java byte数组与int,long,short,byte的转换实现方法
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2024-03-13 10:27:09
实例如下:
public class datatypechangehelper {
/**
* 将一个单字节的byte转换成32位的int...
实例如下:
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[i] = (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[i] = (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[i] = (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; } }
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