Java 二维码生成工具类-工具盒子

首先导入maven依赖，这里使用的是google的一个多种格式的1D/2D条码图像处理库zxing

<!--二维码生成-->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>

然后写一个BufferedImageLuminanceSource 类

package xyz.guqing.demo.util;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import com.google.zxing.LuminanceSource;
public class BufferedImageLuminanceSource extends LuminanceSource {
private final BufferedImage image;
private final int left;
private final int top;
public BufferedImageLuminanceSource(BufferedImage image) {
    this(image, 0, 0, image.getWidth(), image.getHeight());
}

public BufferedImageLuminanceSource(BufferedImage image, int left,
                                    int top, int width, int height) {
    super(width, height);

    int sourceWidth = image.getWidth();
    int sourceHeight = image.getHeight();
    if (left + width &amp;gt; sourceWidth || top + height &amp;gt; sourceHeight) {
        throw new IllegalArgumentException(
                &quot;Crop rectangle does not fit within image data.&quot;);
    }

    for (int y = top; y &amp;lt; top + height; y++) {
        for (int x = left; x &amp;lt; left + width; x++) {
            if ((image.getRGB(x, y) &amp;amp; 0xFF000000) == 0) {
                image.setRGB(x, y, 0xFFFFFFFF); // = white
            }
        }
    }

    this.image = new BufferedImage(sourceWidth, sourceHeight,
            BufferedImage.TYPE_BYTE_GRAY);
    this.image.getGraphics().drawImage(image, 0, 0, null);
    this.left = left;
    this.top = top;
}


public byte[] getRow(int y, byte[] row) {
    if (y &amp;lt; 0 || y &amp;gt;= getHeight()) {
        throw new IllegalArgumentException(
                &quot;Requested row is outside the image: &quot; + y);
    }
    int width = getWidth();
    if (row == null || row.length &amp;lt; width) {
        row = new byte[width];
    }
    image.getRaster().getDataElements(left, top + y, width, 1, row);
    return row;
}


public byte[] getMatrix() {
    int width = getWidth();
    int height = getHeight();
    int area = width * height;
    byte[] matrix = new byte[area];
    image.getRaster().getDataElements(left, top, width, height, matrix);
    return matrix;
}


public boolean isCropSupported() {
    return true;
}


public LuminanceSource crop(int left, int top, int width, int height) {
    return new BufferedImageLuminanceSource(image, this.left + left,
            this.top + top, width, height);
}


public boolean isRotateSupported() {
    return true;
}


public LuminanceSource rotateCounterClockwise() {
    int sourceWidth = image.getWidth();
    int sourceHeight = image.getHeight();
    AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,
            0.0, 0.0, sourceWidth);
    BufferedImage rotatedImage = new BufferedImage(sourceHeight,
            sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
    Graphics2D g = rotatedImage.createGraphics();
    g.drawImage(image, transform, null);
    g.dispose();
    int width = getWidth();
    return new BufferedImageLuminanceSource(rotatedImage, top,
            sourceWidth - (left + width), getHeight(), width);
}

}

在写一个QRCodeUtil类，二维码的尺寸大小变量为QRCODE_SIZE根据自己的需要更改,宽高为QRCODE_SIZE * QRCODE_SIZE,其中encode的重载方法是将字符串编码为二维码的方法，decode的一系列重载方法则是解析二维码内容的方法

package xyz.guqing.demo.util;
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
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;
import java.util.Random;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**


二维码工具类



*/
public class QRCodeUtil {
private static final String CHARSET = &quot;utf-8&quot;;
private static final String FORMAT_NAME = &quot;JPG&quot;;
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// 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 imgPath,
                                         boolean needCompress) throws Exception {
    Hashtable&amp;lt;EncodeHintType, Object&amp;gt; hints = new Hashtable&amp;lt;EncodeHintType, Object&amp;gt;();
    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();
    BufferedImage image = new BufferedImage(width, height,
            BufferedImage.TYPE_INT_RGB);
    for (int x = 0; x &amp;lt; width; x++) {
        for (int y = 0; y &amp;lt; height; y++) {
            image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
                    : 0xFFFFFFFF);
        }
    }
    if (imgPath == null || &quot;&quot;.equals(imgPath)) {
        return image;
    }
    // 插入图片
    QRCodeUtil.insertImage(image, imgPath, needCompress);
    return image;
}

/**
 * 插入LOGO
 *
 * @param source
 *            二维码图片
 * @param imgPath
 *            LOGO图片地址
 * @param needCompress
 *            是否压缩
 * @throws Exception
 */
private static void insertImage(BufferedImage source, String imgPath,
                                boolean needCompress) throws Exception {
    File file = new File(imgPath);
    if (!file.exists()) {
        System.err.println(&quot;&quot;+imgPath+&quot;   该文件不存在！&quot;);
        return;
    }
    Image src = ImageIO.read(new File(imgPath));
    int width = src.getWidth(null);
    int height = src.getHeight(null);
    if (needCompress) { // 压缩LOGO
        if (width &amp;gt; WIDTH) {
            width = WIDTH;
        }
        if (height &amp;gt; 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);
    Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
    graph.setStroke(new BasicStroke(3f));
    graph.draw(shape);
    graph.dispose();
}

/**
 * 生成二维码(内嵌LOGO)
 *
 * @param content
 *            内容
 * @param imgPath
 *            LOGO地址
 * @param destPath
 *            存放目录
 * @param needCompress
 *            是否压缩LOGO
 * @throws Exception
 */
public static void encode(String content, String imgPath, String destPath,
                          boolean needCompress) throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content, imgPath,
            needCompress);
    mkdirs(destPath);
    String file = new Random().nextInt(99999999)+&quot;.jpg&quot;;
    ImageIO.write(image, FORMAT_NAME, new File(destPath+&quot;/&quot;+file));
}

/**
 * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
 * @author lanyuan
 * Email: mmm333zzz520@163.com
 * @date 2013-12-11 上午10:16:36
 * @param destPath 存放目录
 */
public static void mkdirs(String destPath) {
    File file =new File(destPath);
    //当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
    if (!file.exists() &amp;amp;&amp;amp; !file.isDirectory()) {
        file.mkdirs();
    }
}

/**
 * 生成二维码(内嵌LOGO)
 *
 * @param content
 *            内容
 * @param imgPath
 *            LOGO地址
 * @param destPath
 *            存储地址
 * @throws Exception
 */
public static void encode(String content, String imgPath, String destPath)
        throws Exception {
    QRCodeUtil.encode(content, imgPath, destPath, false);
}

/**
 * 生成二维码
 *
 * @param content
 *            内容
 * @param destPath
 *            存储地址
 * @param needCompress
 *            是否压缩LOGO
 * @throws Exception
 */
public static void encode(String content, String destPath,
                          boolean needCompress) throws Exception {
    QRCodeUtil.encode(content, null, destPath, needCompress);
}

/**
 * 生成二维码
 *
 * @param content
 *            内容
 * @param destPath
 *            存储地址
 * @throws Exception
 */
public static void encode(String content, String destPath) throws Exception {
    QRCodeUtil.encode(content, null, destPath, false);
}

/**
 * 生成二维码(内嵌LOGO)
 *
 * @param content
 *            内容
 * @param imgPath
 *            LOGO地址
 * @param output
 *            输出流
 * @param needCompress
 *            是否压缩LOGO
 * @throws Exception
 */
public static void encode(String content, String imgPath,
                          OutputStream output, boolean needCompress) throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content, imgPath,
            needCompress);
    ImageIO.write(image, FORMAT_NAME, output);
}

/**
 * 生成二维码
 *
 * @param content
 *            内容
 * @param output
 *            输出流
 * @throws Exception
 */
public static void encode(String content, OutputStream output)
        throws Exception {
    QRCodeUtil.encode(content, null, output, false);
}

/**
 * 解析二维码
 *
 * @param file
 *            二维码图片
 * @return
 * @throws Exception
 */
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&amp;lt;DecodeHintType, Object&amp;gt; hints = new Hashtable&amp;lt;DecodeHintType, Object&amp;gt;();
    hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
    result = new MultiFormatReader().decode(bitmap, hints);
    String resultStr = result.getText();
    return resultStr;
}

/**
 * 解析二维码
 *
 * @param path
 *            二维码图片地址
 * @return
 * @throws Exception
 */
public static String decode(String path) throws Exception {
    return QRCodeUtil.decode(new File(path));
}

}