新增多个工具类模块，包括：Md5Tool、HexTool 等；

doc/XXL-TOOL官方文档.md

@@ -428,6 +428,9 @@ logger.info(text);
 - 3、【完善】工具类单测完善；
 - 4、【升级】升级依赖版本，如slf4j、poi、spring、gson…等。
 
+### 3.7 v1.3.2 Release Notes[迭代中]
+- 1、【新增】新增多个工具类模块，包括：Md5Tool、HexTool 等；
+
 
 ### TODO LIST
 - excel模块：大数据导出，流式导入导出；

src/main/java/com/xxl/tool/encrypt/HexTool.java

@@ -0,0 +1,135 @@
+package com.xxl.tool.encrypt;
+
+import java.nio.charset.StandardCharsets;
+
+/**
+ * hex tool
+ *
+ * @author xuxueli 2024-12-15
+ */
+public final class HexTool {
+
+    // ---------------------- constants ----------------------
+
+    /**
+     * Table for HEX to DEC byte translation.
+     */
+    private static final int[] DEC = { 00, 01, 02, 03, 04, 05, 06, 07, 8, 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13,
+            14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, 10, 11, 12, 13, 14, 15, };
+
+
+    /**
+     * Table for DEC to HEX byte translation.
+     */
+    private static final byte[] HEX =
+            { (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7',
+                    (byte) '8', (byte) '9', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f' };
+
+
+    /**
+     * Table for byte to hex string translation.
+     */
+    private static final char[] hex = "0123456789abcdef".toCharArray();
+
+
+    // ---------------------- Static Methods ----------------------
+
+    public static int getDec(int index) {
+        // Fast for correct values, slower for incorrect ones
+        try {
+            return DEC[index - '0'];
+        } catch (ArrayIndexOutOfBoundsException ex) {
+            return -1;
+        }
+    }
+
+
+    public static byte getHex(int index) {
+        return HEX[index];
+    }
+
+
+    public static String toHexString(char c) {
+        // 2 bytes / 4 hex digits
+        StringBuilder sb = new StringBuilder(4);
+
+        sb.append(hex[(c & 0xf000) >> 12]);
+        sb.append(hex[(c & 0x0f00) >> 8]);
+
+        sb.append(hex[(c & 0xf0) >> 4]);
+        sb.append(hex[(c & 0x0f)]);
+
+        return sb.toString();
+    }
+
+
+    // ---------------------- tool ----------------------
+
+    /**
+     * byte to hex
+     *
+     * @param input
+     * @return
+     */
+    public static String toHex(String input) {
+        return byteToHex(input.getBytes(StandardCharsets.UTF_8));
+    }
+    /**
+     * byte to hex
+     *
+     * @param bytes
+     * @return
+     */
+    public static String byteToHex(byte[] bytes) {
+        if (null == bytes) {
+            return null;
+        }
+
+        StringBuilder sb = new StringBuilder(bytes.length << 1);
+        for (byte aByte : bytes) {
+            sb.append(hex[(aByte & 0xf0) >> 4]).append(hex[(aByte & 0x0f)]);
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * hex to byte
+     *
+     * @param input
+     * @return
+     */
+    public static String fromHex(String input) {
+        return new String(hexToByte(input), StandardCharsets.UTF_8);
+    }
+
+    /**
+     * hex to byte
+     *
+     * @param input
+     * @return
+     */
+    public static byte[] hexToByte(String input) {
+        if (input == null) {
+            return null;
+        }
+
+        if ((input.length() & 1) == 1) {
+            throw new IllegalArgumentException("Odd number of characters");
+        }
+
+        char[] inputChars = input.toCharArray();
+        byte[] result = new byte[input.length() >> 1];
+        for (int i = 0; i < result.length; i++) {
+            int upperNibble = getDec(inputChars[2 * i]);
+            int lowerNibble = getDec(inputChars[2 * i + 1]);
+            if (upperNibble < 0 || lowerNibble < 0) {
+                throw new IllegalArgumentException("None hex character");
+            }
+            result[i] = (byte) ((upperNibble << 4) + lowerNibble);
+        }
+        return result;
+    }
+
+}

src/main/java/com/xxl/tool/encrypt/Md5Tool.java

@@ -0,0 +1,53 @@
+package com.xxl.tool.encrypt;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+
+/**
+ * md5 tool
+ *
+ * @author xuxueli 2024-12-15
+ */
+public abstract class Md5Tool {
+
+	private static final String MD5_ALGORITHM_NAME = "MD5";
+
+	private static final char[] HEX_CHARS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+	/**
+	 * calculate md5 for input
+	 *
+	 * @param input
+	 * @return
+	 */
+	public static String md5(String input) {
+		return md5(input.getBytes(StandardCharsets.UTF_8));
+	}
+
+	/**
+	 * calculate md5 for input
+	 *
+	 * @param input 输入字节数组
+	 * @return MD5摘要的十六进制字符串
+	 */
+	public static String md5(byte[] input) {
+		try {
+			MessageDigest md = MessageDigest.getInstance(MD5_ALGORITHM_NAME);
+			byte[] digest = md.digest(input);
+			return HexTool.byteToHex(digest);
+		} catch (Exception e) {
+			throw new IllegalStateException("Md5Tool#md5 error, input:"+ input, e);
+		}
+	}
+
+	/*private static String bytesToHex(byte[] bytes) {
+		char[] hexChars = new char[bytes.length * 2];
+		for (int i = 0; i < bytes.length; i++) {
+			int v = bytes[i] & 0xFF;
+			hexChars[i * 2] = HEX_CHARS[v >>> 4];
+			hexChars[i * 2 + 1] = HEX_CHARS[v & 0x0F];
+		}
+		return new String(hexChars);
+	}*/
+
+}

src/test/java/com/xxl/tool/test/encrypt/HexToolTest.java

@@ -0,0 +1,24 @@
+package com.xxl.tool.test.encrypt;
+
+import com.xxl.tool.encrypt.HexTool;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class HexToolTest {
+    private static Logger logger = LoggerFactory.getLogger(HexToolTest.class);
+
+    @Test
+    public void test(){
+        String input = "xxl-tool";
+        String output = HexTool.toHex(input);
+        logger.info("input: {}, output: {}", input, output);
+
+        String input2 = HexTool.fromHex(output);
+        logger.info("calculate input2: {}", input2);
+
+        Assertions.assertEquals(input, input2);
+    }
+
+}

src/test/java/com/xxl/tool/test/encrypt/Md5ToolTest.java

@@ -0,0 +1,19 @@
+package com.xxl.tool.test.encrypt;
+
+import com.xxl.tool.encrypt.Md5Tool;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class Md5ToolTest {
+    private static Logger logger = LoggerFactory.getLogger(Md5ToolTest.class);
+
+    @Test
+    public void test(){
+        String input = "test";
+
+        String output = Md5Tool.md5(input);
+        logger.info("input:{}, md5:{}", input, output);
+    }
+
+}