~随笔A004~qrcode进行二维码生成

  如今,二维码变成一种潮流。这里简单了解下二维码

  1.二维码扫描

  (1)灰度化

  (2)去燥

  (3)二值化流程

  (4)位置探测图形

  (5)译码

  (6)联网传输数据

  2.java进行二维码制作

  (1)说明:二维码背后可以是某网址的地址、有限字数的文字等。

  (2)制作逻辑:准备一个网址,将其生成二维码即可。具体实现如下图:

package com.jeecg.util.ercode;

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 java.net.URL;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

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

public class TwoDimensionCode {

	/**
	 * 生成二维码(QRCode)图片
	 * 
	 * @param content
	 *            存储内容
	 * @param imgPath
	 *            图片路径
	 */
	public void encoderQRCode(String content, String imgPath) {
		this.encoderQRCode(content, imgPath, "png", 7);
	}

	/**
	 * 生成二维码(QRCode)图片
	 * 
	 * @param content
	 *            存储内容
	 * @param output
	 *            输出流
	 */
	public void encoderQRCode(String content, OutputStream output) {
		this.encoderQRCode(content, output, "png", 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
	 */
	public void encoderQRCode(String content, String imgPath, String imgType) {
		this.encoderQRCode(content, imgPath, imgType, 10);
	}

	/**
	 * 生成带Logo的二维码(QRCode)图片
	 * 
	 * @param content
	 *            存储内容
	 * @param imgPath
	 *            图片路径
	 * @param imgType
	 *            图片类型
	 */
	public void encoderQRCode(String content, String imgPath, String imgType, String logoPath) {
		this.encoderQRCode(content, imgPath, imgType, 10, logoPath);
	}

	/**
	 * 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
	 */
	public void encoderQRCode(String content, OutputStream output, String imgType) {
		this.encoderQRCode(content, output, imgType, 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, imgType, size);
			Graphics2D g = bufImg.createGraphics();
			File imgFile = new File(imgPath);
			/* 加上Logo */
			// File logo = new File("Img/logo.png");
			File logo = new File("C:/U/a/Desktop/mm.jpg");
			// File logo = new File(logoPath);
			// 生成二维码QRCode图片
			BufferedImage logoimg = ImageIO.read(logo);
			/* 设置比列 一般Logo占比百分之二十 */
			int widthLogo = logoimg.getWidth(null) > bufImg.getWidth() * 3 / 10 ? (bufImg.getWidth() * 3 / 10)
					: logoimg.getWidth(null),
					heightLogo = logoimg.getHeight(null) > bufImg.getHeight() * 3 / 10 ? (bufImg.getHeight() * 3 / 10)
							: logoimg.getWidth(null);
			/* 设置居中 */
			int x = (bufImg.getWidth() - widthLogo) / 2;
			int y = (bufImg.getHeight() - heightLogo) / 2;
			g.drawImage(logoimg, x, y, widthLogo, heightLogo, null);
			ImageIO.write(bufImg, imgType, imgFile);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 20171130 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, String logoPath) {
		try {
			BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
			Graphics2D g = bufImg.createGraphics();
			File imgFile = new File(imgPath);

			/* 加上Logo */
			// File logo = new File(logoPath);
			// Tomcat生成二维码QRCode图片
			BufferedImage logoimg = ImageIO.read(new URL(logoPath));
			// 本地生成二维码
			// BufferedImage logoimg = ImageIO.read(new File(logoPath));

			/* 设置比列 一般Logo占比百分之二十 */
			int widthLogo = logoimg.getWidth(null) > bufImg.getWidth() * 3 / 10 ? (bufImg.getWidth() * 3 / 10)
					: logoimg.getWidth(null),
					heightLogo = logoimg.getHeight(null) > bufImg.getHeight() * 3 / 10 ? (bufImg.getHeight() * 3 / 10)
							: logoimg.getWidth(null);
			/* 设置居中 */
			int x = (bufImg.getWidth() - widthLogo) / 2;
			int y = (bufImg.getHeight() - heightLogo) / 2;
			g.drawImage(logoimg, x, y, widthLogo, heightLogo, null);
			ImageIO.write(bufImg, imgType, imgFile);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 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 = this.qRCodeCommon(content, imgType, size);
			// 生成二维码QRCode图片
			ImageIO.write(bufImg, imgType, output);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 生成二维码(QRCode)图片的公共方法
	 * 
	 * @param content
	 *            存储内容
	 * @param imgType
	 *            图片类型
	 * @param size
	 *            二维码尺寸
	 * @return
	 */
	private BufferedImage qRCodeCommon(String content, String imgType, 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
			int imgSize = 67 + 12 * (size - 1);
			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) {
				boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
				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;
	}

	/**
	 * 解析二维码(QRCode)
	 * 
	 * @param imgPath
	 *            图片路径
	 * @return
	 */
	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 TwoDimensionCodeImage(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;
	}

	/**
	 * 解析二维码(QRCode)
	 * 
	 * @param input
	 *            输入流
	 * @return
	 */
	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 TwoDimensionCodeImage(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 static void main(String[] args) {
		// String TshortURL="http://120.27.11.218:8007/a/RFreIz";
		String TshortURL = "http://120.27.11.218:8008/jeecg-master/userErftlCon.do?shortUrl=eiYnq2";
		String logoPath2 = "E:/j2eeWorkspace/jeecg-master/src/main/webapp/images/equipment.png";

		String imgPath = "F:/U/A/Desktop/user.png";
		String imgPath2 = "F:/U/A/Desktop/equipment.png";
		String logoPath = "E:/j2eeWorkspace/jeecg-master/src/main/webapp/images/user.png";

		TwoDimensionCode handler = new TwoDimensionCode();

		handler.encoderQRCode(TshortURL, imgPath, "png", logoPath);
		System.out.println("========  encoder success"); 
	}

}

  引用类:

package com.jeecg.util.ercode;

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

/*二维码图片对象*/
public class TwoDimensionCodeImage implements QRCodeImage {

	BufferedImage bufImg;

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

	@Override
	public int getHeight() {
		// TODO Auto-generated method stub
		return bufImg.getHeight();
	}

	@Override
	public int getPixel(int x, int y) {
		// TODO Auto-generated method stub
		return bufImg.getRGB(x, y);
	}

	@Override
	public int getWidth() {
		// TODO Auto-generated method stub
		return bufImg.getWidth();
	}

}

  

原文地址:https://www.cnblogs.com/gaojl/p/8404759.html