1.导入jar包，如果是非maven工程就去mvnrepository.com搜索zxing，下载本jar包即可
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>2.写上下面代码即可，可创建一个main方法来测试，下面标识出来了对应的包
import com.google.zxing.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
public class GenerateQRCode {
public static void main(String[] args) {
readQRCode();
}
public static void readQRCode(){
MultiFormatReader formatReader = new MultiFormatReader();
File file = new File("c:/code/img.png");
try {
Map map = new HashMap();
map.put(EncodeHintType.CHARACTER_SET,"utf-8");
BufferedImage image = ImageIO.read(file);
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
Result decode = formatReader.decode(binaryBitmap,map);
System.err.println(decode.toString());
System.err.println(decode.getBarcodeFormat());
} catch (Exception e) {
e.printStackTrace();
}
}
}运行main方法即可运行！
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