third commit by ailanyin

ailanyin-common/src/main/java/com/ailanyin/common/utils/Base64Util.java

@@ -0,0 +1,27 @@
+package com.ailanyin.common.utils;
+
+import sun.misc.BASE64Decoder;
+import sun.misc.BASE64Encoder;
+
+/**
+ * @author ailanyin
+ * @version 1.0
+ * @since 2022/3/2 0002 下午 15:31
+ */
+public class Base64Util {
+
+    /**
+     * BASE64解密
+     * @throws Exception
+     */
+    public static byte[] decrypt(String key) throws Exception {
+        return (new BASE64Decoder()).decodeBuffer(key);
+    }
+
+    /**
+     * BASE64加密
+     */
+    public static String encrypt(byte[] key) throws Exception {
+        return (new BASE64Encoder()).encodeBuffer(key);
+    }
+}

ailanyin-common/src/main/java/com/ailanyin/common/utils/DateUtil.java

@@ -331,13 +331,22 @@ public class DateUtil extends org.apache.commons.lang3.time.DateUtils {
         return getDayEndTime(cal.getTime());
     }
 
-    public static int test() {
-        Calendar instance = Calendar.getInstance();
-        instance.set(Calendar.DAY_OF_MONTH,4);
-        return instance.get(Calendar.WEEK_OF_MONTH);
+    /**
+     * 得到几天前的时间
+     * @param d
+     * @param day
+     * @return
+     */
+    public static Date getDateBefore(Date d,int day){
+        Calendar now =Calendar.getInstance();
+        now.setTime(d);
+        now.set(Calendar.DATE,now.get(Calendar.DATE)-day);
+        return now.getTime();
     }
+
     public static void main(String[] args) {
-        System.out.println(test());
+        Date date = getDateBefore(new Date(), 3);
+        System.out.println(date);
     }
 }
 

ailanyin-common/src/main/java/com/ailanyin/common/utils/IpUtil.java

@@ -5,7 +5,10 @@ import com.alibaba.fastjson.JSONObject;
 
 import javax.servlet.http.HttpServletRequest;
 import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
 import java.net.UnknownHostException;
+import java.util.Enumeration;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -109,4 +112,76 @@ public class IpUtil {
         Matcher matcher = pattern.matcher(ipStr);
         return matcher.matches();
     }
+
+    /**
+     * 获取本地IP地址
+     *
+     * @throws SocketException
+     */
+    public static String getLocalIp() throws UnknownHostException {
+        try {
+            if (isWindowsOS()) {
+                return InetAddress.getLocalHost().getHostAddress();
+            } else {
+                return getLinuxLocalIp();
+            }
+        } catch (SocketException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    /**
+     * 判断操作系统是否是Windows
+     *
+     * @return
+     */
+    public static boolean isWindowsOS() {
+        boolean isWindowsOS = false;
+        String osName = System.getProperty("os.name");
+        if (osName.toLowerCase().indexOf("windows") > -1) {
+            isWindowsOS = true;
+        }
+        return isWindowsOS;
+    }
+
+    /**
+     * 获取本地Host名称
+     */
+    public static String getLocalHostName() throws UnknownHostException {
+        return InetAddress.getLocalHost().getHostName();
+    }
+
+    /**
+     * 获取Linux下的IP地址
+     *
+     * @return IP地址
+     * @throws SocketException
+     */
+    private static String getLinuxLocalIp() throws SocketException {
+        String ip = "";
+        try {
+            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
+                NetworkInterface intf = en.nextElement();
+                String name = intf.getName();
+                if (!name.contains("docker") && !name.contains("lo")) {
+                    for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
+                        InetAddress inetAddress = enumIpAddr.nextElement();
+                        if (!inetAddress.isLoopbackAddress()) {
+                            String ipaddress = inetAddress.getHostAddress().toString();
+                            if (!ipaddress.contains("::") && !ipaddress.contains("0:0:") && !ipaddress.contains("fe80")) {
+                                ip = ipaddress;
+                            }
+                        }
+                    }
+                }
+            }
+        } catch (SocketException ex) {
+            System.out.println("获取ip地址异常");
+            ip = "127.0.0.1";
+            ex.printStackTrace();
+        }
+        return ip;
+    }
 }