下面是int 类型跟byte[] 类型的相互转换
//int 类型转 字节数组（bytes）
public static byte[] intToBytes(int id){
byte[] bytes = new byte[4];
for (int j = 0; j < bytes.length; j++) {
bytes[j] = (byte)((int)(id >> j*8)& 0xff);
}
return bytes;
}
//字节数组转int 类型
public static int bytesToInt(byte[] bytes){
int result = 0 ;
for (int i = 0; i < bytes.length; i++) {
result = result + (int)((bytes[i] & 0xff) << i*8);
}
return result;
}
public static void main(String[] args) {
byte[] by = intToBytes(500);
System.out.print("500转字节数组后== ");
for (int i = 0; i < by.length; i++) {
System.out.print(by[i]+",");
}
System.out.println();
System.out.println("by字节数组转int型后== " + bytesToInt(by));
}
输出结果：
500转字节数组后== -12,1,0,0,
by字节数组转int型后== 500
如果是转其他数据类型的话 只要把强制转换为int 改为强制转换你需要转换的基本数据类型即可，如：转long类型
//字节数组转long 类型
public static long bytesToInt(byte[] bytes){
long result = 0 ;
for (int i = 0; i < bytes.length; i++) {
result = result + (long )((bytes[i] & 0xff) << i*8);
}
return result;
}