java网络字节序转换2

/**?
* 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 ;?
?? Float F = new? Float( 0.0 );?
?? i = ((((b[0 ]& 0xff )<< 8? | (b[ 1 ]& 0xff ))<< 8 ) | (b[ 2 ]& 0xff ))<< 8? | (b[ 3 ]& 0xff );?
?? return? F.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 ;?
?? Float F = new? Float( 0.0 );?
?? i = ((((b[3 ]& 0xff )<< 8? | (b[ 2 ]& 0xff ))<< 8 ) | (b[ 1 ]& 0xff ))<< 8? | (b[ 0 ]& 0xff );?
?? return? F.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 + " " );?
?? }?
?? 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 + " " ;?
?? }??
??
}??
??
/**?
?? * 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;?
}??
??
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