常见数字类型long, int, short和byte数组的转换

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/** * 常见数字类型和byte数组的互相转换 * @author ERic * */public class BytesHelper {public static byte[] longToByte(long number) {long temp = number;byte[] b = new byte[8];for (int i = 0; i < b.length; i++) {b[i] = new Long(temp & 0xff).byteValue();temp = temp >> 8;}return b;}public static long byteToLong(byte[] b) {long s = 0;//最低位long s0 = b[0] & 0xff;long s1 = b[1] & 0xff;long s2 = b[2] & 0xff;long s3 = b[3] & 0xff;long s4 = b[4] & 0xff;long s5 = b[5] & 0xff;long s6 = b[6] & 0xff;long s7 = b[7] & 0xff;s1 <<= 8;s2 <<= 16;s3 <<= 24;s4 <<= 8 * 4;s5 <<= 8 * 5;s6 <<= 8 * 6;s7 <<= 8 * 7;s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7;return s;}public static byte[] intToByte(int number) {int temp = number;byte[] b = new byte[4];for (int i = 0; i < b.length; i++) {b[i] = new Integer(temp & 0xff).byteValue();temp = temp >> 8;}return b;}public static int byteToInt(byte[] b) {int s = 0;int s0 = b[0] & 0xff;int s1 = b[1] & 0xff;int s2 = b[2] & 0xff;int s3 = b[3] & 0xff;s3 <<= 24;s2 <<= 16;s1 <<= 8;s = s0 | s1 | s2 | s3;return s;}public static byte[] shortToByte(short number) {int temp = number;byte[] b = new byte[2];for (int i = 0; i < b.length; i++) {b[i] = new Integer(temp & 0xff).byteValue();temp = temp >> 8;}return b;}public static short byteToShort(byte[] b) {short s = 0;short s0 = (short) (b[0] & 0xff);// 最低位short s1 = (short) (b[1] & 0xff);s1 <<= 8;s = (short) (s0 | s1);return s;}}