生成二维码（只适用于字符串)

package com.pbids.sanqin.util;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.junit.Test;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.nio.file.Path;
import java.util.Hashtable;


public class GeneratingCodeUtil {

    /**
     * 生成二维码
     * @param url
     * @param resourcePath
     * @return
     * @throws Exception
     */
    public static Path encode(String url, String resourcePath) throws Exception {
        int width = 100;
        int height = 100;
        String format = "png";
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 1);
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);
            String fileurl = resourcePath + "qrcode";

            File img = new File(fileurl);
            if (img.exists()) {

            } else {
                img.mkdir();
            }
            MatrixToImageConfig config = new MatrixToImageConfig(0, 16777215);
            fileurl += "/" + System.currentTimeMillis() + "_" + RandowUtil.genRandomNum(5) + ".png";
            Path filepath = new java.io.File(fileurl).toPath();
            MatrixToImageWriter.writeToPath(bitMatrix, format, filepath, config);
            return filepath;
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }


    public void decode() throws Exception {
        MultiFormatReader formatReader = new MultiFormatReader();
        File file = new File("D:/new.png");
        BufferedImage image = null;
        try {
            image = ImageIO.read(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        Result result = formatReader.decode(binaryBitmap, hints);
        System.err.println("解析结果：" + result.toString());
        System.out.println(result.getBarcodeFormat());
        System.out.println(result.getText());
    }

    /**
     * @return
     * @Description: 根据图片地址转换为base64编码字符串
     * @Author:
     * @CreateTime:
     */
    public static String getImageStr(String imgFile) {
        InputStream inputStream = null;
        byte[] data = null;
        try {
            inputStream = new FileInputStream(imgFile);
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 加密
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);
    }

    /**
     * @param imgStr base64编码字符串
     * @param path   图片路径-具体到文件
     * @return
     * @Description: 将base64编码字符串转换为图片
     * @Author:
     * @CreateTime:
     */
    public static boolean generateImage(String imgStr, String path) {
        if (imgStr == null) {
            return false;
        }
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            // 解密
            byte[] b = decoder.decodeBuffer(imgStr);
            // 处理数据
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            OutputStream out = new FileOutputStream(path);
            out.write(b);
            System.out.println("解码成功");
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }


   /* public static void main(String[] args) {
        String strImg = getImageStr("D:/bg.png");
        System.out.println(strImg);
        generateImage(strImg, "D:/aa/bg.png");
    }*/
}

须要导入的maven

<!--生成二维码的Jar包--><dependency>    <groupId>com.google.zxing</groupId>    <artifactId>core</artifactId>    <version>3.0.0</version></dependency><dependency>    <groupId>com.google.zxing</groupId>    <artifactId>javase</artifactId>    <version>3.0.0</version></dependency>