BitConverter.java:位处理字节数组处理工具类

2017-12-15· 886 次浏览
字节处理工具类,可以从byte\[\]数组中读取Int16,Int32,Int64,以及int或long与byte\[\]数组的相互转换。 ``` package com.itshidu.util; /**  * 位处理,字节处理  * @author Master.Xia Date:2017年12月15日  */ public class BitConverter {           public static short ToInt16(byte[] bytes, int offset) {         short result = (short) ((int)bytes[offset]&0xff);         result &##124;= ((int)bytes[offset+1]&0xff) << 8;         return (short) (result & 0xffff);     }     public static int ToUInt16(byte[] bytes, int offset) {         int result = (int)bytes[offset+1]&0xff;         result &##124;= ((int)bytes[offset]&0xff) << 8;         return result & 0xffff;     }     public static int ToInt32(byte[] bytes, int offset) {         int result = (int)bytes[offset]&0xff;         result &##124;= ((int)bytes[offset+1]&0xff) << 8;         result &##124;= ((int)bytes[offset+2]&0xff) << 16;         result &##124;= ((int)bytes[offset+3]&0xff) << 24;         return result;     }     public static long ToUInt32(byte[] bytes, int offset) {         long result = (int)bytes[offset]&0xff;         result &##124;= ((int)bytes[offset+1]&0xff) << 8;         result &##124;= ((int)bytes[offset+2]&0xff) << 16;         result &##124;= ((int)bytes[offset+3]&0xff) << 24;         return result & 0xFFFFFFFFL;     }     public static long ToInt64(byte[] buffer,int offset) {         long values = 0;         for (int i = 0; i < 8; i++) {             values <<= 8; values &##124;= (buffer[offset+i] & 0xFF);         }         return values;     }     public static long ToUInt64(byte[] bytes, int offset) {         long result = 0;         for (int i = 0; i <= 56; i += 8) {             result &##124;= ((int)bytes[offset++]&0xff) << i;         }         return result;     }     public static float ToFloat(byte[] bs, int index) {                         return Float.intBitsToFloat(ToInt32(bs, index));                       }     public static double ToDouble(byte[] arr,int offset) {         return Double.longBitsToDouble(ToUInt64(arr, offset));     }     public static boolean ToBoolean(byte[] bytes,int offset) {         return (bytes[offset]==0x00)? false:true;     }       public static byte[] GetBytes(short value) {         byte[] bytes = new byte[2];         bytes[0] = (byte) (value & 0xff);         bytes[1] = (byte) ((value & 0xff00) >> 8);         return bytes;     }     public static byte[] GetBytes(int value) {         byte[] bytes = new byte[4];         bytes[0] = (byte) ((value)&0xFF); //最低位         bytes[1] = (byte) ((value >> 8)&0xFF);         bytes[2] = (byte) ((value >> 16)&0xFF);         bytes[3] = (byte) ((value >>> 24)); //最高位,无符号右移         return bytes;     }     public static byte[] GetBytes(long values) {         byte[] buffer = new byte[8];         for (int i = 0; i < 8; i++) {             int offset = 64 - (i + 1) * 8;             buffer[i] = (byte)((values >> offset) & 0xff);         }         return buffer;     }     public static byte[] GetBytes(float value) {         return GetBytes(Float.floatToIntBits(value));     }     public static byte[] GetBytes(double val) {         long value = Double.doubleToLongBits(val);         return GetBytes(value);     }     public static byte[] GetBytes(boolean value) {         return new byte[]{(byte)(value? 1:0)};     }           public static byte IntToByte(int x) {         return (byte) x;     }     public static int ByteToInt(byte b) {         return b & 0xFF;     }     public static char ToChar(byte[] bs,int offset) {         return (char) (((bs[offset] & 0xFF) << 8) &##124; (bs[offset+1] & 0xFF));     }     public static byte[] GetBytes(char value) {         byte[] b = new byte[2];         b[0] = (byte) ((value & 0xFF00) >> 8);         b[1] = (byte) (value & 0xFF);         return b;     }       public static byte[] Concat(byte[]... bs) {         int len = 0,idx=0;         for(byte[] b:bs)len+=b.length;         byte[] buffer = new byte[len];         for(byte[] b:bs) {             System.arraycopy(b,0, buffer, idx, b.length);             idx+=b.length;         }         return buffer;     }     public static void main(String[] args) {         long a = 123456;         byte[] b1=GetBytes(a);         long b= ToInt64(b1, 0);         System.out.println(b);     } } ```