ObjectOutputStream编写额外的字符 [英] ObjectOutputStream writing extra characters

问题描述

我知道在编写文本时应该使用作家而不是输出流，但是我仍然不明白为什么在运行该程序后文件outputStream.txt中会有多余的字符:

I know that writers should be used instead of outputstreams when writing text, but still I don't understand why there are extra characters in the file outputStream.txt after running this program:

public static void main(String[] args) throws FileNotFoundException, IOException
    {
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("C:\\Data\\tmp\\outputStream.txt")));
        oos.writeObject("SomeObject");
        oos.writeUTF("SomeUTF");
        oos.flush();
        oos.close();
        BufferedWriter writer = new BufferedWriter(new FileWriter(new File("C:\\Data\\tmp\\outputWriter.txt")));
        writer.write("SomeObject");
        writer.write("SomeUTF");
        writer.flush();
        writer.close();
    }

文件outputWriter.txt为17字节，与预期的一样，但outputStream.txt为28，包括一些无法识别的文本.为什么会这样?

The file outputWriter.txt is 17bytes, as expected, but outputStream.txt is 28, including some unrecognizable text. Why is that?

推荐答案

ObjectOutputStream用于将Java对象写入流.这意味着不会将String的值写入流中.而是写成下一个对象是String并且其值是SomeObject".

ObjectOutputStream is used to write Java objects to a stream. That means won't write the value of a String into the stream; instead if will write "the next object is a String and the value for it is SomeObject".

因此，如果要使用纯文本文件，则必须使用Writer API.

So if you want a plain text file, you have to use the Writer API.

注意:您的代码取决于平台.如果要使其独立于平台，则必须使用:

Note: Your code is platform dependent. If you want to make it platform independent, then you have to use:

    FileOutputStream stream = new FileOutputStream( file );
    return new BufferedWriter( new OutputStreamWriter( stream, Charset.forName("UTF-8") ) );

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