如何读取控制台输出 [英] How to read console ouput

问题描述

使用Grails框架如何阅读控制台输出。我的意思是我有一个java库在我的grails应用程序，输出（system.out.println（x））到控制台，我想显示在我的grails应用程序的文本框中。我如何去做这个。

Using the Grails framework how would one go about reading console output. What I mean is I have a java library in my grails app that outputs(system.out.println("x")) to the console and I want to display this in a textbox in my grails app. How do I go about doing this.

我不想将消息写入文件并以这种方式读取数据。是否有直接从控制台读取。

I dont want to have to write the messages out to a file and read them in that way or to a database. Is there someway of directly reading from the console.

提前感谢。

EDIT **

它是我使用的第三方jar文件

Its a third party jar file that I am using

推荐答案

输出与System.setOut（）方法。下面是一个快速示例，在五秒后将System.out重定向到文本窗格：

You can redirect the output with the System.setOut() method. Here is a quick example that redirects System.out to a text pane after five seconds:

import javax.swing.*;
import java.awt.*;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Date;

public class TextCapture {

    public static void main(String[] args) throws Exception {
        JFrame jf = new JFrame();
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        final JTextArea jta = new JTextArea();
        jta.setPreferredSize(new Dimension(400, 200));
        jf.getContentPane().add(jta);
        jf.pack();
        jf.setVisible(true);

        OutputStream textOS = new OutputStream() {
            @Override
            public void write(int b) throws IOException {
                jta.setText(jta.getText() + ((char)b));
            }
        };

        for(int i = 0; i < 20; i++) {
            Thread.sleep(1000);
            if(i == 5) {
                System.setOut(new PrintStream(textOS));
            }
            System.out.println(String.valueOf(new Date()));
        }
    }

}

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