Java 命令行工具

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我使用JAVA swing做了一个命令行工具:

 使用的核心技术是SwingWorker,运行效果:

 

 核心工具类:

public class ShellSwingWorker extends SwingWorker {
	/***
	 * 执行命令的正常输出（对程序来说是输入）
	 */
	private BufferedReader br_right = null;
	/***
	 * 执行命令的错误输出（对程序来说是输入）
	 */
	private BufferedReader br_error = null;
	/***
	 * 进程封装类
	 */
	private MyProcess myprocess = null;
	private char word = ' ';
	private int tmp = 0;
	private boolean isPrintVerbose = false;
	private StringBuffer stringbuf = new StringBuffer();
	private JTextPane resultTP = null;
	/***
	 * result textarea' document
	 */
	private Document docment;
	/***
	 * charset of result
	 */
	private String encoding;
	/***
	 * logging
	 */
	protected Logger logger = Logger.getLogger(this.getClass());
	/***
	 * 命令前缀
	 */
	
	public ShellSwingWorker(MyProcess myprocess, BufferedReader br) {
		this.br_right = br;
		this.myprocess = myprocess;

	}

	/***
	 * 构造方法.
	 * 
	 * @param process
	 * @param textPane
	 * @param encoding
	 */
	public ShellSwingWorker(Process process, JTextPane textPane,
			String encoding)
	{
		MyProcess proc = null;
		proc=new MyProcess(process);
		construct(proc,textPane,encoding);
	}
	/***
	 * 构造方法.
	 * 
	 * @param myprocess
	 * @param textPane
	 * @param encoding
	 */
	public ShellSwingWorker(MyProcess myprocess, JTextPane textPane,
			String encoding) {
		construct(myprocess, textPane, encoding);

	}

	private void construct(MyProcess myprocess, JTextPane textPane,
			String encoding){
		this.myprocess = myprocess;
		if (ValueWidget.isNullOrEmpty(encoding)) {
			encoding = SystemHWUtil.CURR_ENCODING;
		}
		this.encoding = encoding;
		try {
			br_right = new BufferedReader(new InputStreamReader(
					myprocess.getInputStream(), this.encoding), 4096);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		try {
			br_error = new BufferedReader(new InputStreamReader(
					myprocess.getErrorStream(), this.encoding), 4096);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		this.resultTP = textPane;
		docment = this.resultTP.getDocument();
	}
	@Override
	protected Boolean doInBackground() throws Exception {
		while ((tmp = br_right.read()) != -1) {
			word = (char) tmp;
			publish(word);
		}
		while ((tmp = br_error.read()) != -1) {
			word = (char) tmp;
			publish(word);
		}
		if (isPrintVerbose)// 是否打印详细信息
		{
			System.out.println("doInBackground() over");
		}
		return true;
	}

	@Override
	protected void process(List chunks) {
		for (char temp : chunks) {
			{
				// System.out.print(temp);
				// this.resultTP.setText(this.stringbuf.toString());//效率低
				int leng2 = this.stringbuf.length();
				try {
					// 追加
					docment.insertString(leng2, String.valueOf(temp), null);
				} catch (BadLocationException e) {
					GUIUtil23.warningDialog(e.getMessage());
					e.printStackTrace();
				}
				this.stringbuf.append(temp);
			}
		}
	}

	public StringBuffer getStringbuf() {
		return stringbuf;
	}

	/***
	 * main thread can't execute next command(below waitFor()) until done() is
	 * executed;if done() hasn't be executed,this.myprocess.waitFor() will wait
	 */
	@Override
	protected void done() {
		if (isPrintVerbose) {
			System.out.println("done() is executed");
		}
		if (!ValueWidget.isNullOrEmpty(br_right)) {
			try {
				br_right.close();
				br_error.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		String logMesg=this.getClass().getSimpleName()+".done() is executed successfully.";
		logger.debug(logMesg);
		System.out.println(logMesg);
		this.myprocess.stopLoop();
	}

	public MyProcess getProcess() {
		return myprocess;
	}

 项目采用maven构建,结构如下:

笔记: 

遇到的问题

（1）卡了？

为什么呢？确实是使用的线程啊？

原因：

@Override     protectedvoid process(List chunks)     {         for (char temp : chunks)         {             { //                System.out.print(temp);                 this.stringbuf.append(temp);                this.resultTP.setText(this.stringbuf.toString());                                           }         }     }

标红的代码影响性能

解决方法：

 

 

 

 

 

 

swingwork中done()方法还没有完全执行完毕，就执行proc.waitFor()后面的语句

使用swingwork 可以在界面上异步的看到执行结果，而不是等待执行完之后才一次性打印出来，影响用户体验。这就是swingwork存在的目的。

解决方法：

对Process进行封装，看下面标黄的代码，若loop为true则会死循环，一直等待。

package com.common.util;   import java.io.InputStream; import java.io.OutputStream;   publicclass MyProcess extends Process {     private Process proc;     privatebooleanloop=true;             public Process getProc()     {         returnproc;     }       publicboolean isLoop()     {         returnloop;     }       /***      * should be invoked in end      */     public  int waitFor()             throws InterruptedException{         int waitFor_exitcode= proc.waitFor();         /*must wait until ShellSwingWorker.done() is executed. */         while (loop)         {             Thread.sleep(100);         }         return waitFor_exitcode;     }         publicvoid stopLoop(){         loop=false;     }       public  OutputStream getOutputStream(){         returnproc.getOutputStream();     }         public  InputStream getInputStream(){         returnproc.getInputStream();     }       public  InputStream getErrorStream(){         returnproc.getErrorStream();     }     public  int exitValue(){         returnproc.exitValue();     }     public MyProcess(Process proc)     {         super();         this.proc = proc;     }       @Override     publicvoid destroy()     {         this.proc.destroy();             } }

 

那么时候终止循环呢？

在swingwork的done（）方法中：

@Override    protectedvoid done() {       if (isPrintVerbose) {          System.out.println("done() is executed");       }       if (!ValueWidget.isNullOrEmpty(br_right)) {          try {             br_right.close();             br_error.close();          } catch (IOException e) {             e.printStackTrace();          }       }       this.myprocess.stopLoop();    }

 

下面是有问题的：

Process p3=pb.start();          ShellSwingWorker worker = new ShellSwingWorker(p3, resultTP,                 encoding);          worker.execute();          Process proc = worker.getProcess();          p3.waitFor();          System.out.println("proc.waitFor() is executed.");          // result2 = worker.getStringbuf().toString();          int exitCode2 = proc.exitValue();

 

执行结果：

 

下面的事正确的：

ShellSwingWorker worker = new ShellSwingWorker(pb.start(), resultTP,                 encoding);          worker.execute();          Process proc = worker.getProcess();          proc.waitFor();          System.out.println("proc.waitFor() is executed.");          // result2 = worker.getStringbuf().toString();          int exitCode2 = proc.exitValue();

执行结果如下：

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

项目源代码见附件:sh_script_executor.zip

 

 

 

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• sh_script_executor.zip (11.7 KB)
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