java使用google的jar包生成二維碼圖片

使用場景

應對一些需要生成二維碼的地方,

例如:

• 二維碼超鏈接
• 二維碼支付等場景

引入jar包

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.3.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>javase</artifactId>
	<version>3.3.3</version>
</dependency>

使用方式

createQrCode(new FileOutputStream(new File(filePath)),"www.baidu.com",900,"JPEG");

• 第一個參數: 傳入文件輸出流
• 第二個參數: 傳入二維碼內容
• 第三個參數: 二維碼大小
• 第四個參數: 文件類型

源碼

package com.wang.util;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;

/**
 * @Author: WanG
 * @Date: 2019-04-16 15:14
 * @version: v1.0
 * @description: TODO
 */
public class QrCodeUtil {

/**
 * 生成包含字符串信息的二維碼圖片
 * @param outputStream 文件輸出流路徑
 * @param content 二維碼攜帶信息
 * @param qrCodeSize 二維碼圖片大小
 * @param imageFormat 二維碼的格式
 * @throws WriterException
 * @throws IOException
 */
public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{
	//設置二維碼糾錯級別ＭＡＰ
	Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
	hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矯錯級別
	QRCodeWriter qrCodeWriter = new QRCodeWriter();
	//創建比特矩陣(位矩陣)的QR碼編碼的字符串
	BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
	// 使BufferedImage勾畫QRCode  (matrixWidth 是行二維碼像素點)
	int matrixWidth = byteMatrix.getWidth();
	BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);
	image.createGraphics();
	Graphics2D graphics = (Graphics2D) image.getGraphics();
	graphics.setColor(Color.WHITE);
	graphics.fillRect(0, 0, matrixWidth, matrixWidth);
	// 使用比特矩陣畫並保存圖像
	graphics.setColor(Color.BLACK);
	for (int i = 0; i < matrixWidth; i++){
		for (int j = 0; j < matrixWidth; j++){
			if (byteMatrix.get(i, j)){
				graphics.fillRect(i-100, j-100, 1, 1);
			}
		}
	}
	return ImageIO.write(image, imageFormat, outputStream);
}

/**
 * 讀二維碼並輸出攜帶的信息
 */
public static void readQrCode(InputStream inputStream) throws IOException{
	//從輸入流中獲取字符串信息
	BufferedImage image = ImageIO.read(inputStream);
	//將圖像轉換爲二進制位圖源
	LuminanceSource source = new BufferedImageLuminanceSource(image);
	BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
	QRCodeReader reader = new QRCodeReader();
	Result result = null ;
	try {
		result = reader.decode(bitmap);
	} catch (ReaderException e) {
		e.printStackTrace();
	}
	System.out.println(result.getText());
}

/**
 * 讀取二進制文件流
 *
 * @param pdfPath 文件物理路徑
 * @return
 */
public static ByteArrayOutputStream readStream(String pdfPath) {
	return PdfUtil.readPdfStream(pdfPath);
}

/**
 * 測試代碼
 * @throws WriterException
 */
public static void main(String[] args) throws IOException, WriterException {
	String filePath = "/Users/WanG/Desktop/qrtest.jpg";
	createQrCode(new FileOutputStream(new File(filePath)),"www.baidu.com",900,"JPEG");
	readQrCode(new FileInputStream(new File(filePath)));
}
}