//把一个long型的数据转换为数组
Long num = 9809L;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);
dos.writeLong(num);
byte[] buf = bos.toByteArray();
System.out.println(buf.length);
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//把一个long型的数据转换为数组
Long num = 9809L;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);
dos.writeLong(num);
byte[] buf = bos.toByteArray();
System.out.println(buf.length);
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