Java生成二维码连接

本文使用的是Goodge的zxing

添加maven依赖

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>

测试类

import com.qxgf.medical.util.EncodeImgZingLogo;

import java.io.File;

/**
 * @ClassName EncodeImgZingLogoTest
 * @Author Mr.Tang
 * @Date 2019/7/31 12:27
 * @Version 1.0
 **/
public class EncodeImgZingLogoTest {

    public static void main(String[] args) {
        String contents = "http://blog.csdn.net/typa01_kk";
        String format = "jpeg"; //***此处如果格式为"gif",则logo图片为黑色,其他格式ok
        //生成二维码
        File logoImg = new File("C:\Users\Administrator\Desktop\qxgf1.png");
        File img = new File("D:"+File.separator+"csdn.jpg");
        EncodeImgZxing.writeToFile(contents, format, img);
//      //添加logo图片
        File img1 = new File("D:"+File.separator+"csdnlogo.jpg");
        EncodeImgZingLogo.writeToFile(img, logoImg, format, img1);
    }


}
实现类
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.EnumMap;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
 * 通过google的zxing实现二维码(加入logo图片)
 * */
public final class EncodeImgZxing {
    //二维码颜色
    private static final int BLACK = 0xFF000000;//0xFFFF0000,红色
    //二维码背景色
    private static final int WHITE = 0xFFFFFFFF;//0xFF0000FF,蓝色
    //注:二维码颜色色差大,扫描快,但如果"BLACK'设置为黑色外其他颜色,可能无法扫描
    //二维码图片宽度
    private static final int width = 300;
    //二维码图片高度
    private static final int height = 300;
    //二维码格式参数
    private static final EnumMap<EncodeHintType, Object> hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
    static{
        /*二维码的纠错级别(排错率),4个级别:
         L (7%)、
         M (15%)、
         Q (25%)、
         H (30%)(最高H)
         纠错信息同样存储在二维码中,纠错级别越高,纠错信息占用的空间越多,那么能存储的有用讯息就越少;共有四级;
         选择M,扫描速度快。
         */
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 二维码边界空白大小 1,2,3,4 (4为默认,最大)
        hints.put(EncodeHintType.MARGIN, 1);
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.MAX_SIZE, 350);
        hints.put(EncodeHintType.MIN_SIZE, 150);
    }
    /**
     * 绘制二维码
     * @param contents 二维码内容
     * @return image 二维码图片
     * */
    public static BufferedImage encodeImg(String contents){
        BufferedImage image = null;
        try{
            BitMatrix matrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
            image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            int width = matrix.getWidth();
            int height = matrix.getHeight();
            for(int x = 0; x < width; x++){
                for(int y =0;y < height; y++){
                    image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
                }
            }
        }catch(Exception e){
            System.out.println("生成二维码失败"+e.getMessage());
        }
        return image;
    }

    /**
     * 二维码输出到文件
     *  @param contents 二维码内容
     * @param format 图片格式
     * @param file 输出文件
     * */
    public static void writeToFile(String contents,String format,File file){
        BufferedImage image = encodeImg(contents);
        try {
            ImageIO.write(image, format, file);
        } catch (IOException e) {
            System.out.println("二维码写入文件失败"+e.getMessage());
        }
    }
    /**
     * 二维码流式输出
     *  @param contents 二维码内容
     * @param format 图片格式
     * @param stream 输出流
     * */
    public static void writeToStream(String contents,String format,OutputStream stream){
        BufferedImage image = encodeImg(contents);
        try {
            ImageIO.write(image, format, stream);
        } catch (IOException e) {
            System.out.println("二维码写入流失败"+e.getMessage());
        }
    }
}

加入自定义logo实现类

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

import javax.imageio.ImageIO;
/**
 * 通过google的zxing实现二维码(加入logo图片)
 * */
public final class EncodeImgZingLogo {
    /**
     * 二维码绘制logo
     * @param twodimensioncodeImg 二维码图片文件
     * @param logoImg logo图片文件
     * */
    public static BufferedImage encodeImgLogo(File twodimensioncodeImg,File logoImg){
        BufferedImage twodimensioncode = null;
        try{
            if(!twodimensioncodeImg.isFile() || !logoImg.isFile()){
                System.out.println("输入非图片");
                return null;
            }
            //读取二维码图片
            twodimensioncode = ImageIO.read(twodimensioncodeImg);
            //获取画笔
            Graphics2D g = twodimensioncode.createGraphics();
            //读取logo图片
            BufferedImage logo = ImageIO.read(logoImg);
            //设置二维码大小,太大,会覆盖二维码,此处20%
            int logoWidth = logo.getWidth(null) > twodimensioncode.getWidth()*3 /10 ? (twodimensioncode.getWidth()*3 /10) : logo.getWidth(null);
            int logoHeight = logo.getHeight(null) > twodimensioncode.getHeight()*2 /10 ? (twodimensioncode.getHeight()*2 /10) : logo.getHeight(null);
            //设置logo图片放置位置
            //中心
            int x = (twodimensioncode.getWidth() - logoWidth) / 2;
            int y = (twodimensioncode.getHeight() - logoHeight) / 2;
            //右下角,15为调整值
//          int x = twodimensioncode.getWidth()  - logoWidth-15;
//          int y = twodimensioncode.getHeight() - logoHeight-15;
            //开始合并绘制图片
            g.drawImage(logo, x, y, logoWidth, logoHeight, null);
            g.drawRoundRect(x, y, logoWidth, logoHeight, 15 ,15);
            //logo边框大小
            g.setStroke(new BasicStroke(2));
            //logo边框颜色
            g.setColor(Color.WHITE);
            g.drawRect(x, y, logoWidth, logoHeight);
            g.dispose();
            logo.flush();
            twodimensioncode.flush();
        }catch(Exception e){
            System.out.println("二维码绘制logo失败");
        }
        return twodimensioncode;
    }

    /**
     * 二维码输出到文件
     * @param twodimensioncodeImg 二维码图片文件
     * @param logoImg logo图片文件
     * @param format 图片格式
     * @param file 输出文件
     * */
    public static void writeToFile(File twodimensioncodeImg,File logoImg,String format,File file){
        BufferedImage image = encodeImgLogo(twodimensioncodeImg, logoImg);
        try {
            ImageIO.write(image, format, file);
        } catch (IOException e) {
            System.out.println("二维码写入文件失败"+e.getMessage());
        }
    }
    /**
     * 二维码流式输出
     * @param twodimensioncodeImg 二维码图片文件
     * @param logoImg logo图片文件
     * @param format 图片格式
     * @param stream 输出流
     * */
    public static void writeToStream(File twodimensioncodeImg,File logoImg,String format,OutputStream stream){
        BufferedImage image = encodeImgLogo(twodimensioncodeImg, logoImg);
        try {
            ImageIO.write(image, format, stream);
        } catch (IOException e) {
            System.out.println("二维码写入流失败"+e.getMessage());
        }
    }
}

效果图:

原文地址:https://www.cnblogs.com/tangyin/p/11345368.html