java 根据链接地址生成二维码图

深碍√TFBOYSˉ_ 2022-04-03 09:09 227阅读 0赞

1.所需jar包：core-3.3.3.jar

2.工具类：ZxingUtils.java

package com.mdq.dctree.util;

import com.google.zxing.BarcodeFormat;  
import com.google.zxing.EncodeHintType;  
import com.google.zxing.MultiFormatWriter;  
import com.google.zxing.common.BitMatrix;  
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import org.apache.commons.logging.Log;  
import org.apache.commons.logging.LogFactory;

import javax.imageio.ImageIO;

import java.awt.image.BufferedImage;  
import java.io.File;  
import java.io.IOException;  
import java.util.Hashtable;  
import java.util.Map;

public class ZxingUtils \{

private static Log log = LogFactory.getLog(ZxingUtils.class);

private static final int BLACK = 0xFF000000;

private static final int WHITE = 0xFFFFFFFF;

private 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;

\}

private 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);

\}

\}

/\*\* 将内容contents生成长宽均为width的图片，图片路径由imgPath指定

\*/

public static File getQRCodeImge(String contents, int width, String imgPath) \{

return getQRCodeImge(contents, width, width, imgPath);

\}

/\*\* 将内容contents生成长为width，宽为width的图片，图片路径由imgPath指定

\*/

public static File getQRCodeImge(String contents, int width, int height, String imgPath) \{

try \{

Map<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();

hints.put(EncodeHintType.ERROR\_CORRECTION, ErrorCorrectionLevel.M);

hints.put(EncodeHintType.CHARACTER\_SET, "UTF8");

BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR\_CODE, width, height, hints);

File imageFile = new File(imgPath);

writeToFile(bitMatrix, "png", imageFile);

return imageFile;

\} catch (Exception e) \{

log.error("create QR code error!", e);

return null;

\}

\}

\}

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