问题写入0xFF到文件 [英] Problem writing 0xFF to file

问题描述

我正在尝试使用PrintStream在java中写入0xFF文件。当我用Hex编辑器打开它时，其他值正确写入文件，但是假设显示0xFF的值改为0xC3BF。

I'm trying to write a 0xFF to file in java using PrintStream. Other values are written to the file correctly when I open it with a Hex editor but the value that is suppose to show 0xFF got 0xC3BF instead.

使用的变量类型是int 。经过几次尝试后，我还发现我可以放入的最大值是0x7F，这将在十六进制编辑器中正确显示，如果我输入0x80，那么十六进制编辑器将显示0xC280。

The variable type used is int. After a few tried I also discover that the "maximum" value i can put is 0x7F this will be displayed correctly in the Hex editor, if i put 0x80 then the hex editor will display 0xC280.

出了什么问题？

推荐答案

稍微调查显示输出的值是UTF-8编码的（以下行）是Python）：

A little investigation shows that the outputted values are UTF-8 encoded (the following lines are Python):

In [1]: "\xc2\x80".decode("utf-8")
Out[1]: u'\x80'

In [2]: "\xc3\xbf".decode("utf-8")
Out[2]: u'\xff'

确保为<$ c选择正确的重载$ c> print / println / 写以便将整数值写为字节而不是字符或字符串。请参阅所有人的 PrintStream文档超载。

Make sure you choose the correct overload for print/println/write in order to write the integer value as a byte instead of as character or string. See the documentation of PrintStream for all overloads.

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