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int类型的数据—>byte类型数组转换
//byte数组"按高位在前，低位在后"的方式存放int类型数据
int src = 123;
int[] dec = new int[4];
dec[0] = (src /256/256/256);
dec[1] = (src /256/256);
dec[2] = (src /256);
dec[3] = (src %256);//byte数组按"低位在前，高位在后"的方式存放int类型数据
int src = 123;
int[] dec = new int[4];
dec[0] = (src %256);
dec[1] = (src /256);
dec[2] = (src /256/256);
dec[3] = (src /256/256/256);