textviewer.java

实例大全

/*
 * @(#)TextViewer.java	1.10 99/12/09
 *
 * Copyright 1997-1999 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

import java.awt.*;
import java.io.*;
import java.beans.*;
import javax.activation.*;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;


/**
 * A very simple TextViewer Bean for the MIMEType "text/plain"
 *
 * @version	1.10, 99/12/09
 * @author	Christopher Cotton
 */

public class TextViewer extends JPanel implements CommandObject 
{

    private JTextArea text_area = null;
    private DataHandler dh = null;
    private String	verb = null;

    /**
     * Constructor
     */
    public TextViewer() {
	super(new GridLayout(1,1));

	// create the text area
	text_area = new JTextArea();
	text_area.setEditable(false);
	text_area.setLineWrap(true);

	// create a scroll pane for the JTextArea
	JScrollPane sp = new JScrollPane();
	sp.setPreferredSize(new Dimension(300, 300));
	sp.getViewport().add(text_area);
	
	add(sp);
    }


    public void setCommandContext(String verb, DataHandler dh)
	throws IOException {

	this.verb = verb;
	this.dh = dh;
	
	this.setInputStream( dh.getInputStream() );
    }


  /**
   * set the data stream, component to assume it is ready to
   * be read.
   */
  public void setInputStream(InputStream ins) {
      
      int bytes_read = 0;
      // check that we can actually read
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      byte data[] = new byte[1024];
      
      try {
	  while((bytes_read = ins.read(data)) >0)
		  baos.write(data, 0, bytes_read);
	  ins.close();
      } catch(Exception e) {
	  e.printStackTrace();
      }

      // convert the buffer into a string
      // place in the text area
      text_area.setText(baos.toString());

    }
}