java 16进制数据格式化处理工具类,16进制byte数组转String

/**
* Created by xiaoming on 2017-10-13 15:02.
*
* @mail sgyingyin@sina.com
* @desc 16进制数据处理工具类
*/
public class HexDump {
private final static char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};//十六进制的组成元素

/**
* 字节数组以String形式输出 以空格分隔,如：FE 00 12 0F 0E
*
* @param array 字节数组
* @return
*/
public static String dumpHexString(byte[] array) {
return dumpHexString(array, 0, array.length);
}

/**
* 字节数组以String形式输出 字节间以空格分隔
*
* @param array  字节数组
* @param offset 起始位置
* @param length 长度
* @return
*/
public static String dumpHexString(byte[] array, int offset, int length) {
StringBuilder result = new StringBuilder();

byte[] line = new byte[16];
int lineIndex = 0;

result.append("\n0x");
result.append(toHexString(offset));

for (int i = offset; i < offset + length; i++) {
if (lineIndex == 16) {
result.append(" ");

for (int j = 0; j < 16; j++) {
if (line[j] > ' ' && line[j] < '~') {
result.append(new String(line, j, 1));
} else {
result.append(".");
}
}

result.append("\n0x");
result.append(toHexString(i));
lineIndex = 0;
}

byte b = array[i];
result.append(" ");
result.append(HEX_DIGITS[(b >>> 4) & 0x0F]);
result.append(HEX_DIGITS[b & 0x0F]);

line[lineIndex++] = b;
}

if (lineIndex != 16) {
int count = (16 - lineIndex) * 3;
count++;
for (int i = 0; i < count; i++) {
result.append(" ");
}

for (int i = 0; i < lineIndex; i++) {
if (line[i] > ' ' && line[i] < '~') {
result.append(new String(line, i, 1));
} else {
result.append(".");
}
}
}

return result.toString();
}

/**
* 字节转16进制String
*
* @param b 字节
* @return
*/
public static String toHexString(byte b) {
return toHexString(toByteArray(b));
}

/**
* 字节数组转16进制String，无分隔，如：FE00120F0E
*
* @param array 字节数组
* @return
*/
public static String toHexString(byte[] array) {
return toHexString(array, 0, array.length);
}

/**
* 字节数组转16进制String，无分隔，如：FE00120F0E
*
* @param array  字节数组
* @param offset 起始
* @param length 长度
* @return
*/
public static String toHexString(byte[] array, int offset, int length) {
char[] buf = new char[length * 2];

int bufIndex = 0;
for (int i = offset; i < offset + length; i++) {
byte b = array[i];
buf[bufIndex++] = HEX_DIGITS[(b >>> 4) & 0x0F];
buf[bufIndex++] = HEX_DIGITS[b & 0x0F];
}

return new String(buf);
}

/**
* int转16进制String
*
* @param i
* @return
*/
public static String toHexString(int i) {
return toHexString(toByteArray(i));
}

/**
* 字节转数组
*
* @param b
* @return
*/
public static byte[] toByteArray(byte b) {
byte[] array = new byte[1];
array[0] = b;
return array;
}

/**
* int转字节数组
*
* @param i
* @return
*/
public static byte[] toByteArray(int i) {
byte[] array = new byte[4];

array[3] = (byte) (i & 0xFF);
array[2] = (byte) ((i >> 8) & 0xFF);
array[1] = (byte) ((i >> 16) & 0xFF);
array[0] = (byte) ((i >> 24) & 0xFF);

return array;
}

/**
* 十六进制转int
*
* @param c
* @return
*/
private static int toByte(char c) {
if (c >= '0' && c <= '9') return (c - '0');
if (c >= 'A' && c <= 'F') return (c - 'A' + 10);
if (c >= 'a' && c <= 'f') return (c - 'a' + 10);

throw new RuntimeException("Invalid hex char '" + c + "'");
}

/**
* 十六进制字符串转字节数组
*
* @param hexString 如：FE00120F0E
* @return
*/
public static byte[] hexStringToByteArray(String hexString) {
int length = hexString.length();
byte[] buffer = new byte[length / 2];

for (int i = 0; i < length; i += 2) {
buffer[i / 2] = (byte) ((toByte(hexString.charAt(i)) << 4) | toByte(hexString.charAt(i + 1)));
}

return buffer;
}
}