barcode.java

这是个国外JAVA爱好者写的条形码生成器

     *
     * @return The width of this component
     */
    public int getWidth() {
        return (int) getActualSize().getWidth();
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @return The height of this component
     */
    public int getHeight() {
        return (int) getActualSize().getHeight();
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @return The bounds of this component
     */
    public Rectangle getBounds() {
        return getBounds(new Rectangle());
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @param rv The rectangle to set the bounds on
     * @return The updated rv
     */
    public Rectangle getBounds(Rectangle rv) {
        rv.setBounds(getX(), getY(), (int) getActualSize().getWidth() + getX(),
                (int) getActualSize().getHeight() + getY());
        return rv;
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @return The preferred size of this component
     */
    public Dimension getPreferredSize() {
        return getActualSize();
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @return The minimum size of this component
     */
    public Dimension getMinimumSize() {
        return getActualSize();
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @return The maximum size of this component
     */
    public Dimension getMaximumSize() {
        return getActualSize();
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @return The actual size of this component
     */
    public Dimension getSize() {
        return getActualSize();
    }

    /**
     * Renders this <code>Barcode</code> at the specified location in
     * the specified {@link java.awt.Graphics2D Graphics2D} context.
     * The origin of the layout is placed at x,&nbsp;y.  Rendering may touch
     * any point within <code>getBounds()</code> of this position.  This
     * leaves the <code>g2</code> unchanged.
     *
     * @param g The graphics context
     * @param x The horizontal value of the upper left co-ordinate of the bounding box
     * @param y The vertical value of the upper left co-ordinate of the bounding box
     */
    public void draw(Graphics2D g, int x, int y) throws OutputException {
        this.x = x;
        this.y = y;

        Output output = new GraphicsOutput(g, font, getForeground(), getBackground());
        size = draw(output, x, y, barWidth, barHeight);
    }

    public void output(Output output) throws OutputException {
        draw(output, 0, 0, barWidth, barHeight);
    }

    protected abstract Module[] encodeData();

    protected abstract Module calculateChecksum();

    protected abstract Module getPreAmble();

    protected abstract Module getPostAmble();

    protected abstract Dimension draw(Output output, int x, int y, int barWidth, int barHeight) throws OutputException;

    /**
     * Returns the text that will be displayed underneath the barcode (if requested).
     *
     * @return The text label for the barcode
     */
    public String getLabel() {
        if (label != null) {
            return label;
        } else {
            return beautify(data);
        }
    }

    /**
     * Sets the human readable text to be displayed underneath the barcode.
     * If set to null then the text will automaticaly be generated.
     *
     * @param label the human readable barcode text
     * @see #getLabel()
     */
    public void setLabel(String label) {
        this.label = label;
    }

    protected int calculateMinimumBarHeight(int resolution) {
        return 0;
    }

    /**
     * From {@link javax.swing.JComponent JComponent}.
     *
     * @param g The graphics to paint the component onto
     */
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Insets insets = getInsets();
        try {
            draw((Graphics2D) g, insets.left, insets.top);
        } catch (OutputException e) {
            // Don't draw anything
        }
    }

    // TODO: Move this to the output
    protected int getResolution() {
        if (resolution > 0) {
            return resolution;
        }
        return EnvironmentFactory.getEnvironment().getResolution();
    }

    protected int drawModule(Module module, Output output, int x, int y, int barWidth, int barHeight) throws OutputException {
        if (module == null) {
            return 0;
        }
        return module.draw(output, x, y, barWidth, barHeight);
    }

    protected String beautify(String s) {
        StringBuffer buf = new StringBuffer();
        StringCharacterIterator iter = new StringCharacterIterator(s);
        for (char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
            if (Character.isDefined(c) && !Character.isISOControl(c)) {
                buf.append(c);
            }
        }
        return buf.toString();
    }

    private void invalidateSize() {
        size = null;
    }

    private Dimension getActualSize() {
        if (size == null) {
            size = calculateSize();
        }
        return size;
    }

    private Dimension calculateSize() {
        Dimension d = new Dimension();
        if (EnvironmentFactory.getEnvironment() instanceof HeadlessEnvironment) {
            try {
                d = draw(new SizingOutput(font, getForeground(), getBackground()), 0, 0, barWidth, barHeight);
            } catch (OutputException e) {
            }
        } else {
            try {
                FontMetrics fontMetrics = null;
                if (font != null) {
                    fontMetrics = getFontMetrics(font);
                }
                d = draw(new SizingOutput(font, fontMetrics, getForeground(), getBackground()), 0, 0, barWidth, barHeight);
            } catch (OutputException e) {
            }
        }

        return d;
    }
    
    public int print(Graphics g, PageFormat pageFormat, int pageIndex)
    				throws PrinterException {
    	
    	if (pageIndex >= 1) {
            return Printable.NO_SUCH_PAGE;
        }
    	
    	try
    	{
    		this.draw( (Graphics2D) g, 0, 0);
            return Printable.PAGE_EXISTS;    	
    	}
    	catch (OutputException ex)
    	{
    		throw new PrinterException(ex.getMessage()); 
    	}
        
    }
    
    public String toString()
    {
    	return this.getData();
    }
    

    
}