在java中調用dos命令，摹擬DOS窗口

来源：互联网发布：社交软件的盈利模式编辑：程序博客网时间：2024/06/04 10:46

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;

import javax.swing.*;

public class DosCmdW extends JFrame ...{
    private static DosCmdW self;
    ProcessBuilder pb = new ProcessBuilder("cmd.exe");
    Process p ;
    InputStream is;
    OutputStream os;
    byte[] buf = new byte[1024*16];

    private JTextArea txaCmd = new JTextArea();
    private JScrollPane sclpane = new JScrollPane(txaCmd,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    private JToolBar toolbar = new JToolBar();
    private JButton btnExec = new JButton(new ImageIcon("../exec.jpg"));
    private JButton btnClear = new JButton(new ImageIcon("../clear.jpg"));

    private JPanel content = (JPanel)this.getContentPane();
    Timer tm = new Timer(500,new ActionListener()...{

        public void actionPerformed(ActionEvent arg0) ...{
            if(is==null) return;
            try...{
                while(is.available()>0)...{
                    int count = is.read(buf,0,1024);
                    String str = new String(buf,0,count,"GB2312");
                    txaCmd.append(str);
                }
            }catch(Exception ex)...{
                ex.printStackTrace();
            }

        }

    });
    private void init()...{
        this.setTitle("cmd window");
        this.setSize(500,200);
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        btnExec.setBorderPainted(false);
        btnClear.setBorderPainted(false);
        Font font = new Font(null,Font.BOLD,14);
        txaCmd.setFont(font);
        txaCmd.setBackground(Color.BLACK);
        txaCmd.setForeground(Color.WHITE);

        toolbar.setSize(500,20);
        sclpane.setSize(493,152);




        content.setLayout(null);
        content.add(toolbar);
        content.add(sclpane);

        toolbar.setFloatable(true);
        toolbar.setRollover(false);
        toolbar.add(btnExec);
        toolbar.add(btnClear);
        btnExec.setLocation(0, 0);

        toolbar.setLocation(0,0);
        sclpane.setLocation(0,toolbar.getHeight()+2);

        try ...{
            p = pb.start();
        } catch (IOException e1) ...{
            e1.printStackTrace();
        }

        is = p.getInputStream();
        os = p.getOutputStream();

        btnExec.addActionListener(new ActionListener()...{
            public void actionPerformed(ActionEvent arg0) ...{
                String strcmd = txaCmd.getSelectedText().trim();
                if(strcmd.length()==0) return;
                try ...{
                    os.write((strcmd+" ").getBytes());
                    os.flush();
                } catch (Exception e) ...{
                    e.printStackTrace();
                }
                txaCmd.setCaretPosition(txaCmd.getDocument().getLength());
            }

        });

        btnClear.addActionListener(new ActionListener()...{

            public void actionPerformed(ActionEvent arg0) ...{
                txaCmd.setText("");
            }

        });
        tm.start();
    }


    private DosCmdW()...{
        init();
    }

    public static DosCmdW getInstance()
    ...{
        if(self!=null)
            return self;
        else...{
            self = new DosCmdW();
            return self;
        }
    }

}

以上代碼的要點在於，用ProcessBuilder創建cmd進程。然後獲取cmd進程的OutputStream和InputStream。往OutputStream中寫命令（例如“dir” “cd /”等等）的時候有兩個地方要著意：1.os.write((strcmd+"/r/n").getBytes()); 這句代碼中的“/r/n”不可以省略 2. os.flush(); 這句代碼一定要寫的。

用定時器從InputStream 中讀取dos窗口的輸出，并將結果寫到JTextArea中。