Java生成微信二维码

版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/qq_27464169/article/details/89313649

一、导入pom依赖或下载QRCode.jar

<dependency>
	<groupId>QRCode</groupId>
	<artifactId>QRCode</artifactId>
	 <version>3.0</version>
</dependency> 

附录:

如何将QRCode.jar添加到本地maven仓库中?
1,下载Jar包到本地D盘,例如:D:\QRCode.jar
2,cmd 中执行mvn install 命令 格式为:
mvn install:install-file
-Dfile=<path-to-file>
-DgroupId=<group-id>
-DartifactId=<artifact-id>
-Dversion=<version>
-Dpackaging=<packaging>
例如: mvn install:install-file
-Dfile=D:\QRCode.jar
-DgroupId=QRCode
-DartifactId=QRCode
-Dversion=3.0
-Dpackaging=jar
3,在pom.xml中增加如下语句
<dependency>
<groupId>QRCode
<artifactId>QRCode
<version>3.0
</dependency>

GitHub地址
https://gitee.com/oldni/spring-boot-qrcode.git

二、二维码图片对象实现QRCodeImage接口

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

// 二维码图片对象实现QRCodeImage接口
public class QrCodeCreateImg implements QRCodeImage {

	BufferedImage bufImg;

	public QrCodeCreateImg(BufferedImage bufImg) {
		this.bufImg = bufImg;
	}

	@Override
	public int getHeight() {
		return bufImg.getHeight();
	}

	@Override
	public int getPixel(int x, int y) {
		return bufImg.getRGB(x, y);
	}

	@Override
	public int getWidth() {
		return bufImg.getWidth();
	}

}

三、生成二维码核心代码

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

import com.swetake.util.Qrcode;

public class QrCodeCreate {
	
	public static final String ImgType = "jpg";

	public static final int Size = 7;

	/**
	 * 生成二维码(QRCode)图片
	 * 
	 * @param content
	 *            存储内容
	 * @param imgPath
	 *            图片路径
	 * @param imgType
	 *            图片类型
	 * @param size
	 *            二维码尺寸
	 */
	public void encoderQRCode(String content, String imgPath, String imgType,
			int size) {
		try {
			BufferedImage bufImg = this.qRCodeCommon(content, size);
			if (bufImg != null) {
				File imgFile = new File(imgPath);
				// 生成二维码QRCode图片
				ImageIO.write(bufImg, imgType, imgFile);
			} else {
				throw new Exception("二维码生成失败:" + content);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void encoderQRCode(String content, String imgPath) {
		this.encoderQRCode(content, imgPath, ImgType, Size);
	}

	public void encoderQRCode(String content, String imgPath, String imgType) {
		this.encoderQRCode(content, imgPath, imgType, Size);
	}

	public void encoderQRCode(String content, String imgPath, int size) {
		this.encoderQRCode(content, imgPath, ImgType, size);
	}

	/**
	 * 生成二维码(QRCode)图片
	 * 
	 * @param content
	 *            存储内容
	 * @param output
	 *            输出流
	 * @param imgType
	 *            图片类型
	 * @param size
	 *            二维码尺寸
	 */
	public void encoderQRCode(String content, OutputStream output,
			String imgType, int size) {
		try {
			BufferedImage bufImg = QrCodeCreate.qRCodeCommon(content, size);
			if (bufImg != null) {
				// 生成二维码QRCode图片
				ImageIO.write(bufImg, imgType, output);
			} else {
				throw new Exception("二维码生成失败:" + content);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void encoderQRCode(String content, OutputStream output) {
		this.encoderQRCode(content, output, ImgType, Size);
	}

	public void encoderQRCode(String content, OutputStream output,
			String imgType) {
		this.encoderQRCode(content, output, imgType, Size);
	}

	public void encoderQRCode(String content, OutputStream output, int size) {
		this.encoderQRCode(content, output, ImgType, size);
	}

	public static BufferedImage qRCodeCommon(String content, int size) {
		BufferedImage bufImg = null;
		try {
			Qrcode qrcodeHandler = new Qrcode();
			// 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小
			qrcodeHandler.setQrcodeErrorCorrect('M');
			qrcodeHandler.setQrcodeEncodeMode('B');
			// 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大
			qrcodeHandler.setQrcodeVersion(size);

			// 获得内容的字节数组,设置编码格式
			byte[] contentBytes = content.getBytes("utf-8");
			// 图片尺寸
			// 原来的计算方法:int imgSize = 67 + 12 * (size - 1);
			boolean codeOut[][] = qrcodeHandler.calQrcode(contentBytes);
			int imgSize = codeOut.length * 3 + 4;

			bufImg = new BufferedImage(imgSize, imgSize,
					BufferedImage.TYPE_INT_RGB);
			Graphics2D gs = bufImg.createGraphics();
			// 设置背景颜色
			gs.setBackground(Color.WHITE);
			gs.clearRect(0, 0, imgSize, imgSize);
			// 设定图像颜色> BLACK
			gs.setColor(Color.BLACK);

			// 设置偏移量,不设置可能导致解析出错
			int pixoff = 2;
			// 输出内容> 二维码
			if (contentBytes.length > 0 && contentBytes.length < 800) {
				for (int i = 0; i < codeOut.length; i++) {
					for (int j = 0; j < codeOut.length; j++) {
						if (codeOut[j][i]) {
							gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
						}
					}
				}
			} else {
				throw new Exception("QRCode content bytes length = "
						+ contentBytes.length + " not in [0, 800].");
			}
			gs.dispose();
			bufImg.flush();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return bufImg;
	}

	public String decoderQRCode(String imgPath) {
		// QRCode 二维码图片的文件
		File imageFile = new File(imgPath);
		BufferedImage bufImg = null;
		String content = null;
		try {
			bufImg = ImageIO.read(imageFile);
			QRCodeDecoder decoder = new QRCodeDecoder();
			content = new String(decoder.decode(new QrCodeCreateImg(bufImg)),
					"utf-8");
		} catch (IOException e) {
			System.out.println("Error: " + e.getMessage());
			e.printStackTrace();
		} catch (DecodingFailedException dfe) {
			System.out.println("Error: " + dfe.getMessage());
			dfe.printStackTrace();
		}
		return content;
	}

	public String decoderQRCode(InputStream input) {
		BufferedImage bufImg = null;
		String content = null;
		try {
			bufImg = ImageIO.read(input);
			QRCodeDecoder decoder = new QRCodeDecoder();
			content = new String(decoder.decode(new QrCodeCreateImg(bufImg)),
					"utf-8");
		} catch (IOException e) {
			System.out.println("Error: " + e.getMessage());
			e.printStackTrace();
		} catch (DecodingFailedException dfe) {
			System.out.println("Error: " + dfe.getMessage());
			dfe.printStackTrace();
		}
		return content;
	}

}

四、客户端调用

public static void main(String[] args) {
		String imgPath = "C:/a1.jpg";
		String encoderContent = "https://blog.csdn.net/qq_27464169/article/details/89313649";
		QrCodeCreate handler = new QrCodeCreate();

		handler.encoderQRCode(encoderContent, imgPath);
		System.out.println("========encoder success");
		String decoderContent = handler.decoderQRCode(imgPath);
		System.out.println("解析结果如下:");
		System.out.println(decoderContent);
		System.out.println("生成二维码:" + imgPath);
		System.out.println("========decoder success!!!");
}

	

五、生成二维码图片样例
微信二维码生成样例

创作不易,写个博客不容易,希望路过的各位同胞点个赞,或者评论、关注下!你的支持是我写博客的最大动力!点个赞就行!
如果你想接点程序相关的小活(范围:400元-2000元,土豪可绕行),可以加上我的QQ号(75975175),我这边有机会向您免费提供私活资源,供您参考!

猜你喜欢

转载自blog.csdn.net/qq_27464169/article/details/89313649