2003-10-12

由 jini 所撰寫。最後修改者是 jini 在 1758 天之前。已瀏覽 1084 次。

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Barbecue - Java Barcode 20:29

今天 jsptw 有人問到如何在 java 使用 barcode, 之前我都是使用 activx 元件來使用的. 不過有平台限制的問題. only for windows .

因此好奇查了 sourceforge, 原來有一個 BBQ ( Barbecue ) 就是處理 Java Barcode 的.

#BSD License#

Barbecue is an open-source, Java barcode library that provides the means to create barcodes for printing and display in Java applications. A number of barcode formats are supported and many more can be added via the flexible barcode API. Barcodes can be outputted to Graphics objects, or used as a Swing component, or written out as SVG. Please use the links on the left to find out more about Barbecue.

由他的簡介可以知道, 我們可以用在 Swing 也可以用 SVG 輸出.

web 使用, 其實他已經完成一個 Servlet - net.sourceforge.barbecue.BarcodeServlet ,
讓我們可以簡單地使用, 不需要花心思去真的實作他 !!

<img src="http://localhost:8080/barbecue/barcode?data=123545&height=50"/>

app 應用, 可以參考下面的 example code

import javax.swing.*;
import net.sourceforge.barbecue.BarcodeFactory;
import net.sourceforge.barbecue.Barcode;
import net.sourceforge.barbecue.BarcodeException;
import net.sourceforge.barbecue.BarcodeImageHandler;import java.awt.image.BufferedImage;
import java.awt.*;
import java.io.FileOutputStream;
import java.io.IOException;
public class Example {
	public void usingBarbecueAsSwingComponent() {
		JPanel panel = new JPanel();
		// Always get a Barcode from the BarcodeFactory
        Barcode barcode = null;
        try {
            barcode = BarcodeFactory.createCode128B("My Barcode");
        } catch (BarcodeException e) {
            // Error handling
        }
        /* Because Barcode extends Component, you can use it just like any other
		 * Swing component. In this case, we can add it straight into a panel
		 * and it will be drawn and layed out according to the layout of the panel.
		 */
		panel.add(barcode);
	}
	public void drawingBarcodeDirectToGraphics() throws BarcodeException {
		// Always get a Barcode from the BarcodeFactory
		Barcode barcode = BarcodeFactory.createCode128B("My Barcode");
		// We are created an image from scratch here, but for printing in Java, your
		// print renderer should have a Graphics internally anyway
		BufferedImage image = new BufferedImage(500, 500, BufferedImage.TYPE_BYTE_GRAY);
		// We need to cast the Graphics from the Image to a Graphics2D - this is OK
		Graphics2D g = (Graphics2D) image.getGraphics();
		// Barcode supports a direct draw method to Graphics2D that lets you position the
		// barcode on the canvas
		barcode.draw(g, 10, 56);
	}
    public void outputtingBarcodeAsAJPEGImage() throws BarcodeException {
        // Always get a Barcode from the BarcodeFactory
		Barcode barcode = BarcodeFactory.createCode128B("My Barcode");
        try {
            // We need an output stream to write the image to...
            FileOutputStream fos = new FileOutputStream("mybarcode.jpg");
            // Let the barcode image handler do the hard work
            BarcodeImageHandler.outputBarcodeAsJPEGImage(barcode, fos);
        } catch (IOException e) {
            // Error handling here
        }
    }
}