java-dimensional code generation (available with pictures) springboot version

(June 29, 2019 fast snail blog) article

Sometimes, men and women are two completely different worlds, men and women joke joke also is totally different, totally do not understand people who love you, you do not expect a woman to know you, so men are not asking others how kind, is to ask yourself how, more men should be their own good points, take care of yourself is the most basic,

Otherwise, how do you take care of others, man is a product of competition is not it?

 

Closer to home:

First of all join my dependence is currently dependent on:

<!-- 二维码生成 -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.4.0</version>
</dependency>

first step:

1] writing tools, width, height, write here dead, I think the front desk can control, you can also modify what you want

package com.xxff.util;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;

public class QRCodeUtil {

    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;

    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入图片
        QRCodeUtil.insertImage(image, imgPath, needCompress);
        return image;
    }

    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println("" + imgPath + "   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        mkdirs(destPath);
        // String file = new Random().nextInt(99999999)+".jpg";
        // ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
        ImageIO.write(image, FORMAT_NAME, new File(destPath));
    }

    public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        return image;
    }

    public static void mkdirs(String destPath) {
        File File = new new File (destPath); 
        // When the folder does not exist, mkdirs will automatically create several directory different from the mkdir. (mkdir parent directory does not exist if an exception is thrown) 
        IF {(File.Exists () && file.isDirectory ()!!) 
            file.mkdirs (); 
        } 
    } 

    public static void encode (String Content, imgpath String, String destPath) throws Exception { 
        QRCodeUtil.encode (Content, imgpath, destPath, to false); 
    } 
    // methods are annotated 
    / * 
     * public static void encode (Content String, String destPath, Boolean 
     * needCompress) throws Exception {QRCodeUtil.encode ( Content, null, destPath, 
     * needCompress);} 
     * / 

    public static void encode (Content String, String destPath) throws Exception {
        QRCodeUtil.encode(content, null, destPath, false);
    }

    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    public static void encode(String content, OutputStream output) throws Exception {
        QRCodeUtil.encode(content, null, output, false);
    }

    public static String decode(File file) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    public static String decode(String path) throws Exception {
        return QRCodeUtil.decode(new File(path));
    }


}

Step two: Test

2] may be directly micro-channel scan test results

com.xxff.util Package; 

public class QrCodeTest { 


    public static void main (String [] args) throws Exception { 
        // the content stored in the two-dimensional code 
        String text = "I Xiaoming"; 
        // embedded two-dimensional code the image path 
        String imgPath = "C: / Users / DELL01 / Desktop / pictures / Shijie .jpg"; 
        path // generate two-dimensional code and the name of the 
        String destPath = "C: / Users / DELL01 / Desktop / pictures / jam .jpg "; 
        // generates two-dimensional code 
        QRCodeUtil.encode (text, imgpath, destPath, to true); 
        // parse dimensional code 
        String = QRCodeUtil.decode STR (destPath); 
        // print out the contents of the parsed 
        System.out .println (STR); 

    } 



}

 

The third step: controller Controller

3] controller controller

com.xxff.controller Package; 


Import com.xxff.util.QRCodeUtil; 
Import com.xxff.util.UUID; 
Import org.springframework.beans.factory.annotation.Value; 
Import org.springframework.web.bind.annotation.RequestMapping ; 
Import org.springframework.web.bind.annotation.RestController; 

Import javax.servlet.http.HttpServletResponse; 
Import java.io.File; 

/ ** 
* QR code generator that supports Chinese 
* 
* / 
@RestController 
@ RequestMapping ( "/ QRcode") 
public class QRcodeController { 
    / ** 
     * designated storage path, here is the path to your own projects disk configuration 
     * / 
    @Value (value = "$ {application.profile}") 
    Private Profile String; 
    / **
     * 1. embedded image path two-dimensional code, embedded pictures should advance into the two-dimensional code D: / xxffprofile / qrcode down / this path, 
     * and since the name qrcode.jpg 
     * 2. If the image name is null, it will generate a pure two-dimensional code 
     * / 
    String imgpath = "qrcode.jpg"; 
    path generated two-dimensional code // 
    String destPath + = Profile "qrcode /"; 

    @RequestMapping ( "/ createQRcode") 
    public String createQRcode (HttpServletResponse the Response, String Contents) throws Exception { 
             // embed pictures 
             file testFile = new new file (destPath + imgpath); 
             // destination folder 
             file filebag = new new file (destPath); 
             // folder exists, does not exist to create 
             {IF (filebag.exists ()!) 
                filebag.mkdirs (); 
             }
             QrImgPath = String ""; 
             // two-dimensional code embedded image exists and does not exist in the two-dimensional code image generated pure 
             IF (testFile.exists ()) { 
                 qrImgPath + = destPath imgpath; 
             } 
             String newName = UUID.getUUID () +. "JPG"; 
             destPath + = newName; 
             // generate two-dimensional code 
             QRCodeUtil.encode (Contents, qrImgPath, destPath, to true); 
             String rpath = "qrcode /" + newName; 
             return rpath; 

    } 
} 

If you feel good, please give praise or praise, respect for hard work to write the text, not easily reproduced ~ ~ ~ Thank you!