<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.pdool.demo;
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
 
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
 
 
/**
 * 二維碼生成工具
 * </pre>
 */
public class MatrixToImageWriter {
 
 
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;
 
    private MatrixToImageWriter() {
    }
 
    /**
     * 根據二維矩陣的碎片 生成對應的二維碼圖像緩沖
     *
     * @param matrix 二維矩陣的碎片 包含 寬高 行，字節(jié)
     * @return 二維碼圖像緩沖
     * @see BitMatrix
     */
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }
 
 
    /**
     * 二維碼生成文件
     *
     * @param matrix 二維矩陣的碎片 包含 寬高 行，字節(jié)
     * @param format 格式
     * @param file   保持的文件地址
     * @throws IOException 文件保存異常
     */
    public static void writeToFile(BitMatrix matrix, String format, File file)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format " + format + " to " + file);
        }
    }
 
 
    /**
     * 二維碼生成流
     *
     * @param matrix 二維矩陣的碎片 包含 寬高 行，字節(jié)
     * @param format 格式
     * @param stream 保持的文件輸出流
     * @throws IOException 文件保存異常
     */
    public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }
 
 
    /**
     * 二維碼信息寫成JPG文件
     *
     * @param content 二維碼信息
     * @param fileUrl 文件地址
     */
    public static void writeInfoToJpgFile(String content, String fileUrl) {
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        Map hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        try {
            BitMatrix bitMatrix = multiFormatWriter.encode(content,
                    BarcodeFormat.QR_CODE, 250, 250, hints);
            File file1 = new File(fileUrl);
            MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
 
 
    /**
     * 二維碼信息寫成JPG BufferedImage
     *
     * @param content 二維碼信息
     * @return JPG BufferedImage
     */
    public static BufferedImage writeInfoToJpgBuff(String content) {
        BufferedImage re = null;
 
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        Map hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        try {
            BitMatrix bitMatrix = multiFormatWriter.encode(content,
                    BarcodeFormat.QR_CODE, 250, 250, hints);
            re = MatrixToImageWriter.toBufferedImage(bitMatrix);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
 
        return re;
    }
 
    public static void main(String[] args) throws IOException {
 
    }
 
}

public static void main(String[] args) throws IOException {  
    writeInfoToJpgFile("關注我公眾號：程序這點事","E:\\work\\test.jpg");  
}