JAVA开发中字节转换问题（byte数组byte数组、合并、转换16进制）

1.合并多个byte数组内容

2.byte数组转换为16进制

3.byte转换16进制

4.byte数组倒序排列

5.int整数转换为4字节的byte数组

/** * @Title: sysCopy * @Description: 合并多个byte[]内容 * @param srcArrays * @return * @return byte[] 返回类型 * @throws */private static byte[] sysCopy(List<byte[]> srcArrays) {int len = 0;for (byte[] srcArray : srcArrays) {len += srcArray.length;}byte[] destArray = new byte[len];int destLen = 0;for (byte[] srcArray : srcArrays) {System.arraycopy(srcArray, 0, destArray, destLen, srcArray.length);destLen += srcArray.length;}return destArray;}/** * @Title: bytes2HexString * @Description: byte[]转换16进制 * @param b * @return * @return String 返回类型 * @throws */private static String bytes2HexString(byte[] b) {String ret = "";for (int i = 0; i < b.length; i++) {String hex = Integer.toHexString(b[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}ret += hex.toUpperCase();}return ret;}/** * @Title: byte2HexString * @Description: byte转换16进制 * @param b * @return * @return String 返回类型 * @throws */private static String byte2HexString(byte b) {String ret = "";String hex = Integer.toHexString(b & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}ret += hex.toUpperCase();return ret;}/** * @Title: getReverse * @Description: byte[]倒序排列 * @param t * @return * @return byte[] 返回类型 * @throws */private static byte[] getReverse(byte[] t) {for (int start = 0, end = t.length - 1; start < end; start++, end--) {byte temp = t[end];t[end] = t[start];t[start] = temp;}return t;}/** * @Title: intToByte4 * @Description: int整数转换为4字节的byte数组 * @param i * @return * @return byte[] 返回类型 * @throws */private 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;}