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