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！

原文地址：https://www.cnblogs.com/luojiesheng/p/11106107.html