() method unexpectedly returned null.");
    	        }
    	        return jdkSuppliedAddress;
    	    } catch (Exception e) {
    	        UnknownHostException unknownHostException = new UnknownHostException(
    	                "Failed to determine LAN address: " + e);
    	        unknownHostException.initCause(e);
    	        throw unknownHostException;
    	    }
    	}
    }
    

    参考博客地址:https://blog.csdn.net/u011809209/article/details/77236602

    这里插上一句,上面的方法之前在java项目中能准确获取到ip,但是放在项目中之后,又不能获取准确的ip,也是很迷,然后又另外找了一种方法,如下:

    方法二:
    import java.net.Inet4Address;
    import java.net.InetAddress;
    import java.net.NetworkInterface;
    import java.net.SocketException;
    import java.util.Enumeration;
     
    /**
     * 获取本地真正的IP地址,即获得有线或者无线WiFi地址。
     * 过滤虚拟机、蓝牙等地址
     */
    public class getRealLocalIP {
     
    	public static String getRealIP() {
    		try {
    			Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface
    					.getNetworkInterfaces();
    			while (allNetInterfaces.hasMoreElements()) {
    				NetworkInterface netInterface = (NetworkInterface) allNetInterfaces
    						.nextElement();
     
    				// 去除回环接口,子接口,未运行和接口
    				if (netInterface.isLoopback() || netInterface.isVirtual()
    						|| !netInterface.isUp()) {
    					continue;
    				}
    				
    				if (!netInterface.getDisplayName().contains("Intel")
    						&& !netInterface.getDisplayName().contains("Realtek")) {
    					continue;
    				}
    				Enumeration<InetAddress> addresses = netInterface
    						.getInetAddresses();
    				System.out.println(netInterface.getDisplayName());
    				while (addresses.hasMoreElements()) {
    					InetAddress ip = addresses.nextElement();
    					if (ip != null) {
    						// ipv4
    						if (ip instanceof Inet4Address) {
    							System.out.println("ipv4 = " + ip.getHostAddress());
    							return ip.getHostAddress();
    						}
    					}
    				}
    				break;
    			}
    		} catch (SocketException e) {
    			System.err.println("Error when getting host ip address"
    					+ e.getMessage());
    		}
    		return null;
    	}
    }
    

    参考博客地址:https://blog.csdn.net/yinshuomail/article/details/81624648

    总之网上比较靠谱的方法就找到这两种,感谢其他博主的博客。

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  • 原文地址:https://www.cnblogs.com/ghq120/p/9572871.html
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