java基本类型与byte数组互相转换.doc

public class ConvToByte /* * short类型转换成byte数组 * * param param * 待转的short * return * * author li * date 2014-1-16 上午10:03:47 */public static byte shortToByteArr(short param) byte arr = new byte2;arr0 = (byte) (param 8) & 0xff);arr1 = (byte) (param & 0xff);return arr;/* * int类型转换成byte数组 * * param param * 待转的int * return * * author li * date 2014-1-16 上午10:03:47 */public static byte intToByteArr(int param) byte arr = new byte4;arr0 = (byte) (param 24) & 0xff);arr1 = (byte) (param 16) & 0xff);arr2 = (byte) (param 8) & 0xff);arr3 = (byte) (param & 0xff);return arr;/* * long类型转换成byte数组 * * param param * 待转的long * return * * author li * date 2014-1-16 上午10:03:47 */public static byte longToByteArr(long param) byte arr = new byte8;arr0 = (byte) (param 56) & 0xff);arr1 = (byte) (param 48) & 0xff);arr2 = (byte) (param 40) & 0xff);arr3 = (byte) (param 32) & 0xff);arr4 = (byte) (param 24) & 0xff);arr5 = (byte) (param 16) & 0xff);arr6 = (byte) (param 8) & 0xff);arr7 = (byte) (param & 0xff);return arr;/* * 字符到字节转换 * * param ch * 字符 * return * * author li * date 2014-1-16 下午4:10:07 */public static byte charToByteArr(char ch) byte b = new byte2;int temp = (int) ch;b0 = (byte) (temp 8 & 0xff);b1 = (byte) (temp & 0xff);return b;/* * double转换byte数组 * * param param * double * return byte数组 * * author li * date 2014-1-16 下午4:45:57 */public static byte doubleToByteArr(double param) byte b = new byte8;long l = Double.doubleToLongBits(param);for (int i = 0; i 8;return b;/* * float转换byte数组 * * param param * float * return byte数组 * * author li * date 2014-1-16 下午5:05:04 */public static byte floatToByteArr(float param) byte b = new byte4;int l = Float.floatToIntBits(param);for (int i = 0; i 8;return b;/* * 将2字节的byte数组转成short值 * * param b * byte数组 * return * * author li * date 2014-1-16 下午3:00:01 */public static short byteArrToShort(byte b) byte a = new byte2;int i = a.length - 1, j = b.length - 1;for (; i = 0; i-, j-) / 从b的尾部(即int值的低位)开始copy数据if (j = 0)ai = bj;else/ 如果b.length不足2,则将高位补0ai = 0;/ &0xff将byte值无差异转成int,避免Java自动类型提升后,会保留高位的符号位int v0 = (a0 & 0xff) = 0; i-, j-) / 从b的尾部(即int值的低位)开始copy数据if (j = 0)ai = bj;else/ 如果b.length不足4,则将高位补0ai = 0;/ &0xff将byte值无差异转成int,避免Java自动类型提升后,会保留高位的符号位int v0 = (a0 & 0xff) 24;int v1 = (a1 & 0xff) 16;int v2 = (a2 & 0xff) = 0; i-, j-) / 从b的尾部(即int值的低位)开始copy数据if (j = 0)ai = bj;else/ 如果b.length不足4,则将高位补0ai = 0;/ &0xff将byte值无差异转成int,避免Java自动类型提升后,会保留高位的符号位int v0 = (a0 & 0xff) 56;int v1 = (a1 & 0xff) 48;int v2 = (a2 & 0xff) 40;int v3 = (a3 & 0xff) 32;int v4 = (a4 & 0xff) 24;int v5 = (a5 & 0xff) 16;int v6 = (a6 & 0xff) = 0; i-, j-) / 从b的尾部(即int值的低位)开始copy数据if (j = 0)ai = bj;else/ 如果b.length不足2,则将高位补0ai = 0;/ &0xff将byte值无差异转成int,避免Java自动类型提升后,会保留高位的符号位int v0 = (a0 & 0xff) 8;int v1 = (a1 & 0xff);return (char) (v0 + v1);/* * byte数组到double转换 * * param byte数组 * return double * * author li * date 2014-1-16 下午5:25:14 */public static double byteArrToDouble(byte b) long l;l = b0;l &= 0xff;l |= (long) b1 8);l &= 0xffff;l |= (long) b2 16);l &= 0xffffff;l |= (long) b3 24);l &= 0xffffffffl;l |= (long) b4 32);l &= 0xffffffffffl;l |= (long) b5 40);l &= 0xffffffffffffl;l |= (long) b6 48);l &= 0xffffffffffffffl;l |= (long) b7 56);return Double.longBitsToDouble(l);/* * byte数组到float转换 * * param byte数组 * return float * * author li * date 2014-1-16 下午5:25:14 */publi