// 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  

<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>  

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();

        }

    }

}  

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