Android---16进制与字节数组
16进制字符串与字节数组进行转换
package string; import java.util.Arrays; /** * byte[]与16进制字符串相互转换 * * @date:2017年4月10日 下午11:04:27 */ public class BytesHexStrTranslate { private static final char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; /** * 方法一: * byte[] to hex string * * @param bytes * @return */ public static String bytesToHexFun1(byte[] bytes) { // 一个byte为8位,可用两个十六进制位标识 char[] buf = new char[bytes.length * 2]; int a = 0; int index = 0; for(byte b : bytes) { // 使用除与取余进行转换 if(b < 0) { a = 256 + b; } else { a = b; } buf[index++] = HEX_CHAR[a / 16]; buf[index++] = HEX_CHAR[a % 16]; } return new String(buf); } /** * 方法二: * byte[] to hex string * * @param bytes * @return */ public static String bytesToHexFun2(byte[] bytes) { char[] buf = new char[bytes.length * 2]; int index = 0; for(byte b : bytes) { // 利用位运算进行转换,可以看作方法一的变种 buf[index++] = HEX_CHAR[b >>> 4 & 0xf]; buf[index++] = HEX_CHAR[b & 0xf]; } return new String(buf); } /** * 方法三: * byte[] to hex string * * @param bytes * @return */ public static String bytesToHexFun3(byte[] bytes) { StringBuilder buf = new StringBuilder(bytes.length * 2); for(byte b : bytes) { // 使用String的format方法进行转换 buf.append(String.format("%02x", new Integer(b & 0xff))); } return buf.toString(); } /** * 将16进制字符串转换为byte[] * * @param str * @return */ public static byte[] toBytes(String str) { if(str == null || str.trim().equals("")) { return new byte[0]; } byte[] bytes = new byte[str.length() / 2]; for(int i = 0; i < str.length() / 2; i++) { String subStr = str.substring(i * 2, i * 2 + 2); bytes[i] = (byte) Integer.parseInt(subStr, 16); } return bytes; } public static void main(String[] args) throws Exception { byte[] bytes = "测试".getBytes("utf-8"); System.out.println("字节数组为:" + Arrays.toString(bytes)); System.out.println("方法一:" + bytesToHexFun1(bytes)); System.out.println("方法二:" + bytesToHexFun2(bytes)); System.out.println("方法三:" + bytesToHexFun3(bytes)); System.out.println("=================================="); String str = "e6b58be8af95"; System.out.println("转换后的字节数组:" + Arrays.toString(toBytes(str))); System.out.println(new String(toBytes(str), "utf-8")); } }