[玩一玩]给命令行做一个GUI,JAVA版,增加TAB补全功能

[beiouwolf]

原帖不能修改...再开一个吧~~
原帖地址:http://topic.csdn.net/u/20120704/13/0ad22896-145d-4a96-a2ac-2fdef5ae1729.html?1521710613

加上了有人怨念的TAB补全功能...
基本逻辑是,查找当前执行路径和系统PATH路径下的可执行文件
如果找到1个匹配的,将文件名补全到命令框中
如果找到多个匹配,将文件名罗列到结果框中

顺便BS一下CSDN的相册...上传那个FLASH老是加载不上...


效果图:



源代码:

package consoleGUI;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.File;
import java.io.FilenameFilter;
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);
		tf_cmd.setFocusTraversalKeysEnabled(false);
		
		this.getContentPane().add(topPanel,BorderLayout.NORTH);
		
		// 显示结果
		JScrollPane resultPanel = new JScrollPane(ta_result = new JTextArea(10,10));
		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();
			}
		});
		
		
		this.tf_cmd.addKeyListener(new KeyAdapter() {
			@Override
			public void keyReleased(KeyEvent e) {
				// 命令框中按下回车键的事件
				if(e.getKeyCode() == KeyEvent.VK_ENTER) {
					btn_run.doClick();
					tf_cmd.setText("");
				}
				// 命令框中按下TAB键的事件
				if(e.getKeyCode() == KeyEvent.VK_TAB) {
					if(!tf_cmd.getText().equals("")) {
						TabResult result = pressTab(tf_cmd.getText());
						if(result != null) {
							if(result.multi) {
								StringBuilder sb = new StringBuilder();
								for(int i = 0; i < result.filenames.length; ++i)
									sb.append(result.filenames[i]).append('\t').append((i+1) % 5 == 0 ? "\n" : "");
								ta_result.setText(sb.toString());
							} else
								tf_cmd.setText(result.result + " ");
						} else
							Toolkit.getDefaultToolkit().beep();
					}
				}
			}
		});
	}
	
	// TAB 查找命令的结果
	private class TabResult {
		boolean multi;
		String result;
		String[] filenames;
		
		public TabResult(String result) {
			this.multi = false;
			this.result = result;
		}
		public TabResult(File[] files) {
			this.multi = true;
			String[] filenames = new String[files.length];
			for(int i = 0; i < filenames.length; ++ i)
				filenames[i] = files[i].getName();
			this.filenames = filenames;
		}
	}
	// 按下TAB时的动作
	private TabResult pressTab(String startwith) {
		FilenameFilter fileFilter = new CmdFileFilter(startwith);
		
		// 首先查找执行路径
		File currentDir = new File("./");
		File file[] = currentDir.listFiles(fileFilter);
		if(file.length > 0)
			return file.length > 1 ? new TabResult(file) : new TabResult(file[0].getName());
		
		// 搜索系统PATH路径
		String[] systemEnvPath =  System.getenv().get("Path").split(";");
		return checkSystemEnvPath(fileFilter,systemEnvPath,0);
	}
	// 遍历系统路径
	private TabResult checkSystemEnvPath(FilenameFilter fileFilter,String[] systemEnvPath,int index) {
		if(index >= systemEnvPath.length)
			return null;
		
		File file[] = new File(systemEnvPath[index]).listFiles(fileFilter);
		if(file.length > 0)
			return file.length > 1 ? new TabResult(file) : new TabResult(file[0].getName());
		else
			return checkSystemEnvPath(fileFilter, systemEnvPath, ++index);
	}
	// TAB查找时用来过滤文件名
	private class CmdFileFilter implements FilenameFilter {
		private String startwith;
		public CmdFileFilter(String startwith) {
			this.startwith = startwith;
		}
		@Override
		public boolean accept(File dir, String name) {
			// TODO 谁知道怎么匹配系统内部命令 比如DIR这种?
			return name.startsWith(startwith) && 
					(
					name.endsWith(".exe") || name.endsWith(".com") ||
					name.endsWith(".bat")
					);
		}
		
	}
	
	// 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();
	}
}

package consoleGUI;

import java.io.IOException;
import java.io.InputStream;
import javax.swing.JTextArea;

public class ConsoleIntercepter extends Thread{

	private JTextArea text;
	private InputStream is;

	public ConsoleIntercepter(JTextArea text,InputStream is) {
		this.text = text;
		this.is = is;
	}
	
	@Override
	public void run() {
		byte[] buf = new byte[1024];
		int size;
		while(true) {
			try {
				while((size = is.read(buf)) != -1) {
					text.append(new String(buf,0,size,"gbk"));
				}
			} catch (IOException e) {
				e.printStackTrace();
				break;
			}
		}
	}

}