~java使用zxing生成二维码~
因此需要zxing的jar包~
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class="java">package test; import com.google.zxing.common.BitMatrix; import javax.imageio.ImageIO; import java.io.File; import java.io.OutputStream; import java.io.IOException; import java.awt.image.BufferedImage; 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; } /** * 返回图片文件 * @param matrix * @param format * @param file * @throws IOException */ 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); } } /** * 返回图片流 * @param matrix * @param format * @param stream * @throws IOException */ public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, stream)) { throw new IOException("Could not write an image of format " + format); } } }
?其实就是利用BitMatrix构造一个图片~输出文件或者流~,测试~
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package test; 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; public class MatrixTest { public static void main(String[] args) throws WriterException, IOException { String text = "https://cn.jarfire.org/"; int width = 500; int height = 500; //二维码的图片格式 String format = "gif"; Hashtable hints = new Hashtable(); //内容所使用编码 hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE, width, height, hints); //生成二维码 File outputFile = new File("c:"+File.separator+"Users\\Administrator\\Desktop"+File.separator+"code.gif"); MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile); } }
File.separator→就是文件夹之间的分割符,等同于“\\”貌似最好还是用File.separator,懒的话还是用“\\”~
(顺带提一下monospace; line-height: 1.5; background-color: #fafafa;">→https://cn.jarfire.org/←这网站有很多jar包提供下载?(????)
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