Java 通過Zxing生成二維碼

Java 通過Zxing生成二維碼

１．基本類提供二維碼生成工具類

package com.green.util;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.BitMatrix;
public final class MatrixToImageWriter {

private static final int BLACK = 0xFF000000;

private static final int WHITE = 0xFFFFFFFF;

private MatrixToImageWriter() {

}

public static BufferedImage toBufferedImage(BitMatrix matrix) {

int width = matrix.getWidth();

int height = matrix.getHeight();

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < width; x++) {

for (int y = 0; y < height; y++) {

image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);

}

}

return image;

}

public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {

BufferedImage image = toBufferedImage(matrix);

if (!ImageIO.write(image, format, file)) {

throw new IOException("Could not write an image of format " + format + " to " + file);

}

}

public static byte[] writeToStream(BitMatrix matrix, String format) throws IOException {

ByteArrayOutputStream stream=new ByteArrayOutputStream();

BufferedImage image = toBufferedImage(matrix);

if (!ImageIO.write(image, format, stream)) {

throw new IOException("Could not write an image of format " + format);

}

return stream.toByteArray();

}

}

２．調用工具方法獲取圖片的二進制

package com.green.util;

import java.io.File;

import java.io.IOException;

import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.WriterException;

import com.google.zxing.common.BitMatrix;

/**

* @author maybo

*

*/

public class QrCodeGenerator {

public static byte[] build(String content) throws IOException, WriterException {

int width = 300;

int height = 300;

//��ά���ͼƬ��ʽ

String format = "gif";

Hashtable hints = new Hashtable();

//������ʹ�ñ���

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

BitMatrix bitMatrix = new MultiFormatWriter().encode(content,

BarcodeFormat.QR_CODE, width, height, hints);

return MatrixToImageWriter.writeToStream(bitMatrix, format);

}

}