请教Java的Frame框架遇到的问题

Question

怎样把控制台中输出的东西在Frame框架中的滚动窗口中输出。在线急等赐教

Answer 1

// 核心代码就是重定向输出流的位置，这里需要复写print方法

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class OutCapture extends JFrame {

    private static final long serialVersionUID = -7094759145284455963L;

    public OutCapture() {
        Container contentPane = this.getContentPane();
        contentPane.setLayout(new BorderLayout());

        final JTextArea textArea = new JTextArea();
        JScrollPane scrollPanel = new JScrollPane();
        scrollPanel.setViewportView(textArea);
        contentPane.add(scrollPanel, BorderLayout.CENTER);

        JButton btn = new JButton("输出");
        contentPane.add(btn, BorderLayout.SOUTH);
        btn.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                for (int i = 0; i < 100; i++) {
                    System.out.println(i);
                }
            }
        });

        // 核心代码就是重定向输出流的位置，这里需要复写print方法
        System.setOut(new PrintStream(new OutputStream() {
            @Override
            public void write(int b) throws IOException {

            }
        }, true) {
            @Override
            public void print(String txt) {
                textArea.append(txt);
                textArea.setCaretPosition(textArea.getText().length());
            }

            @Override
            public void println(String txt) {
                print(txt + "\n");
            }

            @Override
            public void print(boolean b) {
                print(b ? "true" : "false");
            }

            public void println(boolean b) {
                print(String.valueOf(b) + "\n");
            }

            @Override
            public void print(char c) {
                print(String.valueOf(c));
            }

            public void println(char c) {
                print(String.valueOf(c) + "\n");
            }

            @Override
            public void print(int i) {
                print(String.valueOf(i));
            }

            public void println(int i) {
                print(String.valueOf(i) + "\n");
            }

            @Override
            public void print(long l) {
                print(String.valueOf(l));
            }

            public void println(long l) {
                print(String.valueOf(l) + "\n");
            }

            @Override
            public void print(double d) {
                print(String.valueOf(d));
            }

            public void println(double d) {
                print(String.valueOf(d) + "\n");
            }

            @Override
            public void print(float f) {
                print(String.valueOf(f));
            }

            public void println(float f) {
                print(String.valueOf(f) + "\n");
            }

            @Override
            public void print(char s[]) {
                print(String.valueOf(s));
            }

            public void println(char s[]) {
                print(String.valueOf(s) + "\n");
            }

            @Override
            public void print(Object obj) {
                print(String.valueOf(obj));
            }

            public void println(Object obj) {
                print(String.valueOf(obj) + "\n");
            }

        });
    }

    public static void main(String[] args) {
        OutCapture oc = new OutCapture();
        oc.setLocationRelativeTo(null);
        oc.setSize(400, 400);
        oc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        oc.setVisible(true);
    }
}