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Java獲取本機IP地址的方法代碼示例(內(nèi)網(wǎng)、公網(wǎng))

 更新時間：2024年07月23日 10:28:57   作者：EIL_XU_  
在IT領(lǐng)域獲取本機IP地址是一項基礎(chǔ)但重要的任務(wù),特別是在網(wǎng)絡(luò)編程、遠(yuǎn)程協(xié)作和設(shè)備通信中,這篇文章主要給大家介紹了關(guān)于Java獲取本機IP地址的方法(內(nèi)網(wǎng)、公網(wǎng)),需要的朋友可以參考下

起因是公司一個springboot項目啟動類打印了本機IP地址加端口號，方便訪問項目頁面，但是發(fā)現(xiàn)打印出來的不是“無線局域網(wǎng)”的ip而是“以太網(wǎng)適配器”ip，如下圖所示

這樣就導(dǎo)致后續(xù)本地起項目連接xxl-job注冊節(jié)點的時候因為不在同個局域網(wǎng)下ping不通出問題，所以需要解決一下。

一、直接獲取本機IP（會受到虛擬機干擾）

public static String getInterIP1() throws Exception {
    return InetAddress.getLocalHost().getHostAddress();
}

二、獲取本機IP（排除虛擬機干擾）

public static InetAddress getLocalHostLANAddress() throws UnknownHostException {
        try {
            InetAddress candidateAddress = null;
            // 遍歷所有的網(wǎng)絡(luò)接口
            for (Enumeration ifaces = NetworkInterface.getNetworkInterfaces(); ifaces.hasMoreElements();) {
                NetworkInterface iface = (NetworkInterface) ifaces.nextElement();
                // 在所有的接口下再遍歷IP
                for (Enumeration inetAddrs = iface.getInetAddresses(); inetAddrs.hasMoreElements();) {
                    InetAddress inetAddr = (InetAddress) inetAddrs.nextElement();
                    if (!inetAddr.isLoopbackAddress()) {// 排除loopback類型地址
                        if (inetAddr.isSiteLocalAddress()) {
                            // 如果是site-local地址，就是它了
                            return inetAddr;
                        } else if (candidateAddress == null) {
                            // site-local類型的地址未被發(fā)現(xiàn)，先記錄候選地址
                            candidateAddress = inetAddr;
                        }
                    }
                }
            }
            if (candidateAddress != null) {
                return candidateAddress;
            }
            // 如果沒有發(fā)現(xiàn) non-loopback地址.只能用最次選的方案
            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;
        }
    }

三、獲取本機公網(wǎng)IP

public static String getOutIP() {
    try {
        URL whatismyip = new URL("http://checkip.amazonaws.com");
        BufferedReader in = new BufferedReader(new InputStreamReader(whatismyip.openStream()));

        String ip = in.readLine();
        return ip;

        } catch (Exception e) {}

        return "";
}

四、測試

public class IpTest {

        public static void main(String[] args) throws Exception {
            System.out.println("獲取本機ip: " + getInterIP1());
//            System.out.println("getInterIP2: " + getInterIP2());
            System.out.println("獲取本機ip（排除虛擬機干擾）: " + String.valueOf(getLocalHostLANAddress()).substring(1));
//            System.out.println("getOutIPV4: " + getOutIPV4());
            System.out.println("獲取本機公網(wǎng)ip: " + getOutIP());
        }

        public static String getInterIP1() throws Exception {
            return InetAddress.getLocalHost().getHostAddress();
        }

    public static InetAddress getLocalHostLANAddress() throws UnknownHostException {
        try {
            InetAddress candidateAddress = null;
            // 遍歷所有的網(wǎng)絡(luò)接口
            for (Enumeration ifaces = NetworkInterface.getNetworkInterfaces(); ifaces.hasMoreElements();) {
                NetworkInterface iface = (NetworkInterface) ifaces.nextElement();
                // 在所有的接口下再遍歷IP
                for (Enumeration inetAddrs = iface.getInetAddresses(); inetAddrs.hasMoreElements();) {
                    InetAddress inetAddr = (InetAddress) inetAddrs.nextElement();
                    if (!inetAddr.isLoopbackAddress()) {// 排除loopback類型地址
                        if (inetAddr.isSiteLocalAddress()) {
                            // 如果是site-local地址，就是它了
                            return inetAddr;
                        } else if (candidateAddress == null) {
                            // site-local類型的地址未被發(fā)現(xiàn)，先記錄候選地址
                            candidateAddress = inetAddr;
                        }
                    }
                }
            }
            if (candidateAddress != null) {
                return candidateAddress;
            }
            // 如果沒有發(fā)現(xiàn) non-loopback地址.只能用最次選的方案
            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;
        }
    }
    
        public static String getOutIP() {
            try {
                URL whatismyip = new URL("http://checkip.amazonaws.com");
                BufferedReader in = new BufferedReader(new InputStreamReader(whatismyip.openStream()));

                String ip = in.readLine();
                return ip;
//                System.out.println("Public IP Address: " + ip);
            } catch (Exception e) {
//                System.out.println("Error occurred: " + e.getMessage());
            }
            return "";
        }

}
獲取本機ip: 172.17.16.1
獲取本機ip（排除虛擬機干擾）: 192.168.100.100
獲取本機公網(wǎng)ip: 14.145.43.147

這里打印出來的便對應(yīng)上前言命令行截圖里的ip信息，然后公網(wǎng)ip對應(yīng)的是百度搜索ip查到的公網(wǎng)ip地址 

五、手動禁用虛擬機排除干擾

除了用代碼邏輯排除虛擬機干擾，我們也可以直接禁用電腦的虛擬機適配器。

步驟：

  • win+R 
  • devmgmt.msc 打開設(shè)備管理器
  • 找到網(wǎng)絡(luò)適配器-Hyper-V Virtual 開頭的  右鍵禁用

此時win+R cmd 輸入ipconfig，可以看到已經(jīng)沒有虛擬機ip了

此時java使用

InetAddress.getLocalHost().getHostAddress()

也可以獲取到192.168開頭的wifi地址了

總結(jié)

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