textviewer.java

100多M的J2EE培训内容

/*
 * @(#)TextViewer.java	1.12 01/05/23
 *
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES OR LIABILITIES
 * SUFFERED BY LICENSEE AS A RESULT OF  OR RELATING TO USE, MODIFICATION
 * OR DISTRIBUTION OF THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL
 * SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
 * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS
 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that Software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

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	1.12, 01/05/23
 * @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());

    }
}