int与字节数组互相转换

public class ByteTest {

	public static void main(String[] args) {
		byte[] result = int2ByteArray(12556);
		System.err.println("result = " + result[0] + " " + result[1] + " " + result[2] + " " + result[3]);
		int intResult = byteArray2Int(result);
		System.err.println(intResult);
	}

	/**
	 * 字节数组的低位是整型的高字节位 
	 * @param target
	 * @return
	 */
	public static byte[] int2ByteArray(int target) {
		byte[] array = new byte[4];
		for (int i = 0; i < 4; i++) {
			int offSet = array.length -i -1;
			array[i] = (byte) (target >> 8 * offSet & 0xFF);
		}
		return array;
	}

	/**
	 * 字节数组的低位是整型的高字节位 
	 * @param array
	 * @return
	 */
	public static int byteArray2Int(byte[] array) {
		int result = 0;
		byte loop;

		for (int i = 0; i < 4; i++) {
			loop = array[i];
			int offSet = array.length -i -1;
			result += (loop & 0xFF) << (8 * offSet);

		}
		return result;
	}
}

运行 结果：

result = 0 0 49 12
12556