好得很程序员自学网

<tfoot draggable='sEl'></tfoot>

Java 获取本机IP地址的实例代码

前言

在Java中如何准确的获取到本机IP地址呢?网上大部分的做法是 InetAddress.getLocalHost().getHostAddress() 。这的确能获取到本机IP地址,但是是不准确的。因为忽略了一个问题,网络环境是多变的,一台计算机不同的网卡有多个IP地址,Lan、WiFi、蓝牙、热点、虚拟机网卡等。

一、规则

127.xxx.xxx.xxx 属于 [loopback] 地址,即只能你自己的本机可见,就是本机地址,比较常见的有 127.0.0.1 192.168.xxx.xxx 属于 private 私有地址 (site local address),属于本地组织内部访问,只能在本地局域网可见 同样 10.xxx.xxx.xxx、从 172.16.xxx.xxx 到172.31.xxx.xxx 都是私有地址,也是属于组织内部访问 169.254.xxx.xxx 属于连接本地地址(link local IP),在单独网段可用 从 224.xxx.xxx.xxx 到 239.xxx.xxx.xxx 属于组播地址 比较特殊的 255.255.255.255 属于广播地址 除此之外的地址就是点对点的可用的公开 IPv4 地址

二、获取

1.使用

?

1

2

3

public static void main(String[] args) throws SocketException {

        System.out.println( IpUtil.getLocalIp4Address().get().toString().replaceAll( "/" , "" ));

    }

2.工具类

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

package com.dingwen.test.utils;

import org.springframework.util.ObjectUtils;

import java.net.*;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.List;

import java.util.Optional;

/**

  * 获取本机IP 地址

  *

  * @author dingwen

  * 2021.04.28 11:49

  */

public class IpUtil {

     /*

      * 获取本机所有网卡信息   得到所有IP信息

      * @return Inet4Address>

      */

     public static List<Inet4Address> getLocalIp4AddressFromNetworkInterface() throws SocketException {

         List<Inet4Address> addresses = new ArrayList<>( 1 );

         // 所有网络接口信息

         Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();

         if (ObjectUtils.isEmpty(networkInterfaces)) {

             return addresses;

         }

         while (networkInterfaces.hasMoreElements()) {

             NetworkInterface networkInterface = networkInterfaces.nextElement();

             //滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头

             if (!isValidInterface(networkInterface)) {

                 continue ;

             }

             // 所有网络接口的IP地址信息

             Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();

             while (inetAddresses.hasMoreElements()) {

                 InetAddress inetAddress = inetAddresses.nextElement();

                 // 判断是否是IPv4,并且内网地址并过滤回环地址.

                 if (isValidAddress(inetAddress)) {

                     addresses.add((Inet4Address) inetAddress);

                 }

             }

         }

         return addresses;

     }

     /**

      * 过滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头

      *

      * @param ni 网卡

      * @return 如果满足要求则true,否则false

      */

     private static boolean isValidInterface(NetworkInterface ni) throws SocketException {

         return !ni.isLoopback() && !ni.isPointToPoint() && ni.isUp() && !ni.isVirtual()

                 && (ni.getName().startsWith( "eth" ) || ni.getName().startsWith( "ens" ));

     }

     /**

      * 判断是否是IPv4,并且内网地址并过滤回环地址.

      */

     private static boolean isValidAddress(InetAddress address) {

         return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress();

     }

     /*

      * 通过Socket 唯一确定一个IP

      * 当有多个网卡的时候,使用这种方式一般都可以得到想要的IP。甚至不要求外网地址8.8.8.8是可连通的

      * @return Inet4Address>

      */

     private static Optional<Inet4Address> getIpBySocket() throws SocketException {

         try ( final DatagramSocket socket = new DatagramSocket()) {

             socket.connect(InetAddress.getByName( "8.8.8.8" ), 10002 );

             if (socket.getLocalAddress() instanceof Inet4Address) {

                 return Optional.of((Inet4Address) socket.getLocalAddress());

             }

         } catch (UnknownHostException networkInterfaces) {

             throw new RuntimeException(networkInterfaces);

         }

         return Optional.empty();

     }

     /*

      * 获取本地IPv4地址

      * @return Inet4Address>

      */

     public static Optional<Inet4Address> getLocalIp4Address() throws SocketException {

         final List<Inet4Address> inet4Addresses = getLocalIp4AddressFromNetworkInterface();

         if (inet4Addresses.size() != 1 ) {

             final Optional<Inet4Address> ipBySocketOpt = getIpBySocket();

             if (ipBySocketOpt.isPresent()) {

                 return ipBySocketOpt;

             } else {

                 return inet4Addresses.isEmpty() ? Optional.empty() : Optional.of(inet4Addresses.get( 0 ));

             }

         }

         return Optional.of(inet4Addresses.get( 0 ));

     }

}

参考:

https://HdhCmsTestjianshu测试数据/p/f619663f0f0a

https://HdhCmsTestcnblogs测试数据/starcrm/p/7071227.html

下面在分享一段Java获取本机IP地址的示例代码

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

import java.net.*;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.List;

import java.util.Objects;

import java.util.Optional;

/**

  * 获取本机IP 地址

  */

public class IpUtil {

     /*

      * 获取本机所有网卡信息   得到所有IP信息

      * @return Inet4Address>

      */

     public static List<Inet4Address> getLocalIp4AddressFromNetworkInterface() throws SocketException {

         List<Inet4Address> addresses = new ArrayList<>( 1 );

         // 所有网络接口信息

         Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();

         if (Objects.isNull(networkInterfaces)) {

             return addresses;

         }

         while (networkInterfaces.hasMoreElements()) {

             NetworkInterface networkInterface = networkInterfaces.nextElement();

             //滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头

             if (!isValidInterface(networkInterface)) {

                 continue ;

             }

             // 所有网络接口的IP地址信息

             Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();

             while (inetAddresses.hasMoreElements()) {

                 InetAddress inetAddress = inetAddresses.nextElement();

                 // 判断是否是IPv4,并且内网地址并过滤回环地址.

                 if (isValidAddress(inetAddress)) {

                     addresses.add((Inet4Address) inetAddress);

                 }

             }

         }

         return addresses;

     }

     /**

      * 过滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头

      *

      * @param ni 网卡

      * @return 如果满足要求则true,否则false

      */

     private static boolean isValidInterface(NetworkInterface ni) throws SocketException {

         return !ni.isLoopback() && !ni.isPointToPoint() && ni.isUp() && !ni.isVirtual()

                 && (ni.getName().startsWith( "eth" ) || ni.getName().startsWith( "ens" ));

     }

     /**

      * 判断是否是IPv4,并且内网地址并过滤回环地址.

      */

     private static boolean isValidAddress(InetAddress address) {

         return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress();

     }

     /*

      * 通过Socket 唯一确定一个IP

      * 当有多个网卡的时候,使用这种方式一般都可以得到想要的IP。甚至不要求外网地址8.8.8.8是可连通的

      * @return Inet4Address>

      */

     private static Optional<Inet4Address> getIpBySocket() throws SocketException {

         try ( final DatagramSocket socket = new DatagramSocket()) {

             socket.connect(InetAddress.getByName( "8.8.8.8" ), 10002 );

             if (socket.getLocalAddress() instanceof Inet4Address) {

                 return Optional.of((Inet4Address) socket.getLocalAddress());

             }

         } catch (UnknownHostException networkInterfaces) {

             throw new RuntimeException(networkInterfaces);

         }

         return Optional.empty();

     }

     /*

      * 获取本地IPv4地址

      * @return Inet4Address>

      */

     public static Optional<Inet4Address> getLocalIp4Address() throws SocketException {

         final List<Inet4Address> inet4Addresses = getLocalIp4AddressFromNetworkInterface();

         if (inet4Addresses.size() != 1 ) {

             final Optional<Inet4Address> ipBySocketOpt = getIpBySocket();

             if (ipBySocketOpt.isPresent()) {

                 return ipBySocketOpt;

             } else {

                 return inet4Addresses.isEmpty() ? Optional.empty() : Optional.of(inet4Addresses.get( 0 ));

             }

         }

         return Optional.of(inet4Addresses.get( 0 ));

     }

}

到此这篇关于Java 获取本机IP地址的文章就介绍到这了,更多相关Java 获取本机IP地址内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!

原文链接:https://blog.csdn.net/qq_38020915/article/details/116293733

查看更多关于Java 获取本机IP地址的实例代码的详细内容...

  阅读:18次