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appmain/utils/system/SystemUtils.java

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+package com.proxgrind.chameleon.utils.system;
+
+/**
+ * @author DXL
+ */
+public class SystemUtils {
+
+    /**
+     * 判断当前是否超时
+     *
+     * @param startTimeStamp 开始时间（时间戳形式）
+     * @param timeoutms      超时值，当最新的时间超过了这个值时将会被判断为超时!
+     * @return true 超时，
+     */
+    public static boolean isTimeout(long startTimeStamp, long timeoutms) {
+        return System.currentTimeMillis() - startTimeStamp >= timeoutms;
+    }
+
+    // 简化休眠
+    public static void sleep(long ms) {
+        try {
+            Thread.sleep(ms);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Calculates the checksum of the passed byte buffer.
+     *
+     * @param buffer
+     * @return byte checksum value
+     */
+    public static byte calcChecksum(byte[] buffer, boolean sub) {
+        if (buffer == null) return 0;
+        byte checksum = 0;
+        int bufPos = 0;
+        int byteCount = buffer.length;
+        while (byteCount-- != 0) {
+            byte b = buffer[bufPos++];
+            if (!sub)
+                checksum += b;
+            else
+                checksum -= b;
+        }
+        return checksum;
+    }
+
+    /**
+     * Calculates the checksum of the passed byte buffer.
+     *
+     * @param buffer
+     * @return byte checksum value
+     */
+    public static byte calcChecksub(byte checkSum, byte[] buffer, boolean sub) {
+        if (buffer == null) return 0;
+        byte checksum = checkSum;
+        int bufPos = 0;
+        int byteCount = buffer.length;
+        while (byteCount-- != 0) {
+            byte b = buffer[bufPos++];
+            if (!sub)
+                checksum += b;
+            else
+                checksum -= b;
+            //System.out.println("value: " + HexUtil.toHexString(tmp) + "," + HexUtil.toHexString(b) + " checksum: " + HexUtil.toHexString(checksum));
+        }
+        return checksum;
+    }
+}