使用zxing生成二维码的轮子。。

今天无意间接触到二维码生成了，这个日常如此常见的东西，怎么能不了解一下呢？所以我就找了一篇zxing的博客，然后找到了一个轮子，这里就收下啦~
原文地址：RexFang的zxing轮子
另外参考了：这篇文章

工具类FileUtil.java

package com.yubotao;

import org.apache.commons.lang3.StringUtils;
import java.io.File;

/**
 * @Auther: yubt
 * @Description:
 * @Date: Created in 11:28 2018/5/31
 * @Modified By:
 */
public class FileUtil {
    public static void mkdirs(String dir){
        if (StringUtils.isEmpty(dir)){
            return;
        }

        File file = new File(dir);
        if (file.isDirectory()){
            return;
        }else {
            file.mkdir();
        }
    }
}

主体工作类QRCodeUtil.java

package com.yubotao;

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.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

/**
 * @Auther: yubt
 * @Description:
 * @Date: Created in 11:30 2018/5/31
 * @Modified By:
 */
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 = 200;
    // 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 logoImgPath, boolean needCompress) throws WriterException, IOException{
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        // 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 内容所使用字符集编码
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        //设置二维码边的空度，非负数
        hints.put(EncodeHintType.MARGIN, 1);
        /** content,要编码的内容;
         *  编码类型，目前zxing支持：Aztec 2D,CODABAR 1D format,Code 39 1D,Code 93 1D ,Code 128 1D,
         *   Data Matrix 2D , EAN-8 1D,EAN-13 1D,ITF (Interleaved Two of Five) 1D,
         *   MaxiCode 2D barcode,PDF417,QR Code 2D,RSS 14,RSS EXPANDED,UPC-A 1D,UPC-E 1D,UPC/EAN extension,UPC_EAN_EXTENSION
         *   hints,生成条形码时的一些配置,此项可选
         **/
        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++){
                // 图案背景色：0xFF000000，BLACK；0xFFFFFFFF，WHITE。
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (logoImgPath == null || "".equals(logoImgPath)){
            return image;
        }

        // 插入图片
        QRCodeUtil.insertImage(image, logoImgPath, needCompress);
        return image;
    }

    private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException {
        File file = new File(logoImgPath);
        if (!file.exists()){
            return;
        }

        Image src = ImageIO.read(new File(logoImgPath));
        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);
        //指定弧度的圆角矩形
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        // 设置笔画对象
        graph.setStroke(new BasicStroke(3f));
        // 绘制圆弧矩形
        graph.draw(shape);
        graph.dispose();
    }

    // 生成带Logo的二维码
    public static void encode(String content, String logoImgPath, String destPath, boolean needCompress) throws Exception{
        BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress);
        FileUtil.mkdirs(destPath);
        ImageIO.write(image, FORMAT_NAME, new File(destPath));
    }

    // 生成不带Logo的二维码
    public static void encode(String content, String destPath) throws Exception {
        QRCodeUtil.encode(content, null, destPath, false);
    }

    // 生成带Logo的二维码，并输出到指定输出流
    public static void encode(String content, String logoImgPath, OutputStream output, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    // 生成不带Logo的二维码，并输出到指定输出流
    public static void encode(String content, OutputStream output) throws Exception {
        QRCodeUtil.encode(content, null, output, false);
    }

    // 二维码解析
    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<DecodeHintType, Object> hints = new Hashtable<>();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    // 二维码解析
    public static String decode(String path) throws Exception {
        return QRCodeUtil.decode(new File(path));
    }

}

测试类QRCodeUtilTest.java

package com.yubotao;

import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

/**
 * @Auther: yubt
 * @Description:
 * @Date: Created in 15:03 2018/5/31
 * @Modified By:
 */
public class QRCodeUtilTest {

    @Before
    public void setUp() throws Exception{}

    @Test
    public void testEncode()throws FileNotFoundException, Exception {
        String dir = "F:/test/QRCode/test.jpg";
        String content = "Love you~";
        String logoImgPath = "F:/test/QRCode/logo.jpg";
        File file = new File(dir);
        QRCodeUtil.encode(content, logoImgPath, new FileOutputStream(file),true);
    }

}

注意dir，也就是接收输出流的文件，格式为.jpg，之前测试的时候用了.txt，就是一堆乱码了。。。