這篇文章將為大家詳細講解有關利用Java在將整型數(shù)與byte[]數(shù)組進行轉(zhuǎn)換,文章內(nèi)容質(zhì)量較高,因此小編分享給大家做個參考,希望大家閱讀完這篇文章后對相關知識有一定的了解。
創(chuàng)新互聯(lián)公司IDC提供業(yè)務:服務器托管,成都服務器租用,服務器托管,重慶服務器租用等四川省內(nèi)主機托管與主機租用業(yè)務;數(shù)據(jù)中心含:雙線機房,BGP機房,電信機房,移動機房,聯(lián)通機房。具體如下:
工作項目需要在java和c/c++之間進行socket通信,socket通信是以字節(jié)流或者字節(jié)包進行的,socket發(fā)送方須將數(shù)據(jù)轉(zhuǎn)換為字節(jié)流或者字節(jié)包,而接收方則將字節(jié)流和字節(jié)包再轉(zhuǎn)換回相應的數(shù)據(jù)類型。如果發(fā)送方和接收方都是同種語言,則一般只涉及到字節(jié)序的調(diào)整。而對于java和c/c++的通信,則情況就要復雜一些,主要是因為java中沒有unsigned類型,并且java和c在某些數(shù)據(jù)類型上的長度不一致。
針對這種情況,本文整理了java數(shù)據(jù)類型和網(wǎng)絡字節(jié)流或字節(jié)包(相當于java的byte數(shù)組)之間轉(zhuǎn)換方法。實際上網(wǎng)上這方面的資料不少,但往往不全,甚至有些有錯誤,于是就花了點時間對java整型數(shù)和網(wǎng)絡字節(jié)序的byte[]之間轉(zhuǎn)換的各種情況做了一些驗證和整理。整理出來的函數(shù)如下:
public class ByteConvert { // 以下 是整型數(shù) 和 網(wǎng)絡字節(jié)序的 byte[] 數(shù)組之間的轉(zhuǎn)換 public static byte[] longToBytes(long n) { byte[] b = new byte[8]; b[7] = (byte) (n & 0xff); b[6] = (byte) (n >> 8 & 0xff); b[5] = (byte) (n >> 16 & 0xff); b[4] = (byte) (n >> 24 & 0xff); b[3] = (byte) (n >> 32 & 0xff); b[2] = (byte) (n >> 40 & 0xff); b[1] = (byte) (n >> 48 & 0xff); b[0] = (byte) (n >> 56 & 0xff); return b; } public static void longToBytes( long n, byte[] array, int offset ){ array[7+offset] = (byte) (n & 0xff); array[6+offset] = (byte) (n >> 8 & 0xff); array[5+offset] = (byte) (n >> 16 & 0xff); array[4+offset] = (byte) (n >> 24 & 0xff); array[3+offset] = (byte) (n >> 32 & 0xff); array[2+offset] = (byte) (n >> 40 & 0xff); array[1+offset] = (byte) (n >> 48 & 0xff); array[0+offset] = (byte) (n >> 56 & 0xff); } public static long bytesToLong( byte[] array ) { return ((((long) array[ 0] & 0xff) << 56) | (((long) array[ 1] & 0xff) << 48) | (((long) array[ 2] & 0xff) << 40) | (((long) array[ 3] & 0xff) << 32) | (((long) array[ 4] & 0xff) << 24) | (((long) array[ 5] & 0xff) << 16) | (((long) array[ 6] & 0xff) << 8) | (((long) array[ 7] & 0xff) << 0)); } public static long bytesToLong( byte[] array, int offset ) { return ((((long) array[offset + 0] & 0xff) << 56) | (((long) array[offset + 1] & 0xff) << 48) | (((long) array[offset + 2] & 0xff) << 40) | (((long) array[offset + 3] & 0xff) << 32) | (((long) array[offset + 4] & 0xff) << 24) | (((long) array[offset + 5] & 0xff) << 16) | (((long) array[offset + 6] & 0xff) << 8) | (((long) array[offset + 7] & 0xff) << 0)); } public static byte[] intToBytes(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; } public static void intToBytes( int n, byte[] array, int offset ){ array[3+offset] = (byte) (n & 0xff); array[2+offset] = (byte) (n >> 8 & 0xff); array[1+offset] = (byte) (n >> 16 & 0xff); array[offset] = (byte) (n >> 24 & 0xff); } public static int bytesToInt(byte b[]) { return b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16 | (b[0] & 0xff) << 24; } public static int bytesToInt(byte b[], int offset) { return b[offset+3] & 0xff | (b[offset+2] & 0xff) << 8 | (b[offset+1] & 0xff) << 16 | (b[offset] & 0xff) << 24; } public static byte[] uintToBytes( long 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; } public static void uintToBytes( long n, byte[] array, int offset ){ array[3+offset] = (byte) (n ); array[2+offset] = (byte) (n >> 8 & 0xff); array[1+offset] = (byte) (n >> 16 & 0xff); array[offset] = (byte) (n >> 24 & 0xff); } public static long bytesToUint(byte[] array) { return ((long) (array[3] & 0xff)) | ((long) (array[2] & 0xff)) << 8 | ((long) (array[1] & 0xff)) << 16 | ((long) (array[0] & 0xff)) << 24; } public static long bytesToUint(byte[] array, int offset) { return ((long) (array[offset+3] & 0xff)) | ((long) (array[offset+2] & 0xff)) << 8 | ((long) (array[offset+1] & 0xff)) << 16 | ((long) (array[offset] & 0xff)) << 24; } public static byte[] shortToBytes(short n) { byte[] b = new byte[2]; b[1] = (byte) ( n & 0xff); b[0] = (byte) ((n >> 8) & 0xff); return b; } public static void shortToBytes(short n, byte[] array, int offset ) { array[offset+1] = (byte) ( n & 0xff); array[offset] = (byte) ((n >> 8) & 0xff); } public static short bytesToShort(byte[] b){ return (short)( b[1] & 0xff |(b[0] & 0xff) << 8 ); } public static short bytesToShort(byte[] b, int offset){ return (short)( b[offset+1] & 0xff |(b[offset] & 0xff) << 8 ); } public static byte[] ushortToBytes(int n) { byte[] b = new byte[2]; b[1] = (byte) ( n & 0xff); b[0] = (byte) ((n >> 8) & 0xff); return b; } public static void ushortToBytes(int n, byte[] array, int offset ) { array[offset+1] = (byte) ( n & 0xff); array[offset] = (byte) ((n >> 8) & 0xff); } public static int bytesToUshort(byte b[]) { return b[1] & 0xff | (b[0] & 0xff) << 8; } public static int bytesToUshort(byte b[], int offset) { return b[offset+1] & 0xff | (b[offset] & 0xff) << 8; } public static byte[] ubyteToBytes( int n ){ byte[] b = new byte[1]; b[0] = (byte) (n & 0xff); return b; } public static void ubyteToBytes( int n, byte[] array, int offset ){ array[0] = (byte) (n & 0xff); } public static int bytesToUbyte( byte[] array ){ return array[0] & 0xff; } public static int bytesToUbyte( byte[] array, int offset ){ return array[offset] & 0xff; } // char 類型、 float、double 類型和 byte[] 數(shù)組之間的轉(zhuǎn)換關系還需繼續(xù)研究實現(xiàn)。 }
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