package consoleGUI;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.PrintWriter;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.border.TitledBorder;
import javax.swing.text.DefaultCaret;

public class ConsoleGUI extends JFrame {

    private static final long serialVersionUID = 1L;

    private JTextField tf_cmd;
    private JButton btn_run;
    private JTextArea ta_result;
    
    private Process process;
    private PrintWriter out;
    
    public ConsoleGUI() {
        // 窗体大小
        this.setPreferredSize(new Dimension(500,500));
        this.setTitle("命令行GUI");
        
        // 命令框及按钮
        TitledBorder titledBorder = new TitledBorder("Command input");
        JPanel topPanel = new JPanel(new BorderLayout());
        topPanel.setBorder(titledBorder);
        
        topPanel.add(tf_cmd = new JTextField(),BorderLayout.CENTER);
        topPanel.add(btn_run = new JButton("执行"),BorderLayout.EAST);
        
        this.getContentPane().add(topPanel,BorderLayout.NORTH);
        
        // 显示结果
        JScrollPane resultPanel = new JScrollPane(ta_result = new JTextArea());
        this.getContentPane().add(resultPanel);
        ((DefaultCaret)ta_result.getCaret()).setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
        
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        
        // 启动一个CMD
        try {
            this.process = Runtime.getRuntime().exec("cmd");
            // 获取CMD的输出流
            this.out = new PrintWriter(process.getOutputStream());
            // 将CMD的输入流绑定到显示框中
            new ConsoleIntercepter(ta_result, process.getInputStream()).start();
            new ConsoleIntercepter(ta_result, process.getErrorStream()).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        // 执行按钮 将命令发送给CMD
        this.btn_run.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(tf_cmd.getText().equals(""))
                    return;
                
                ta_result.setText("");
                out.println(tf_cmd.getText());
                out.flush();
            }
        });
        
        // 命令框中按下回车键的事件
        this.tf_cmd.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_ENTER) {
                    btn_run.doClick();
                    tf_cmd.setText("");
                }
            }
        });
    }
    
    // 显示窗体
    public void showFrame() {
        this.pack();
        this.setVisible(true);
    }
    
    
    public static void main(String[] args) {
        // JDK 6U10以上版本,采用Nimbus显示风格
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (Exception e) {
            System.out.println("没有安装jre6u10,尝试当前系统的风格");
            try {
                UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
        
        // 启动程序
        ConsoleGUI gui = new ConsoleGUI();
        gui.showFrame();
    }
}