update

src/main/java/com/its/app/utils/SysUtils.java

@@ -1,6 +1,7 @@
 package com.its.app.utils;
 
-import java.text.ParseException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
@@ -195,4 +196,30 @@ public final class SysUtils
 
 		return sb.toString();
 	}
+
+	public static int bytesToInt(byte[] bytes) {
+		return ByteBuffer.wrap(bytes).getInt();
+	}
+	public static int bytesToInt(byte[] bytes, int fromIdx, ByteOrder byteOrder) {
+
+		if (byteOrder == ByteOrder.BIG_ENDIAN) {
+			return (
+					((bytes[fromIdx+0] & 0xFF) << 24) |
+							((bytes[fromIdx+1] & 0xFF) << 16) |
+							((bytes[fromIdx+2] & 0xFF) << 8 ) |
+							((bytes[fromIdx+3] & 0xFF) << 0 )
+			);
+		}
+		return (
+				((bytes[fromIdx+3] & 0xFF) << 24) |
+						((bytes[fromIdx+2] & 0xFF) << 16) |
+						((bytes[fromIdx+1] & 0xFF) << 8 ) |
+						((bytes[fromIdx+0] & 0xFF) << 0 )
+		);
+	}
+
+	public static byte[] intToBytes(int value) {
+		// BIG_ENDIAN
+		return  ByteBuffer.allocate(4).putInt(value).array();
+	}
 }