java整數與byte數組的轉換實現代碼

這里對java中整數與byte數組的轉換進行了實現，平時的項目中很少用的到，但是特定需求的時候還是需要的，這里就記錄下，親測可用，

實現代碼：

public class NumberUtil {

/**

* int整數轉換為4字節的byte數組

*

* @param i

* 整數

* @return byte數組

*/

public static byte[] intToByte4(int i) {

byte[] targets = new byte[4];

targets[3] = (byte) (i & 0xFF);

targets[2] = (byte) (i >> 8 & 0xFF);

targets[1] = (byte) (i >> 16 & 0xFF);

targets[0] = (byte) (i >> 24 & 0xFF);

return targets;

}

/**

* long整數轉換為8字節的byte數組

*

* @param lo

* long整數

* @return byte數組

*/

public static byte[] longToByte8(long lo) {

byte[] targets = new byte[8];

for (int i = 0; i < 8; i++) {

int offset = (targets.length - 1 - i) * 8;

targets[i] = (byte) ((lo >>> offset) & 0xFF);

}

return targets;

}

/**

* short整數轉換為2字節的byte數組

*

* @param s

* short整數

* @return byte數組

*/

public static byte[] unsignedShortToByte2(int s) {

byte[] targets = new byte[2];

targets[0] = (byte) (s >> 8 & 0xFF);

targets[1] = (byte) (s & 0xFF);

return targets;

}

/**

* byte數組轉換為無符號short整數

*

* @param bytes

* byte數組

* @return short整數

*/

public static int byte2ToUnsignedShort(byte[] bytes) {

return byte2ToUnsignedShort(bytes, 0);

}

/**

* byte數組轉換為無符號short整數

*

* @param bytes

* byte數組

* @param off

* 開始位置

* @return short整數

*/

public static int byte2ToUnsignedShort(byte[] bytes, int off) {

int high = bytes[off];

int low = bytes[off + 1];

return (high << 8 & 0xFF00) | (low & 0xFF);

}

/**

* byte數組轉換為int整數

*

* @param bytes

* byte數組

* @param off

* 開始位置

* @return int整數

*/

public static int byte4ToInt(byte[] bytes, int off) {

int b0 = bytes[off] & 0xFF;

int b1 = bytes[off + 1] & 0xFF;

int b2 = bytes[off + 2] & 0xFF;

int b3 = bytes[off + 3] & 0xFF;

return (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;

}

}

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