Java 二维码生成解析

**Java 二维码生成解析**

二维码是一种特殊的条形码，能够容纳更多的信息，并且可以使用手机等移动设备扫描。Java 中有多个库可以用于生成和解析二维码，我们将使用最常用的 ZXing 库。

###依赖首先，我们需要在项目中添加 ZXing 库的依赖：

xml<dependency>
 <groupId>com.google.zxing</groupId>
 <artifactId>core</artifactId>
 <version>3.5.0</version>
</dependency>

javaimport com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;

import javax.imageio.ImageIO;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class QrCodeGenerator {

 public static void main(String[] args) throws IOException, FormatException {
 //生成二维码的内容 String content = " />
 // 设置二维码的格式 Map hints = new HashMap<>();
 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
 hints.put(EncodeHintType.MARGIN,1);

 //生成二维码 BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,200,200, hints);
 BufferedImage image = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(createImage(200,200)))).toGrayscale();
 Result result = new QRCodeReader(image).decode(bitMatrix);

 //保存二维码 ImageIO.write(result.getBarcode(), "png", new File("qrcode.png"));
 }

 private static BufferedImage createImage(int width, int height) {
 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
 Graphics2D graphics = image.createGraphics();
 graphics.setColor(java.awt.Color.WHITE);
 graphics.fillRect(0,0, width, height);
 return image;
 }
}

javaimport com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;

import javax.imageio.ImageIO;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class QrCodeReader {

 public static void main(String[] args) throws IOException, FormatException {
 //读取二维码图片 BufferedImage image = ImageIO.read(new File("qrcode.png"));

 // 解析二维码 LuminanceSource source = new BufferedImageLuminanceSource(image);
 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
 Map hints = new HashMap<>();
 hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
 Result result = new MultiFormatReader().decode(bitmap, hints);

 // 输出解析结果 System.out.println("二维码内容：" + result.getText());
 }
}