move Text hex to Encoder/Decoder

src/main/java/com/imyeyu/utils/Decoder.java

@@ -4,6 +4,7 @@ import com.imyeyu.java.bean.timi.TimiCode;
 import com.imyeyu.java.bean.timi.TimiException;
 
 import java.io.StringWriter;
+import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
 import java.util.Base64;
@@ -102,4 +103,42 @@ public class Decoder {
 		}
 		return URLDecoder.decode(url, StandardCharsets.UTF_8);
 	}
+
+	/**
+	 * 16 进制字符串转字节数据
+	 *
+	 * @param hex 16 进制字符串
+	 * @return 字节数据
+	 * @throws UnsupportedEncodingException 不支持的编码
+	 */
+	public static byte[] hex(String hex) throws UnsupportedEncodingException {
+		final char[] c = hex.toCharArray();
+		final byte[] b = new byte[c.length >> 1];
+
+		final int len = c.length;
+		if ((len & 0x01) != 0) {
+			throw new UnsupportedEncodingException("Odd number of characters.");
+		}
+
+		final int outLen = len >> 1;
+		if (c.length < outLen) {
+			throw new UnsupportedEncodingException("Output array is not large enough to accommodate decoded data.");
+		}
+		for (int i = 0, j = 0; j < len; i++) {
+			int f = toDigit(c[j], j) << 4;
+			j++;
+			f = f | toDigit(c[j], j);
+			j++;
+			b[i] = (byte) (f & 0xFF);
+		}
+		return b;
+	}
+
+	private static int toDigit(final char ch, final int index) throws UnsupportedEncodingException {
+		final int digit = Character.digit(ch, 16);
+		if (digit == -1) {
+			throw new UnsupportedEncodingException("Illegal hexadecimal character " + ch + " at index " + index);
+		}
+		return digit;
+	}
 }