zxing实现二维码生成和解析

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>4.0.0</modelVersion>

    <groupId>com.shihy</groupId>
    <artifactId>qrcode</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>qrcode</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.0.0</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.29</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 = 200; // 图像宽度
        int height = 200; // 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