diff --git a/src/main/java/com/imyeyu/utils/Decoder.java b/src/main/java/com/imyeyu/utils/Decoder.java
index e595e40..925eff7 100644
--- a/src/main/java/com/imyeyu/utils/Decoder.java
+++ b/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;
+	}
 }
diff --git a/src/main/java/com/imyeyu/utils/Digest.java b/src/main/java/com/imyeyu/utils/Digest.java
index 8ce1aca..b522952 100644
--- a/src/main/java/com/imyeyu/utils/Digest.java
+++ b/src/main/java/com/imyeyu/utils/Digest.java
@@ -54,7 +54,7 @@ public class Digest {
 		try {
 			MessageDigest sha = MessageDigest.getInstance("SHA");
 			sha.update(bytes);
-			return Text.byteToHex(sha.digest());
+			return Encoder.hex(sha.digest());
 		} catch (NoSuchAlgorithmException e) {
 			throw new UnsupportedOperationException("unsupported sha1 digest");
 		}
@@ -72,7 +72,7 @@ public class Digest {
 		try {
 			MessageDigest sha = MessageDigest.getInstance("SHA-256");
 			sha.update(bytes);
-			return Text.byteToHex(sha.digest());
+			return Encoder.hex(sha.digest());
 		} catch (NoSuchAlgorithmException e) {
 			throw new UnsupportedOperationException("unsupported sha256 digest");
 		}
diff --git a/src/main/java/com/imyeyu/utils/Encoder.java b/src/main/java/com/imyeyu/utils/Encoder.java
index c46dd3b..6400237 100644
--- a/src/main/java/com/imyeyu/utils/Encoder.java
+++ b/src/main/java/com/imyeyu/utils/Encoder.java
@@ -159,4 +159,20 @@ public class Encoder {
 			throw new TimiException(TimiCode.ERROR, e.getMessage());
 		}
 	}
+
+	/**
+	 * 字节数据转 16 进制字符串
+	 *
+	 * @param bytes 字节数据
+	 * @return 16 进制字符串
+	 */
+	public static String hex(byte[] bytes) {
+		final int l = bytes.length;
+		final char[] c = new char[l << 1];
+		for (int i = 0, j = 0; i < l; i++) {
+			c[j++] = Text.HEX_DIGITS_LOWER[(0xF0 & bytes[i]) >>> 4];
+			c[j++] = Text.HEX_DIGITS_LOWER[0x0F & bytes[i]];
+		}
+		return new String(c);
+	}
 }
diff --git a/src/main/java/com/imyeyu/utils/Text.java b/src/main/java/com/imyeyu/utils/Text.java
index 3483250..72f03d5 100644
--- a/src/main/java/com/imyeyu/utils/Text.java
+++ b/src/main/java/com/imyeyu/utils/Text.java
@@ -2,14 +2,12 @@ package com.imyeyu.utils;
 
 import com.imyeyu.java.TimiJava;
 
-import java.io.UnsupportedEncodingException;
 import java.security.SecureRandom;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.UUID;
-import java.util.regex.Pattern;
 
 /**
  * @author 夜雨
@@ -20,63 +18,6 @@ public class Text {
 	/** 十六进制小写 */
 	public static char[] HEX_DIGITS_LOWER = "0123456789abcdef".toCharArray();
 
-	/** 十六进制大写 */
-	public static char[] HEX_DIGITS_UPPER = "0123456789ABCDEF".toCharArray();
-
-	/**
-	 * 字节数据转 16 进制字符串
-	 *
-	 * @param bytes 字节数据
-	 * @return 16 进制字符串
-	 */
-	public static String byteToHex(byte[] bytes) {
-		final int l = bytes.length;
-		final char[] c = new char[l << 1];
-		for (int i = 0, j = 0; i < l; i++) {
-			c[j++] = Text.HEX_DIGITS_LOWER[(0xF0 & bytes[i]) >>> 4];
-			c[j++] = Text.HEX_DIGITS_LOWER[0x0F & bytes[i]];
-		}
-		return new String(c);
-	}
-
-	/**
-	 * 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[] hexToByte(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;
-	}
-
 	/**
 	 * 是否为半角字符
 	 *