ZXing 二维码 Demo

ZXing 是Google上的一个开源项目,功能强大, 可以支持各种条形码,二维码的编码和解码。
点这里可以了解原始项目情况。
http://code.google.com/p/zxing/
https://github.com/zxing/zxing
网上有很多关于ZXing 二维码使用的Demo.

不才仔细查看了Zxing的源代码,感觉有些类的封装和部分接口的设计不是特别适合我个人的口味。
1. 二维码的属性参数用Map的形式传入,初学者要仔细阅读文档后才能知道应该在Map里面放些什么东西,不那么直观。
2. MultiFormatWriter的encode 方法输入参数里面包含了输出图像的高和宽,本人私下认为没有这个必要。原因,一是二维码的行和列编码后已经明确了,例如一个50乘以50的二维码,如果用户输入一个49像素,或者75像素意义不大,49像素太小,75像素不是50的整数倍,这导致每个细胞的像素是1.5,毕竟没有半个像素这个说法,所以这样设计接口增加了内部逻辑的复杂度。
3.考虑到实际应用,输入就是一个字符串,输出一般就是个二维码,或者图片。所以接口最好也设计成这个样子,比较贴近生活。
4.本人注意到QRCode类的内部表示是一个byte型的二维数组,byte的取值范围大0~255,本人愚钝,本来还以为这里面存了什么复杂的数据, 但是实际上里面存储的只有0和1, 既然如此,不如改成 qrcode.jar 那个项目的风格,用boolean二维数组更加直接。

以下是本人重新封装的代码, 班门弄斧,让大家见笑。
Encoder.java
package home.ibm.tony.zxing.qrcode;

import java.awt.image.BufferedImage;

import com.google.zxing.WriterException;
import com.google.zxing.qrcode.encoder.QRCode;

public interface Encoder {

	public BufferedImage encode2Image(String content)
			throws WriterException;
	
	
	public BufferedImage encode2Image(String content, QRCodeProperties properties)
			throws WriterException;
	
	
	public QRCode encode(String content)
			throws WriterException;
	
	
	public QRCode encode(String content, QRCodeProperties properties)
			throws WriterException;
}

QRCodeEncoder.java
package home.ibm.tony.zxing.qrcode;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import com.google.zxing.WriterException;
import com.google.zxing.qrcode.encoder.QRCode;

public class QRCodeEncoder implements Encoder {

	QRCodeProperties defaultProperties = new QRCodeProperties();
	
	@Override
	public BufferedImage encode2Image(String content) throws WriterException {
	 
		return convert(encode(content), defaultProperties);
	}

	@Override
	public BufferedImage encode2Image(String content,
			QRCodeProperties properties) throws WriterException {
		 
		return convert(encode(content), properties);
	}

	@Override
	public QRCode encode(String content) throws WriterException {
		
		return encode(content, defaultProperties);
	}

	@Override
	public QRCode encode(String content, QRCodeProperties properties)
			throws WriterException {

		return com.google.zxing.qrcode.encoder.Encoder.encode(content,
				properties.getErrorCorrection());

	}

	
	public static BufferedImage convert(QRCode qrcode, QRCodeProperties properties ){

		int pixelSize = properties.getCellSize();
		int margin = properties.getMargin(); 
		
		boolean[][] result = toArray(qrcode);
		
		
		int imageSize = result.length * pixelSize + margin * 2;

		BufferedImage image = new BufferedImage(imageSize, imageSize,
				BufferedImage.TYPE_INT_RGB);
		Graphics2D g = image.createGraphics();
		g.setBackground(properties.getBgColor());  
		g.clearRect(0, 0, imageSize, imageSize);
		g.setColor(properties.getFgColor());  

		for (int i = 0; i < result.length; i++) {
			for (int j = 0; j < result.length; j++) {
				if (result[j][i]) {
					g.fillRect(j * pixelSize + margin, i * pixelSize + margin,
							pixelSize, pixelSize);
				}
			}
		}

		g.dispose();
		image.flush();
		
		return image;
	}

	public static boolean[][] toArray(QRCode qrcode) {
		byte[][] array = qrcode.getMatrix().getArray();
		boolean[][] result = new boolean[array.length][array[0].length];
		for (int i = 0; i < array.length; i++) {
			for (int j = 0; j < array[i].length; j++) {
				 System.out.print(array[i][j]);
				 result[i][j]= array[j][i] > 0 ?  true : false;
			}
			System.out.println();
		}
		
		return result;
	}
}


QRCodeProperties.java
package home.ibm.tony.zxing.qrcode;

import java.awt.Color;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeProperties {

	private Color bgColor = Color.WHITE;

	private int cellSize = 3;

	private ErrorCorrectionLevel errorCorrection = ErrorCorrectionLevel.M;

	private Color fgColor = Color.BLACK;

	private int margin = 2;

	private int version = 6;

	public Color getBgColor() {
		return bgColor;
	}

	public int getCellSize() {
		return cellSize;
	}

	public ErrorCorrectionLevel getErrorCorrection() {
		return errorCorrection;
	}

	public Color getFgColor() {
		return fgColor;
	}

	public int getMargin() {
		return margin;
	}

	public int getVersion() {
		return version;
	}

	public void setBgColor(Color bgColor) {
		this.bgColor = bgColor;
	}

	public void setCellSize(int cellSize) {
		this.cellSize = cellSize;
	}

	public void setErrorCorrection(ErrorCorrectionLevel errorCorrection) {
		this.errorCorrection = errorCorrection;
	}

	public void setFgColor(Color fgColor) {
		this.fgColor = fgColor;
	}

	public void setMargin(int margin) {
		this.margin = margin;
	}

	public void setVersion(int version) {
		this.version = version;
	}
	
	
	
}


QRCodeDemo.java
package home.ibm.tony.zxing.qrcode;

 
import home.ibm.tony.qrcode.EnhancedQRCodeDecoder;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.google.zxing.WriterException;

public class QRCodeDemo {

	public static void main(String[] args) throws IOException, WriterException {
		String imgPath = "c:/z.png";
		String encoderContent = "http://ieqq.iteye.com/blog/2114077";

		QRCodeEncoder encoder = new QRCodeEncoder();

		ImageIO.write(encoder.encode2Image (encoderContent), "png", new File(imgPath));

		System.out.println("========encoder success");
		 
	}
}

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转载自ieqq.iteye.com/blog/2115304
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