以前写JAVA时想练练手写一个编辑器，涉及到JAVA代码的编译部分，考虑调用用javac.exe来编译，一下这段代码是用于将编译后产生的错误信息反馈到GUI上.同理，在cmd下执行的任何命令都可以反馈到GUI中.
//运行效果图
//以下代码用到了SWT相关的包
import java.io.IOException; 
import java.io.InputStream; 
import org.eclipse.swt.SWT; 
import org.eclipse.swt.events.SelectionAdapter; 
import org.eclipse.swt.events.SelectionEvent; 
import org.eclipse.swt.widgets.Button; 

import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Label; 
import org.eclipse.swt.widgets.Shell; 
import org.eclipse.swt.widgets.Text; 
import com.swtdesigner.SWTResourceManager; 


public  class CmdShell { 

private Text text_1; 
private Text text; 
protected Shell shell; 

/** 
  * Launch the application 
  * @param args 
  */ 
public  static  void main(String[] args) { 
   try { 
   CmdShell window =  new CmdShell(); 
   window.open(); 
  }  catch (Exception e) { 
   e.printStackTrace(); 
  } 
} 

/** 
  * Open the window 
  */ 
public  void open() { 
   final Display display = Display.getDefault(); 
  createContents(); 
  shell.open(); 
  shell.layout(); 
   while (!shell.isDisposed()) { 
    if (!display.readAndDispatch()) 
    display.sleep(); 
  } 
} 

/** 
  * Create contents of the window 
  */ 
protected  void createContents() { 
  shell =  new Shell(SWT.MIN | SWT.CLOSE | SWT.TITLE | SWT.RESIZE); 
  shell.setImage(SWTResourceManager.getImage(CmdShell. class, "/org/eclipse/jface/dialogs/images/title_banner.png")); 
  shell.setSize(415, 375); 
  shell.setText( "CmdShellDemo"); 

   final Button button =  new Button(shell, SWT.NONE); 
  button.addSelectionListener( new SelectionAdapter() { 
    public  void widgetSelected(SelectionEvent e) { 
    cmdShell(); 
   } 
  }); 
  button.setImage(SWTResourceManager.getImage(CmdShell. class,  "/org/eclipse/jface/dialogs/images/message_info.gif")); 
  button.setText( "执行命令"); 
  button.setBounds(310, 25, 85, 24); 

  text =  new Text(shell, SWT.BORDER); 
  text.setBackground(SWTResourceManager.getColor(202, 228, 240)); 
  text.setBounds(10, 27, 294, 22); 

  text_1 =  new Text(shell, SWT.V_SCROLL | SWT.BORDER | SWT.WRAP | SWT.H_SCROLL); 
  text_1.setForeground(SWTResourceManager.getColor(255, 0, 0)); 
  text_1.setFont(SWTResourceManager.getFont( "宋体", 10, SWT.NONE)); 
  text_1.setBounds(10, 61, 385, 277); 

   final Label label =  new Label(shell, SWT.NONE); 
  label.setText( "请在下列输入框中输入CMD命令"); 
  label.setBounds(10, 9, 294, 12); 
   // 
} 
  

//执行命令 
private  void cmdShell(){ 
      int read; 
           try { 
              Process ps = Runtime.getRuntime().exec(text.getText()); 
              InputStream is = ps.getInputStream(); 
              InputStream ts=ps.getErrorStream(); 
              StringBuffer out =  new StringBuffer(); 
               byte[] b =  new  byte[1024]; 
              read=ts.read(b); 
               while ( (read = ts.read(b)) != -1) { 
               out.append( new String(b, 0, read)); 
              } 
              text_1.append( new String(out)); 
          } 
           catch (IOException ex) { 
              ex.printStackTrace(); 
          } 
} 

}