如何使用BufferedWriter写入标准输出

您的方法确实有效，只是忘记刷新输出：

try {      BufferedWriter log = new BufferedWriter(new OutputStreamWriter(System.out));  log.write("This will be printed on stdout!n");  log.flush();}catch (Exception e) {  e.printStackTrace();}

两者

OutputStreamWriter

PrintWriter

Writer

BufferedWriter log;Writer openForFile(String fileName) {  if (fileName != null)    return new PrintWriter(fileName);  else    return new OutputStreamWriter(System.out);}log = new BufferedWriter(openForFile(null)); //stdoutlog = new BufferedWriter(openForFile("mylog.log")); // using a file

或任何东西，只是为了给您这个主意。