Java中long数据类型转换字节数组

long转换为字节数组

//long转换为字节数组
long n = 909090L;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
dos.writeLong(n);

byte[] buf = baos.toByteArray();

字节数组转换为long

byte[] buf = new byte[1024];

ByteArrayInputStream bais = new ByteArrayInputStream(buf);
DataInputStream dis = new DataInputStream();

long l = dis.readLong();