jiemit/src/main/java/com/yc/education/util/MachineIp.java

package com.yc.education.util;

import java.io.IOException;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.List;

public class MachineIp {
	 /**
     * 获取本机Ip
     *
     *  通过 获取系统所有的networkInterface网络接口 然后遍历 每个网络下的InterfaceAddress组。
     *  获得符合 <code>InetAddress instanceof Inet4Address</code> 条件的一个IpV4地址
     * @return
     */
    @SuppressWarnings("rawtypes")
	public static String localIp() {
        String ip = null;
        Enumeration allNetInterfaces;
        try {
            allNetInterfaces = NetworkInterface.getNetworkInterfaces();
            while (allNetInterfaces.hasMoreElements()) {
                NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
                List<InterfaceAddress> InterfaceAddress = netInterface.getInterfaceAddresses();
                for (InterfaceAddress add : InterfaceAddress) {
                    InetAddress Ip = add.getAddress();
                    if (Ip != null && Ip instanceof Inet4Address) {
                        ip = Ip.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
            //logger.warn("获取本机Ip失败:异常信息:"+e.getMessage());
        }
        return ip;
    }

    public static void main(String[] args) throws IOException {
    	/*System.err.println(localIp());*/
        SM4 sm4 = new SM4( );
        String decode = sm4.decode("pVUnxpFL39NMFFupXDwBdA==", "W5#");
        System.out.println(decode );
    }

}