java 二维码生成（可带图片）springboot版

本文（2019年6月29日 飞快的蜗牛博客）

有时候，男人和女人是两个完全不同的世界，男人的玩笑和女人的玩笑也完全是两码事，爱的人完全不了解你，你也不要指望一个女人了解你，所以男的不是要求别人怎么样，是要求自己怎么样，男人更应该对自己好点，照顾好自己是最基本的，

不然你怎么照顾别人，男人是竞争的产物不是吗？

言归正传：

首先加入依赖我的目前依赖是：

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

第一步：

1】写工具类，宽度，高度这里写死的，我是觉得前台可控制，你自己也可以修改自己想要的

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 File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

    public static void encode(String content, String imgPath, String destPath) throws Exception {
        QRCodeUtil.encode(content, imgPath, destPath, false);
    }
    // 被注释的方法
    /*
     * public static void encode(String content, String destPath, boolean
     * needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath,
     * needCompress); }
     */

    public static void encode(String content, 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));
    }

}

第二步：测试

2】可直接微信扫描结果测试

package com.xxff.util;

public class QrCodeTest {

    public static void main(String[] args) throws Exception {
        // 存放在二维码中的内容
        String text = "我是小铭";
        // 嵌入二维码的图片路径
        String imgPath = "C:/Users/DELL01/Desktop/图片/宋世杰.jpg";
        // 生成的二维码的路径及名称
        String destPath = "C:/Users/DELL01/Desktop/图片/jam.jpg";
        //生成二维码
        QRCodeUtil.encode(text, imgPath, destPath, true);
        // 解析二维码
        String str = QRCodeUtil.decode(destPath);
        // 打印出解析出的内容
        System.out.println(str);

    }

}

第三步：controller  控制器

3】controller  控制器

package com.xxff.controller;

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;

/**
 * 二维码生成器，支持中文
 *
 */
@RestController
@RequestMapping("/QRcode")
public class QRcodeController {
    /**
     * 指定存储路径，这里是你自己配置的项目磁盘路径
     */
    @Value(value="${application.profile}")
    private  String  profile;
    /**
     * 1.嵌入二维码的图片路径，要把嵌入二维码的图片提前放到D:/xxffprofile/qrcode/该路径下,
     * 并起名称为qrcode.jpg
     * 2.如果图片名称为空，那么就会生成一个纯净的二维码
     */
    String imgPath = "qrcode.jpg";
    // 生成的二维码的路径
    String destPath = profile+"qrcode/";

    @RequestMapping("/createQRcode")
    public String createQRcode(HttpServletResponse response,String contents) throws Exception{
             //嵌入图片
             File testFile = new File(destPath+imgPath);
             //目标文件夹
             File filebag = new File(destPath);
             //文件夹是否存在，不存在就创建
             if (!filebag.exists()) {
                filebag.mkdirs();
             }
             String qrImgPath = "";
             //二维码嵌入图片是否存在，不存在就生成纯净的二维码图片
             if(testFile.exists()){
                 qrImgPath = destPath+imgPath;
             }
             String newName = UUID.getUUID()+".jpg";
             destPath += newName;
             //生成二维码
             QRCodeUtil.encode(contents, qrImgPath, destPath, true);
             String rpath = "qrcode/"+newName;
             return  rpath;

    }
}

如果觉得好，请给个赞或好评，尊重写文辛苦，不轻易转载~~~多谢！