java生成二维码

最新推荐文章于 2021-02-21 08:46:10 发布

转载最新推荐文章于 2021-02-21 08:46:10 发布 · 196 阅读

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本文介绍了一种使用Java实现将文字信息转换为二维码的方法。通过使用Google ZXing库，包括MultiFormatWriter和MatrixToImageWriter类，可以创建指定大小的二维码，并将其保存为GIF格式的文件。

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package com.ce.erweima.demo;

import java.io.File;
import java.util.Hashtable;

import com.ce.erweima.util.MatrixToImageWriter;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
/**
 * 将文字转换成二维码
 */
public class Encoder {
	public static void main(String[] args) throws Exception {
		String text = "https://blog.youkuaiyun.com/qq_20124743/article/details/78905220";
		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE, 300, 300, hints);
		MatrixToImageWriter.writeToFile(bitMatrix, "gif", new File("D:/aa.gif"));
		System.out.println("二维码生成完成");
	}
}

util类
package com.ce.erweima.util;
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;
	}
	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 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);
		}
	}
}

使用到的jar包 core.jar javase.jar