Java：我如何从PrintStream中读取？

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问题描述

我正在尝试从以下代码块中的PrintStram读取（将传入数据附加到本地String中）：

I am trying to read(append incoming data into a local String) from a PrintStram in the following code block:

    System.out.println("Starting Login Test Cases...");

    out = new PrintStream(new ByteArrayOutputStream());
            command_feeder = new PipedWriter();
            PipedReader in = new PipedReader(command_feeder);

    main_controller = new Controller(in, out);

    for(int i = 0; i < cases.length; i++)
    {
                command_feeder.write(cases[i]);
    }

main_controller会将一些字符串写入其中（PrintStream），那怎么能我从这个PrintStream中读取，假设我无法更改Controller类中的任何代码？在此先感谢。

main_controller will be writing some strings to its out(PrintStream), then how can I read from this PrintStream assuming I can't change any code in Controller class? Thanks in advance.

推荐答案

简单地说：你做不到。 PrintStream用于输出，要读取数据，您需要一个InputStream（或任何子类）。

Simply spoken: you can't. A PrintStream is for outputting, to read data, you need an InputStream (or any subclass).

您已经有了一个ByteArrayOutputStream。最容易做的是：

You already have a ByteArrayOutputStream. Easiest to do is:

// ...

ByteArrayOutputStream baos = new ByteArrayOutputStream();
out = new PrintStream(baos);

// ...

ByteArrayInputStream in = new ByteArrayInputStream(baos.toByteArray());

// use in to read the data

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printStream