python调用zxing项目进行二维码

摘要：首先创建一个java的maven项目，加入zxing相关包，编写二维码相关代码，调试运行，打包；然后创建一个python项目，安装jpype，编写代码把相关的jar包加载，运行。

0. 创建一个maven项目

1. 配置pom.xml文件

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.0</version>
        </dependency>

        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.0.0</version>
        </dependency>

         <dependency>  
            <groupId>com.alibaba</groupId>  
            <artifactId>fastjson</artifactId>  
            <version>1.1.29</version>  
        </dependency> 

2. 生成与识别二维码###

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 com.alibaba.fastjson.JSONObject;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
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 QRCode {

    public static void main(String[] args) {
        QRCode qrcode = new QRCode();
        // 内容
        JSONObject json = new JSONObject();
        json.put("blog", "http://blog.csdn.net/ld326");
        json.put("author", "happyprince");
        String content = json.toJSONString();
        // 生成二维码
        qrcode.EncodeQR("D:\\info-qr.png", content, 200, 200, "png");
        // 解释二维码
        boolean b = qrcode.DecodeQR("D:\\info-qr.png");
        if (b) {
            System.out.println("解釋出來是二維碼！！！");
        }

    }

    
    public void EncodeQR(String filePath, String content, int width,
            int height, String format) {
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        try {
            // 生成矩阵
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
                    BarcodeFormat.QR_CODE, width, height, hints);
            // 输出图像
            Path path = FileSystems.getDefault().getPath(filePath);
            System.out.println(path);
            MatrixToImageWriter.writeToPath(bitMatrix, format, path);
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("生成二维码成功.");
    }

    
    public boolean DecodeQR(String filePath) {
        boolean b = false;
        try {
            // 读入图片,转化成位图
            BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
                    new BufferedImageLuminanceSource(ImageIO.read(new File(
                            filePath)))));

            // 设置额外的一些信息，例如读取入来的提示信息
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");

            // 对图像进行解码
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);
            // 打印信息
            // sb.append("content：  " + result.getText() + " ");
            // sb.append("format：  " + result.getBarcodeFormat() + " ");
            b = true;
        } catch (IOException e) {
            // sb.append(e + " " + "filePath=" + filePath);
            e.printStackTrace();

        } catch (NotFoundException e) {
            // sb.append(e + " " + "filePath=" + filePath);
            e.printStackTrace();
        }
        return b;
    }
}

3. 打包

生成qrcode包，命名为qrcode-1.0.0.jar；再把maven下载的两个包（javase-3.0.0.jar，core-3.3.0.jar）与这个包放在一起，一会会把这些包加载到jvm中运行。

4. 安装jpype

目前配置的是win7,下载地址：http://www.lfd.uci.edu/~gohlke/pythonlibs/#jpype

5. 创建python项目

编写python代码

# -*- coding: utf-8 -*-
import logging

from jpype import *

from common.globalVars import JAR_PATH

@singleton
class QRCode:
    """
        判断图片是否QR图片
    """

    def __init__(self):
        logging.info('starJVM..')
        startJVM(getDefaultJVMPath(), "-ea", "-Djava.class.path=%s;%s;%s" % (
            JAR_PATH + 'core-3.3.0.jar',
            JAR_PATH + 'javase-3.0.0.jar',
            JAR_PATH + 'qrcode-1.0.0.jar'
        ))
        QRCode = JClass("com.lr.jpype.jpype.QRCode")
        self.qr = QRCode()

    def is_qrcode(self, file_name):
        b = self.qr.DecodeQR(file_name)
        return b
    def __del__(self):
        shutdownJVM()
        logging.info('shutdownJVM..')
qrc = QRCode()
print(qrc.is_qrcode('d:/1.jpg'))

其中装饰类，为了完成单例的功能

import logging
def singleton(cls):
    instances = {}
    def wrapper(*args, **kwargs):
        if cls not in instances:
            instances[cls] = cls(*args, **kwargs)
        return instances[cls]
    logging.info('singleton size %d' % (len(instances)))
    return wrapper

总结，这个主要是python依靠jpype，jpype运行JVM，JVM调用相关的包处理QR，主要实现的包为google的zxing。

[happyprince, http://blog.csdn.net/ld326/article/details/78671099]