Android 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