- public class DataTypeChangeHelper {
- /**
- * 将一个单字节的byte转换成32位的int
- *
- * @param b
- * byte
- * @return convert result
- */
- public static int unsignedByteToInt(byte b) {
- return (int) b & 0xFF;
- }
- /**
- * 将一个单字节的Byte转换成十六进制的数
- *
- * @param b
- * byte
- * @return convert result
- */
- public static String byteToHex(byte b) {
- int i = b & 0xFF;
- return Integer.toHexString(i);
- }
- /**
- * 将一个4byte的数组转换成32位的int
- *
- * @param buf
- * bytes buffer
- * @param byte[]中开始转换的位置
- * @return convert result
- */
- public static long unsigned4BytesToInt(byte[] buf, int pos) {
- int firstByte = 0;
- int secondByte = 0;
- int thirdByte = 0;
- int fourthByte = 0;
- int index = pos;
- firstByte = (0x000000FF & ((int) buf[index]));
- secondByte = (0x000000FF & ((int) buf[index + 1]));
- thirdByte = (0x000000FF & ((int) buf[index + 2]));
- fourthByte = (0x000000FF & ((int) buf[index + 3]));
- index = index + 4;
- return ((long) (firstByte << 24 | secondByte << 16 | thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL;
- }
- /**
- * 将16位的short转换成byte数组
- *
- * @param s
- * short
- * @return byte[] 长度为2
- * */
- public static byte[] shortToByteArray(short s) {
- byte[] targets = new byte[2];
- for (int i = 0; i < 2; i++) {
- int offset = (targets.length - 1 - i) * 8;
- targets = (byte) ((s >>> offset) & 0xff);
- }
- return targets;
- }
- /**
- * 将32位整数转换成长度为4的byte数组
- *
- * @param s
- * int
- * @return byte[]
- * */
- public static byte[] intToByteArray(int s) {
- byte[] targets = new byte[2];
- for (int i = 0; i < 4; i++) {
- int offset = (targets.length - 1 - i) * 8;
- targets = (byte) ((s >>> offset) & 0xff);
- }
- return targets;
- }
- /**
- * long to byte[]
- *
- * @param s
- * long
- * @return byte[]
- * */
- public static byte[] longToByteArray(long s) {
- byte[] targets = new byte[2];
- for (int i = 0; i < 8; i++) {
- int offset = (targets.length - 1 - i) * 8;
- targets = (byte) ((s >>> offset) & 0xff);
- }
- return targets;
- }
- /**32位int转byte[]*/
- public static byte[] int2byte(int res) {
- byte[] targets = new byte[4];
- targets[0] = (byte) (res & 0xff);// 最低位
- targets[1] = (byte) ((res >> 8) & 0xff);// 次低位
- targets[2] = (byte) ((res >> 16) & 0xff);// 次高位
- targets[3] = (byte) (res >>> 24);// 最高位,无符号右移。
- return targets;
- }
- /**
- * 将长度为2的byte数组转换为16位int
- *
- * @param res
- * byte[]
- * @return int
- * */
- public static int byte2int(byte[] res) {
- // res = InversionByte(res);
- // 一个byte数据左移24位变成0x??000000,再右移8位变成0x00??0000
- int targets = (res[0] & 0xff) | ((res[1] << 8) & 0xff00); // | 表示安位或
- return targets;
- }
- }
时间: 2024-11-07 08:48:00