在網絡編程中,出於節約帶寬或者編碼的需要,通常需要以原生方式處理long和int,而不是轉換為string。
public class ByteOrderUtils {public static byte[] int2byte(int res) { byte[] targets = new byte[4]; targets[3] = (byte) (res & 0xff);// 最低位targets[2] = (byte) ((res >> 8) & 0xff);// 次低位targets[1] = (byte) ((res >> 16) & 0xff);// 次高位targets[0] = (byte) (res >>> 24);// 最高位,無符號右移。 return targets; }public static int byteArrayToInt(byte[] b){ byte[] a = new byte[4]; int i = a.length - 1,j = b.length - 1; for (; i >= 0 ; i--,j--) {//從b的尾部(即int值的低位)開始copy數據if(j >= 0) a[i] = b[j]; else a[i] = 0;//如果b.length不足4,則將高位補0 } int v0 = (a[0] & 0xff) << 24;//&0xff將byte值無差異轉成int,避免Java自動類型提升後,會保留高位的符號位int v1 = (a[1] & 0xff) << 16; int v2 = (a[2] & 0xff) << 8; int v3 = (a[3] & 0xff) ; return v0 + v1 + v2 + v3; }public static byte[] long2byte(long res) { byte[] buffer = new byte[8]; for (int i = 0; i < 8; i++) { int offset = 64 - (i + 1) * 8; buffer[i] = (byte) ((res >> offset) & 0xff); }return buffer;}public static long byteArrayToLong(byte[] b){ long values = 0; for (int i = 0; i < 8; i++) { values <<= 8; values|= (b[i] & 0xff); } return values; }}以上就是小編為大家帶來的java int轉byte和long轉byte的方法全部內容了,希望大家多多支持武林網~