Java:我如何从PrintStream中读取？

Question

我试图从以下代码块中的PrintStram读取(将传入的数据附加到本地String):

    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将为其out(PrintStream)写一些字符串,那么我怎么能从这个PrintStream中读取,假设我无法更改Controller类中的任何代码？提前致谢.

Answer 1

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

您已经有了ByteArrayOutputStream.最容易做的是:

// ...

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

// ...

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

// use in to read the data