相当方便实用的一个工具类，原始链接已不可知，改正了一些小错误
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/** * 通信格式转换 * * Java和一些windows编程语言如c、c++、delphi所写的网络程序进行通讯时，需要进行相应的转换 * 高、低字节之间的转换 * windows的字节序为低字节开头 * linux,unix的字节序为高字节开头 * java则无论平台变化，都是高字节开头 */ public class FormatTransfer { /** * 将int转为低字节在前，高字节在后的byte数组 * @param n int * @return byte[] */ public static byte[] toLH( int n) { byte[] b = new byte[4]; b[0] = ( byte) (n & 0xff); b[1] = ( byte) (n >> 8 & 0xff); b[2] = ( byte) (n >> 16 & 0xff); b[3] = ( byte) (n >> 24 & 0xff); return b; } /** * 将int转为高字节在前，低字节在后的byte数组 * @param n int * @return byte[] */ public static byte[] toHH( int n) { byte[] b = new byte[4]; b[3] = ( byte) (n & 0xff); b[2] = ( byte) (n >> 8 & 0xff); b[1] = ( byte) (n >> 16 & 0xff); b[0] = ( byte) (n >> 24 & 0xff); return b; } /** * 将short转为低字节在前，高字节在后的byte数组 * @param n short * @return byte[] */ public static byte[] toLH( short n) { byte[] b = new byte[2]; b[0] = ( byte) (n & 0xff); b[1] = ( byte) (n >> 8 & 0xff); return b; } /** * 将short转为高字节在前，低字节在后的byte数组 * @param n short * @return byte[] */ public static byte[] toHH( short n) { byte[] b = new byte[2]; b[1] = ( byte) (n & 0xff); b[0] = ( byte) (n >> 8 & 0xff); return b; } /** * 将将int转为高字节在前，低字节在后的byte数组 public static byte[] toHH(int number) { int temp = number; byte[] b = new byte[4]; for (int i = b.length - 1; i > -1; i--) { b = new Integer(temp & 0xff).byteValue(); temp = temp >> 8; } return b; } public static byte[] IntToByteArray(int i) { byte[] abyte0 = new byte[4]; abyte0[3] = (byte) (0xff & i); abyte0[2] = (byte) ((0xff00 & i) >> 8); abyte0[1] = (byte) ((0xff0000 & i) >> 16); abyte0[0] = (byte) ((0xff000000 & i) >> 24); return abyte0; } */ /** * 将float转为低字节在前，高字节在后的byte数组 */ public static byte[] toLH( float f) { return toLH(Float.floatToRawIntBits(f)); } /** * 将float转为高字节在前，低字节在后的byte数组 */ public static byte[] toHH( float f) { return toHH(Float.floatToRawIntBits(f)); } /** * 将String转为byte数组 */ public static byte[] stringToBytes(String s, int length) { while (s.getBytes().length < length) { s += " "; } return s.getBytes(); } /** * 将字节数组转换为String * @param b byte[] * @return String */ public static String bytesToString( byte[] b) { StringBuffer result = new StringBuffer(""); int length = b.length; for ( int i=0; i<length; i++) { result.append(( char)(b[i] & 0xff)); } return result.toString(); } /** * 将字符串转换为byte数组 * @param s String * @return byte[] */ public static byte[] stringToBytes(String s) { return s.getBytes(); } /** * 将高字节数组转换为int * @param b byte[] * @return int */ public static int hBytesToInt( byte[] b) { int s = 0; for ( int i = 0; i < 3; i++) { if (b[i] >= 0) { s = s + b[i]; } else { s = s + 256 + b[i]; } s = s * 256; } if (b[3] >= 0) { s = s + b[3]; } else { s = s + 256 + b[3]; } return s; } /** * 将低字节数组转换为int * @param b byte[] * @return int */ public static int lBytesToInt( byte[] b) { int s = 0; for ( int i = 0; i < 3; i++) { if (b[3-i] >= 0) { s = s + b[3-i]; } else { s = s + 256 + b[3-i]; } s = s * 256; } if (b[0] >= 0) { s = s + b[0]; } else { s = s + 256 + b[0]; } return s; } /** * 高字节数组到short的转换 * @param b byte[] * @return short */ public static short hBytesToShort( byte[] b) { int s = 0; if (b[0] >= 0) { s = s + b[0]; } else { s = s + 256 + b[0]; } s = s * 256; if (b[1] >= 0) { s = s + b[1]; } else { s = s + 256 + b[1]; } short result = ( short)s; return result; } /** * 低字节数组到short的转换 * @param b byte[] * @return short */ public static short lBytesToShort( byte[] b) { int s = 0; if (b[1] >= 0) { s = s + b[1]; } else { s = s + 256 + b[1]; } s = s * 256; if (b[0] >= 0) { s = s + b[0]; } else { s = s + 256 + b[0]; } short result = ( short)s; return result; } /** * 高字节数组转换为float * @param b byte[] * @return float */ public static float hBytesToFloat( byte[] b) { int i = 0; i = ((((b[0]&0xff)<<8 | (b[1]&0xff))<<8) | (b[2]&0xff))<<8 | (b[3]&0xff); return Float.intBitsToFloat(i); } /** * 低字节数组转换为float * @param b byte[] * @return float */ public static float lBytesToFloat( byte[] b) { int i = 0; i = ((((b[3]&0xff)<<8 | (b[2]&0xff))<<8) | (b[1]&0xff))<<8 | (b[0]&0xff); return Float.intBitsToFloat(i); } /** * 将byte数组中的元素倒序排列 */ public static byte[] bytesReverseOrder( byte[] b) { int length = b.length; byte[] result = new byte[length]; for( int i=0; i<length; i++) { result[length-i-1] = b[i]; } return result; } /** * 打印byte数组 */ public static void printBytes( byte[] bb) { int length = bb.length; for ( int i=0; i<length; i++) { System.out.print(bb[i] + " "); } System.out.println(""); } public static void logBytes( byte[] bb) { int length = bb.length; String out = ""; for ( int i=0; i<length; i++) { out = out + bb[i] + " "; } } /** * 将int类型的值转换为字节序颠倒过来对应的int值 * @param i int * @return int */ public static int reverseInt( int i) { int result = FormatTransfer.hBytesToInt(FormatTransfer.toLH(i)); return result; } /** * 将short类型的值转换为字节序颠倒过来对应的short值 * @param s short * @return short */ public static short reverseShort( short s) { short result = FormatTransfer.hBytesToShort(FormatTransfer.toLH(s)); return result; } /** * 将float类型的值转换为字节序颠倒过来对应的float值 * @param f float * @return float */ public static float reverseFloat( float f) { float result = FormatTransfer.hBytesToFloat(FormatTransfer.toLH(f)); return result; } }
转载于:https://www.cnblogs.com/cuizhf/archive/2012/01/13/2321172.html
