生成二維碼(java後端)
阿新 • • 發佈:2018-11-29
需要引入2個jar包:
<dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.1</version> </dependency> <!-- https://mvnrepository.com/artifact/com.google.zxing/core --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.1</version> </dependency>
生成方法如下:
package com.payplatform.util; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.Binarizer; import com.google.zxing.BinaryBitmap; import com.google.zxing.EncodeHintType; import com.google.zxing.LuminanceSource; import com.google.zxing.MultiFormatReader; import com.google.zxing.MultiFormatWriter; import com.google.zxing.NotFoundException; import com.google.zxing.Result; import com.google.zxing.WriterException; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; public class QRCodeUtil { //二維碼顏色 private static final int BLACK = 0xFF000000; //二維碼顏色 private static final int WHITE = 0xFFFFFFFF; public static void main(String[] args) throws Exception { zxingCodeCreate("http://www.baidu.com", 300, 300, "D:/qrcode.jpg", "jpg"); // zxingCodeAnalyze("D:/qrcode.jpg"); } /** * 生成二維碼 * @param text 二維碼內容 * @param width 二維碼寬 * @param height 二維碼高 * @param outPutPath 二維碼生成儲存路徑 * @param imageType 二維碼生成格式 */ public static void zxingCodeCreate(String text, int width, int height, String outPutPath, String imageType){ Map<EncodeHintType, String> his = new HashMap<EncodeHintType, String>(); //設定編碼字符集 his.put(EncodeHintType.CHARACTER_SET, "utf-8"); try { //1、生成二維碼 BitMatrix encode = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, his); //2、獲取二維碼寬高 int codeWidth = encode.getWidth(); int codeHeight = encode.getHeight(); //3、將二維碼放入緩衝流 BufferedImage image = new BufferedImage(codeWidth, codeHeight, BufferedImage.TYPE_INT_RGB); for (int i = 0; i < codeWidth; i++) { for (int j = 0; j < codeHeight; j++) { //4、迴圈將二維碼內容定入圖片 image.setRGB(i, j, encode.get(i, j) ? BLACK : WHITE); } } File outPutImage = new File(outPutPath); //如果圖片不存在建立圖片 if(!outPutImage.exists()) outPutImage.createNewFile(); //5、將二維碼寫入圖片 ImageIO.write(image, imageType, outPutImage); } catch (WriterException e) { e.printStackTrace(); System.out.println("二維碼生成失敗"); } catch (IOException e) { e.printStackTrace(); System.out.println("生成二維碼圖片失敗"); } } /** * 二維碼解析 * @param analyzePath 二維碼路徑 * @return * @throws IOException */ @SuppressWarnings({ "rawtypes", "unchecked" }) public static String zxingCodeAnalyze(String analyzePath) throws Exception{ MultiFormatReader formatReader = new MultiFormatReader(); String resultStr = null; try { File file = new File(analyzePath); if (!file.exists()) { return "二維碼不存在"; } BufferedImage image = ImageIO.read(file); LuminanceSource source = new BufferedImageLuminanceSource(image); Binarizer binarizer = new HybridBinarizer(source); BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer); Map hints = new HashMap(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); Result result = formatReader.decode(binaryBitmap, hints); resultStr = result.getText(); } catch (NotFoundException e) { e.printStackTrace(); } System.out.println(resultStr); return resultStr; } }