二维码的生成与解析。有多种途径。我选择用大品牌,google老大的zxing。
gitHub链接是(我用的3.0.0,已经是nio了)
https://github.com/zxing/zxing/tree/zxing-3.0.0
// 其中输出图像和读取图像的类在core包 MultiFormatReader MultiFormatWriter // 生成矩阵的类在javase的包里 MatrixToImageWriter
pom.xml中的配置为
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.</modelVersion> <groupId>com.shihy</groupId>
<artifactId>qrcode</artifactId>
<version>0.0.-SNAPSHOT</version>
<packaging>jar</packaging> <name>qrcode</name>
<url>http://maven.apache.org</url> <properties>
<project.build.sourceEncoding>UTF-</project.build.sourceEncoding>
</properties> <dependencies>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.0.</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.0.</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.</version>
</dependency>
</dependencies>
</project>
生成图像与解析图像的测试工具类:
package com.polysaas.edu.qrcode; import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map; import javax.imageio.ImageIO; import org.junit.Test; import com.alibaba.fastjson.JSONObject;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
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.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer; public class QRCodeTest { /**
* 生成图像
*
* @throws WriterException
* @throws IOException
*/
@Test
public void testEncode() throws WriterException, IOException {
String filePath = "D://";
String fileName = "zxing.png";
JSONObject json = new JSONObject();
json.put(
"zxing",
"https://github.com/zxing/zxing/tree/zxing-3.0.0/javase/src/main/java/com/google/zxing");
json.put("author", "shihy");
String content = json.toJSONString();// 内容
int width = ; // 图像宽度
int height = ; // 图像高度
String format = "png";// 图像类型
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
BarcodeFormat.QR_CODE, width, height, hints);// 生成矩阵
Path path = FileSystems.getDefault().getPath(filePath, fileName);
MatrixToImageWriter.writeToPath(bitMatrix, format, path);// 输出图像
System.out.println("输出成功.");
} /**
* 解析图像
*/
@Test
public void testDecode() {
String filePath = "D://zxing.png";
BufferedImage image;
try {
image = ImageIO.read(new File(filePath));
LuminanceSource source = new BufferedImageLuminanceSource(image);
Binarizer binarizer = new HybridBinarizer(source);
BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
Result result = new MultiFormatReader().decode(binaryBitmap, hints);// 对图像进行解码
JSONObject content = JSONObject.parseObject(result.getText());
System.out.println("图片中内容: ");
System.out.println("author: " + content.getString("author"));
System.out.println("zxing: " + content.getString("zxing"));
System.out.println("图片中格式: ");
System.out.println("encode: " + result.getBarcodeFormat());
} catch (IOException e) {
e.printStackTrace();
} catch (NotFoundException e) {
e.printStackTrace();
}
}
}
测试生成图像为:
解析到的内容为:
图片中内容:
author: shihy
zxing: https://github.com/zxing/zxing/tree/zxing-3.0.0/javase/src/main/java/com/google/zxing
图片中格式:
encode: QR_CODE