javacv的demo

package com.linghushaoxia.javacv11; import java.nio.ByteBuffer; /**@功能说明： * @author:linghushaoxia * @time:2015年11月27日上午9:43:03 * @version:1.0 * */ public class ByteUtil { private static ByteBuffer buffer = ByteBuffer.allocate(8); public static void main(String[] args) { //测试 int 转 byte int int0 = 234; byte byte0 = intToByte(int0); System.out.println("byte0=" + byte0);//byte0=-22 //测试 byte 转 int int int1 = byteToInt(byte0); System.out.println("int1=" + int1);//int1=234 //测试 int 转 byte 数组 int int2 = 1417; byte[] bytesInt = intToByteArray(int2); System.out.println("bytesInt=" + bytesInt);//bytesInt=[B@de6ced //测试 byte 数组转 int int int3 = byteArrayToInt(bytesInt); System.out.println("int3=" + int3);//int3=1417 //测试 long 转 byte 数组 long long1 = 2223; byte[] bytesLong = longToBytes(long1); System.out.println("bytes=" + bytesLong);//bytes=[B@c17164 //测试 byte 数组 转 long long long2 = bytesToLong(bytesLong); System.out.println("long2=" + long2);//long2=2223 } //byte 与 int 的相互转换 public static byte intToByte(int x) { return (byte) x; } public static int byteToInt(byte b) { //Java 总是把 byte 当做有符处理；我们可以通过将其和 0xFF 进行二进制与得到它的无符值 return b & 0xFF; } //byte 数组与 int 的相互转换 public static int byteArrayToInt(byte[] b) { return b[3] & 0xFF | (b[2] & 0xFF) << 8 | (b[1] & 0xFF) << 16 | (b[0] & 0xFF) << 24; } public static byte[] intToByteArray(int a) { return new byte[] { (byte) ((a >> 24) & 0xFF), (byte) ((a >> 16) & 0xFF), (byte) ((a >> 8) & 0xFF), (byte) (a & 0xFF) }; } //byte 数组与 long 的相互转换 public static byte[] longToBytes(long x) { buffer.putLong(0, x); return buffer.array(); } public static long bytesToLong(byte[] bytes) { buffer.put(bytes, 0, bytes.length); buffer.flip();//need flip return buffer.getLong(); } }