/**
 * 生成二維碼
 *
 * @param contents 二維碼內(nèi)容
 * @return 二維碼的描述對(duì)象 BitMatrix
 * @throws WriterException 編碼時(shí)出錯(cuò)
 */
private BitMatrix encode(String contents) throws WriterException {
    final Map<EncodeHintType, Object> hints = new HashMap<>();
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    return new QRCodeWriter().encode(contents, BarcodeFormat.QR_CODE, 320, 320, hints);
}

BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix, new MatrixToImageConfig(Color.BLACK.getRGB(), Color.WHITE.getRGB()));

<!-- zxing生成二維碼 -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.3</version>
</dependency>

package com.pink.jucstudy.utils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
public class CodeX {
    /**
     * 1. 設(shè)置二維碼的參數(shù)
     * 2. 生成二維碼
     * 3. 將二維碼導(dǎo)出
     */
    /**
     *
     * @param content 編碼的內(nèi)容
     * @param path 本地保存的路徑
     * @return
     */
    public boolean createCode(String content,String path){
        // 1 設(shè)置基本參數(shù)
        int width = 300;
        int height = 300;
        String format = "png";//保存圖片的格式，注意：不同平臺(tái)可能有它的圖片格式要求
        // 2 設(shè)置額外參數(shù)，一定要保存到map集合中
        Map map = new HashMap();
        // 2.1 設(shè)置容錯(cuò)率
        // 其中key鍵就是EncodeHintType.ERROR_CORRECTION
        // value值也是枚舉類ErrorCorrectionLevel.M，可自行選擇容錯(cuò)率等級(jí)l>M>Q>H
        // 當(dāng)?shù)燃?jí)越高，掃描所需的時(shí)間越高，但是準(zhǔn)確率越高。
        map.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        // 2.2 生成條碼的時(shí)候使用，指定邊距，單位像素
        map.put(EncodeHintType.MARGIN,2);
        // 2.3 設(shè)置字符集
        map.put(EncodeHintType.CHARACTER_SET,"utf-8");
        // 3 生成二維碼
        // MultiFormatWriter繼承了Writer
        // 通過(guò)該對(duì)象的encode方法即可生成二維碼BitMatrix
        // 該方法形參分別對(duì)應(yīng)了：
        // 第一個(gè)參數(shù)為編碼的內(nèi)容，
        // 第二個(gè)參數(shù)選擇生成編碼為二維碼
        // 第三第四分別對(duì)應(yīng)編碼的寬度和高度
        // 第五個(gè)參數(shù)為對(duì)應(yīng)的額外參數(shù)
        // 然后需要try、catch拋出異常
        try {
            BitMatrix encode = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, map);
            // 4 導(dǎo)出到本地
            File file = new File(path);
            Path path1 = file.toPath();
            System.out.println(path1);
            MatrixToImageWriter.writeToPath(encode,format,path1);
            return true;
        } catch (WriterException | IOException e) {
            e.printStackTrace();
        }
        return false;
    }
    public static void main(String[] args) {
        boolean code = new CodeX().createCode("夏至小姐姐，留個(gè)微信唄", "E:\\xx\\2.png");
        if (code){
            System.out.println("成功");
        }else {
            System.out.println("失敗了");
        }
    }
}

    @GetMapping("/qrcode")
    public void qrcodeTest(HttpServletResponse response) throws WriterException, IOException {
        ServletOutputStream outputStream = response.getOutputStream();
        int width = 300;
        int height =300;
        String format = "png";
        HashMap<EncodeHintType, Object> map = new HashMap<>();
        map.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        map.put(EncodeHintType.CHARACTER_SET,"utf-8");
        String content = "今年是兔年，兔飛猛進(jìn)！豬兔猛進(jìn)！";
        BitMatrix encode = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, map);
        MatrixToImageWriter.writeToStream(encode,format,outputStream);
        System.out.println("成功！");
    }

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>首頁(yè)</title>
</head>
<body>
    <h5>掃碼獲取信息</h5>
    <img src="/qrcode">
</body>
</html>