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com.xiaoleilu.hutool.util.NetUtil Maven / Gradle / Ivy
package com.xiaoleilu.hutool.util;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.net.SocketException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import com.xiaoleilu.hutool.exceptions.UtilException;
import com.xiaoleilu.hutool.lang.Validator;
/**
* 网络相关工具
*
* @author xiaoleilu
*
*/
public final class NetUtil {
public final static String LOCAL_IP = "127.0.0.1";
private NetUtil() {
}
/**
* 根据long值获取ip v4地址
*
* @param longIP IP的long表示形式
* @return IP V4 地址
*/
public static String longToIpv4(long longIP) {
final StringBuilder sb = new StringBuilder();
// 直接右移24位
sb.append(String.valueOf(longIP >>> 24));
sb.append(".");
// 将高8位置0，然后右移16位
sb.append(String.valueOf((longIP & 0x00FFFFFF) >>> 16));
sb.append(".");
sb.append(String.valueOf((longIP & 0x0000FFFF) >>> 8));
sb.append(".");
sb.append(String.valueOf(longIP & 0x000000FF));
return sb.toString();
}
/**
* 根据ip地址计算出long型的数据
*
* @param strIP IP V4 地址
* @return long值
*/
public static long ipv4ToLong(String strIP) {
if (Validator.isIpv4(strIP)) {
long[] ip = new long[4];
// 先找到IP地址字符串中.的位置
int position1 = strIP.indexOf(".");
int position2 = strIP.indexOf(".", position1 + 1);
int position3 = strIP.indexOf(".", position2 + 1);
// 将每个.之间的字符串转换成整型
ip[0] = Long.parseLong(strIP.substring(0, position1));
ip[1] = Long.parseLong(strIP.substring(position1 + 1, position2));
ip[2] = Long.parseLong(strIP.substring(position2 + 1, position3));
ip[3] = Long.parseLong(strIP.substring(position3 + 1));
return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
}
return 0;
}
/**
* 检测本地端口可用性
*
* @param port 被检测的端口
* @return 是否可用
*/
public static boolean isUsableLocalPort(int port) {
if (false == isValidPort(port)) {
// 给定的IP未在指定端口范围中
return false;
}
try {
new Socket(LOCAL_IP, port).close();
// socket链接正常，说明这个端口正在使用
return false;
} catch (Exception e) {
return true;
}
}
/**
* 是否为有效的端口
*
* @param port 端口号
* @return 是否有效
*/
public static boolean isValidPort(int port) {
// 有效端口是0～65535
return port >= 0 && port <= 0xFFFF;
}
/**
* 判定是否为内网IPnull
* @since 3.0.1
*/
public static Collection getNetworkInterfaces() {
Enumeration networkInterfaces = null;
try {
networkInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
return null;
}
return CollectionUtil.addAll(new ArrayList(), networkInterfaces);
}
/**
* 获得本机的IP地址列表 localIpv4s() {
Enumeration networkInterfaces = null;
try {
networkInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
throw new UtilException(e.getMessage(), e);
}
if (networkInterfaces == null) {
throw new UtilException("Get network interface error!");
}
final LinkedHashSet ipSet = new LinkedHashSet<>();
while (networkInterfaces.hasMoreElements()) {
final NetworkInterface networkInterface = networkInterfaces.nextElement();
final Enumeration inetAddresses = networkInterface.getInetAddresses();
while (inetAddresses.hasMoreElements()) {
final InetAddress inetAddress = inetAddresses.nextElement();
if (inetAddress != null && inetAddress instanceof Inet4Address) {
ipSet.add(inetAddress.getHostAddress());
}
}
}
return ipSet;
}
/**
* 获取本机网卡IP地址，这个地址为所有网卡中非回路地址的第一个nullnull
* @since 3.0.7
*/
public static String getLocalhostStr() {
InetAddress localhost = getLocalhost();
if (null != localhost) {
return localhost.getHostAddress();
}
return null;
}
/**
* 获取本机网卡IP地址，这个地址为所有网卡中非回路地址的第一个nullnull
* @since 3.0.1
*/
public static InetAddress getLocalhost() {
InetAddress candidateAddress = null;
NetworkInterface iface;
InetAddress inetAddr;
try {
for (Enumeration ifaces = NetworkInterface.getNetworkInterfaces(); ifaces.hasMoreElements();) {
iface = ifaces.nextElement();
for (Enumeration inetAddrs = iface.getInetAddresses(); inetAddrs.hasMoreElements();) {
inetAddr = inetAddrs.nextElement();
if (false == inetAddr.isLoopbackAddress()) {
if (inetAddr.isSiteLocalAddress()) {
return inetAddr;
} else if (null == candidateAddress) {
// 非site-local地址做为候选地址返回
candidateAddress = inetAddr;
}
}
}
}
} catch (SocketException e) {
// ignore socket exception, and return null;
}
if (null == candidateAddress) {
try {
candidateAddress = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
// ignore
}
}
return candidateAddress;
}
/**
* 获得本机MAC地址
* @return 本机MAC地址
*/
public static String getLocalMacAddress() {
return getMacAddress(getLocalhost());
}
/**
* 获得指定地址信息中的MAC地址，使用分隔符“-”
* @param inetAddress {@link InetAddress}
* @return MAC地址，用-分隔
*/
public static String getMacAddress(InetAddress inetAddress) {
return getMacAddress(inetAddress, "-");
}
/**
* 获得指定地址信息中的MAC地址
* @param inetAddress {@link InetAddress}
* @param separator 分隔符，推荐使用“-”或者“:”
* @return MAC地址，用-分隔
*/
public static String getMacAddress(InetAddress inetAddress, String separator) {
if (null == inetAddress) {
return null;
}
byte[] mac;
try {
mac = NetworkInterface.getByInetAddress(inetAddress).getHardwareAddress();
} catch (SocketException e) {
throw new UtilException(e);
}
if(null != mac){
final StringBuilder sb = new StringBuilder();
String s;
for (int i = 0; i < mac.length; i++) {
if (i != 0) {
sb.append(separator);
}
// 字节转换为整数
s = Integer.toHexString(mac[i] & 0xFF);
sb.append(s.length() == 1 ? 0 + s : s);
}
return sb.toString();
}
return null;
}
// ----------------------------------------------------------------------------------------- Private method start
/**
* 指定IP的long是否在指定范围内
*
* @param userIp 用户IP
* @param begin 开始IP
* @param end 结束IP
* @return 是否在范围内
*/
private static boolean isInner(long userIp, long begin, long end) {
return (userIp >= begin) && (userIp <= end);
}
// ----------------------------------------------------------------------------------------- Private method end
}
