update 电单车协议

jsowell-common/src/main/java/com/jsowell/common/util/BytesUtil.java

@@ -272,6 +272,55 @@ public class BytesUtil {
 		return stringBuilder.toString();
 	}
 
+	/**
+	 * 将字符串转换为指定长度的16进制字节数组。
+	 *
+	 * @param str 需要转换的字符串
+	 * @param targetLength 目标字节数组的长度
+	 * @return 对应的16进制字节数组
+	 */
+	public static byte[] stringToHexBytes(String str, int targetLength) {
+		if (str == null) {
+			throw new IllegalArgumentException("字符串不能为null");
+		}
+
+		int strLength = str.length();
+		if (targetLength < strLength) {
+			throw new IllegalArgumentException("目标字节数组长度必须大于等于字符串长度");
+		}
+
+		byte[] hexBytes = new byte[targetLength];
+		for (int i = 0; i < strLength; i++) {
+			char c = str.charAt(i);
+			hexBytes[i] = (byte) c;
+		}
+
+		// 剩余部分用0填充
+		for (int i = strLength; i < targetLength; i++) {
+			hexBytes[i] = 0;
+		}
+
+		return hexBytes;
+	}
+
+	/**
+	 * 将字节数组转换为十六进制字符串，用于打印查看。
+	 *
+	 * @param bytes 字节数组
+	 * @return 十六进制字符串
+	 */
+	private static String bytesToHex(byte[] bytes) {
+		StringBuilder hexString = new StringBuilder();
+		for (byte b : bytes) {
+			String hex = Integer.toHexString(0xFF & b);
+			if (hex.length() == 1) {
+				hexString.append('0');
+			}
+			hexString.append(hex);
+		}
+		return hexString.toString();
+	}
+
 	/**
 	 * @函数功能: 10进制串转为BCD码
 	 * @输入参数: 10进制串
@@ -326,12 +375,14 @@ public class BytesUtil {
 		return revert(temp);
 	}
 
-
-
 	public static void main(String[] args) {
-		byte[] length = new byte[] {0x09, 0x00};
-		int i = BytesUtil.bytesToIntLittle(length);
-		System.out.println(i);
+		// byte[] length = new byte[] {0x09, 0x00};
+		// int i = BytesUtil.bytesToIntLittle(length);
+		// System.out.println(i);
+
+		String testStr = "DNY";
+		byte[] hexBytes = stringToHexBytes(testStr, 3);
+		System.out.println("Hex Bytes: " + bytesToHex(hexBytes));
 	}
 
 	/**