java生成二维码

1.引入maven坐标

        <!--二维码生成-->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>${zxing-version}</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>${zxing-version}</version>
        </dependency>

2.编写工具类

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.deaon.common.util.keygen.IdGeneratorUtil;
import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtils {
    private static final String CHARSET = "utf-8";
    // 图片宽度的一半
    private static final int IMAGE_WIDTH = 40;
    private static final int IMAGE_HEIGHT = 40;
    private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
    private static final int FRAME_WIDTH = 2;
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // 二维码写码器
    private static MultiFormatWriter mutiWriter = new MultiFormatWriter();

    public static String encode(String content,
                                InputStream srcImagePath, String destImagePath) throws WriterException {
        Hashtable<EncodeHintType, Object> 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();
        try {
            String file = IdGeneratorUtil.createId() +".jpg";
            //生成图片文件
            ImageIO.write(genBarcode(content, width, height, srcImagePath),
                    "jpg", new File(destImagePath+"/"+file));
            return file;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }

    private static BufferedImage genBarcode(String content, int width,
                                            int height, InputStream srcImagePath) throws WriterException,
            IOException, WriterException {
        // 读取源图像
        BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH,
                IMAGE_HEIGHT, true);
        int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
        for (int i = 0; i < scaleImage.getWidth(); i++) {
            for (int j = 0; j < scaleImage.getHeight(); j++) {
                srcPixels[i][j] = scaleImage.getRGB(i, j);//图片的像素点
            }
        }
        //编码
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 生成二维码
        BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, hints);

        // 二维矩阵转为一维像素数组
        int halfW = matrix.getWidth() / 2;
        int halfH = matrix.getHeight() / 2;
        int[] pixels = new int[width * height];

        for (int y = 0; y < matrix.getHeight(); y++) {
            for (int x = 0; x < matrix.getWidth(); x++) {
                // 左上角颜色,根据自己需要调整颜色范围和颜色
                if (x > 0 && x < 100 && y > 0 && y < 100) {
                    Color color = new Color(231, 144, 56);
                    int colorInt = color.getRGB();
                    pixels[y * width + x] = matrix.get(x, y) ? colorInt
                            : 16777215;
                }
                // 读取图片
                else if (x > halfW - IMAGE_HALF_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH
                        && y < halfH + IMAGE_HALF_WIDTH) {
                    pixels[y * width + x] = srcPixels[x - halfW
                            + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
                }
                // 在图片四周形成边框
                else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        - IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
                    pixels[y * width + x] = 0xfffffff;
                } else {
                    // 二维码颜色（RGB）
                    int num1 = (int) (50 - (50.0 - 13.0) / matrix.getHeight()
                            * (y + 1));
                    int num2 = (int) (165 - (165.0 - 72.0) / matrix.getHeight()
                            * (y + 1));
                    int num3 = (int) (162 - (162.0 - 107.0)
                            / matrix.getHeight() * (y + 1));
                    Color color = new Color(num1, num2, num3);
                    int colorInt = color.getRGB();
                    // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
                    pixels[y * width + x] = matrix.get(x, y) ? colorInt
                            : 16777215;// 0x000000:0xffffff
                }
            }
        }
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        image.getRaster().setDataElements(0, 0, width, height, pixels);
        return image;
    }
    /**
     * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标
     *
     * @param srcImageFile
     *            源文件地址
     * @param height
     *            目标高度
     * @param width
     *            目标宽度
     * @param hasFiller
     *            比例不对时是否需要补白：true为补白; false为不补白;
     * @throws IOException
     */
    private static BufferedImage scale(InputStream srcImageFile, int height,
                                       int width, boolean hasFiller) throws IOException {
        double ratio = 0.0; // 缩放比例
        //File file = srcImageFile;
        BufferedImage srcImage = ImageIO.read(srcImageFile);
        Image destImage = srcImage.getScaledInstance(width, height,
                BufferedImage.SCALE_SMOOTH);
        // 计算比例
        if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
            if (srcImage.getHeight() > srcImage.getWidth()) {
                ratio = (new Integer(height)).doubleValue()
                        / srcImage.getHeight();
            } else {
                ratio = (new Integer(width)).doubleValue()
                        / srcImage.getWidth();
            }
            AffineTransformOp op = new AffineTransformOp(
                    AffineTransform.getScaleInstance(ratio, ratio), null);
            destImage = op.filter(srcImage, null);
        }
        if (hasFiller) {// 补白
            BufferedImage image = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D graphic = image.createGraphics();
            graphic.setColor(Color.white);
            graphic.fillRect(0, 0, width, height);
            if (width == destImage.getWidth(null))
                graphic.drawImage(destImage, 0,
                        (height - destImage.getHeight(null)) / 2,
                        destImage.getWidth(null), destImage.getHeight(null),
                        Color.white, null);//画图片
            else
                graphic.drawImage(destImage,
                        (width - destImage.getWidth(null)) / 2, 0,
                        destImage.getWidth(null), destImage.getHeight(null),
                        Color.white, null);
            graphic.dispose();
            destImage = image;
        }
        return (BufferedImage) destImage;
    }



    public static void main(String[] args) throws Exception {
       /* InputStream url = getClass().getClassLoader().getResourceAsStream("logo/logo.png");
        //本地生成二维码图片
        String file = QRCodeUtils.encode(newsLink + "?origin=1&user=" + encryptHex, url,destPath);*/

    }
}