基於谷歌com.google.zxing的二維碼工具

思路使用谷歌提供的com.google.zxing，工具類，對內容進行二維碼生成。

1.添加maven依賴

<dependency>
	    <groupId>com.google.zxing</groupId>
	    <artifactId>core</artifactId>
	    <version>3.3.0</version>
	</dependency>
	<dependency>
		<groupId>com.google.zxing</groupId>
		<artifactId>javase</artifactId>
		<version>3.3.0</version>
	</dependency>

2.編寫MyQRCodeUtil.java

package com.mmz.spring;

import java.awt.image.BufferedImage;
import java.io.File;
import java.nio.file.Path;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Random;

import javax.imageio.ImageIO;

import org.springframework.stereotype.Component;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 二維碼生成工具類
 */
@Component
public class MyQRCodeUtil {


    /**
     *	調用示例MyQRCodeUtil.createQRCodeByContent("個人小夥伴", "d://");
     * @param content 生成的內容
     * @param compressionUrl 本地臨時路徑,例如 d://
     * @return 返回臨時文件路徑
     */
    public static String createQRCodeByContent(String content,String compressionUrl){
        final int width = 500;
        final int height = 600;
        final String format = "png";
        int flag = new Random().nextInt(9999);
        if (flag < 1000)
        {
            flag += 1000;
        }


        //定義二維碼的參數
        HashMap hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 2);

        String url ="";
        //生成二維碼
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            // 先寫到本地緩存,設置一個隨機文件名
            String tempFileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + String.valueOf(flag);
            Path tempFile = new File(compressionUrl + tempFileName + ".png").toPath();
            //Path file = new File("F:/img.png").toPath();
            MatrixToImageWriter.writeToPath(bitMatrix, format, tempFile);
            url = compressionUrl + tempFileName + ".png";

        } catch (Exception e) {

        }
        return url;
    }
    
    
    public static Result parseQrCode(String path) throws Exception {
    	MultiFormatReader formatReader = new MultiFormatReader();
        File file = new File(path);
        BufferedImage image = ImageIO.read(file);
        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));

        //定義二維碼的參數
        HashMap map = new HashMap();
        map.put(EncodeHintType.CHARACTER_SET, "utf-8");

        Result result = formatReader.decode(binaryBitmap, map);

        System.out.println("二維碼解析結果：" + result.toString());
        System.out.println("二維碼的格式：" + result.getBarcodeFormat());
        System.out.println("二維碼的文本內容：" + result.getText());
		return result;
    }
    
}

3.編寫測試類 QrTest.java

package com.mmz.spring;

import com.google.zxing.Result;

public class QrTest {

	public static void main(String[] args) {
		MyQRCodeUtil.createQRCodeByContent("個人小夥伴", "d://");
		try {
			Result parseQrCode = MyQRCodeUtil.parseQrCode("d://201906240952007298.png");
			System.out.println(parseQrCode);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

//最後發現，若是生成的內容過多，解析方法會報錯com.google.zxing.NotFoundException