写入控制台和文本文件

在得知OP要复制流后更新了答案

由于要在两个流中写入数据，请尝试

TeeOutputStream

try {    FileOutputStream fos = new FileOutputStream(f);    Runtime.getRuntime().addShutdownHook(new Thread(() -> {        try { fos.flush();        }        catch (Throwable t) { // Ignore        }    }, "Shutdown hook Thread flushing " + f));    //we will want to print in standard "System.out" and in "file"    TeeOutputStream myOut=new TeeOutputStream(System.out, fos);    PrintStream ps = new PrintStream(myOut, true); //true - auto-flush after println    System.setOut(ps);} catch (Exception e) {    e.printStackTrace();}

现在，来自的结果

System.out