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jsowell-common/src/main/java/com/jsowell/common/util/Cp56Time2a/Cp56Time2aUtil.java

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+package com.jsowell.common.util.Cp56Time2a;
+
+import java.io.ByteArrayOutputStream;
+import java.util.Calendar;
+import java.util.Date;
+
+/**
+ * TODO
+ *
+ * @author JS-ZZA
+ * @date 2023/2/28 16:50
+ */
+public class Cp56Time2aUtil {
+
+    /**
+     * int 转换成 byte数组
+     */
+    public static byte[] intToByteArray(int i) {
+        byte[] result = new byte[4];
+        result[0] = (byte) ((i >> 24) & 0xFF);
+        result[1] = (byte) ((i >> 16) & 0xFF);
+        result[2] = (byte) ((i >> 8) & 0xFF);
+        result[3] = (byte) (i & 0xFF);
+        return result;
+    }
+
+    /**
+     * 日期转换成 CP56Time2a
+     *
+     * @param date Date类型日期
+     * @return {@link Byte}
+     */
+    public static byte[] date2Hbyte(Date date) {
+        ByteArrayOutputStream bOutput = new ByteArrayOutputStream();
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(date);
+        // 毫秒需要转换成两个字节其中 低位在前高位在后
+        // 先转换成short
+        int millisecond = calendar.get(Calendar.SECOND) * 1000 + calendar.get(Calendar.MILLISECOND);
+
+        // 默认的高位在前
+        byte[] millisecondByte = intToByteArray(millisecond);
+        bOutput.write(millisecondByte[3]);
+        bOutput.write(millisecondByte[2]);
+
+        // 分钟 只占6个比特位 需要把前两位置为零
+        bOutput.write((byte) calendar.get(Calendar.MINUTE));
+        // 小时需要把前三位置零
+        bOutput.write((byte) calendar.get(Calendar.HOUR_OF_DAY));
+        // 星期日的时候 week 是0
+        int week = 0;
+        // if (week == Calendar.SUNDAY) {
+        //     week = 7;
+        // } else {
+        //     week--;
+        // }
+        // 前三个字节是 星期 因此需要将星期向左移5位  后五个字节是日期  需要将两个数字相加 相加之前需要先将前三位置零
+        bOutput.write((byte) (week << 5) + (calendar.get(Calendar.DAY_OF_MONTH)));
+        // 前四字节置零
+        bOutput.write((byte) ((byte) calendar.get(Calendar.MONTH) + 1));
+        bOutput.write((byte) (calendar.get(Calendar.YEAR) - 2000));
+        return bOutput.toByteArray();
+    }
+
+    /**
+     * CP56Time2a转换成  时间
+     *
+     * @param dataByte 数据报文
+     */
+    public static Date byte2Hdate(byte[] dataByte) {
+        int year = (dataByte[6] & 0x7F) + 2000;
+        int month = dataByte[5] & 0x0F;
+        int day = dataByte[4] & 0x1F;
+        int hour = dataByte[3] & 0x1F;
+        int minute = dataByte[2] & 0x3F;
+        int second = dataByte[1] > 0 ? dataByte[1] : (dataByte[1] & 0xff);
+        int millisecond = dataByte[0] > 0 ? dataByte[0] : (dataByte[0] & 0xff);
+        millisecond = (second << 8) + millisecond;
+        second = millisecond / 1000;
+        millisecond = millisecond % 1000;
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(Calendar.YEAR, year);
+        calendar.set(Calendar.MONTH, month);
+        calendar.set(Calendar.DAY_OF_MONTH, day);
+        calendar.set(Calendar.HOUR_OF_DAY, hour);
+        calendar.set(Calendar.MINUTE, minute);
+        calendar.set(Calendar.SECOND, second);
+        calendar.set(Calendar.MILLISECOND, millisecond);
+        return calendar.getTime();
+    }
+}