如何生成PrintWriter并将内容写入JTextArea或相等

Question

I have a Problem, I dont know how to create a PrintWriter and then write the stuff to a JTextArea .

I have a library which want a PrintWriter in a method which I want to use to get some output. But I dont know how to generate a instance of the PrintWriter and then add the information to a JTextArea.

Anybody can help me?

I need s.th. like this:

PrintWriter pw = new PrintWriter(...);
foo.print(pw);

Answer 1

PrintWriter can wrap another Writer and pass along everything written to it. You can use a StringWriter to write to a string buffer, then get the contents of the buffer using toString when you're done.

StringWriter buffer = new StringWriter();
PrintWriter writer = new PrintWriter(buffer);
foo.print(writer);

String contents = buffer.toString();
myTextArea.setText(contents);

This only writes to the textarea once the library method finishes writing to the PrintWriter though. Did you need it to update the textarea while the library method is executing?