链接转化成二维码

需要的jar包：

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>

<dependency>
　　<groupId>com.google.zxing</groupId>
　　<artifactId>javase</artifactId>
　　<version>3.0.0</version>
</dependency>

java代码：

package chang1;

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.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.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
* @author Mongo
*/
public class Test3 {
    
    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 = 500;
    // LOGO宽度    
    private static final int WIDTH = 60;//中间logo大小
    // LOGO高度    
    private static final int HEIGHT = 60;  
    
    private static BufferedImage createImage(String content, String imgPath,    
            boolean needCompress) throws Exception {    
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();    
        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 < width; x++) {    
            for (int y = 0; y < height; y++) {    
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000    
                        : 0xFFFFFFFF);    
            }    
        }    
        if (imgPath == null || "".equals(imgPath)) {    
            return image;    
        }    
        // 插入图片    
        Test3.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(""+imgPath+"   该文件不存在！");    
            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 > 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);    
        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 = Test3.createImage(content, imgPath,    
                needCompress);    
        mkdirs(destPath);    
        String file = new Random().nextInt(99999999)+".jpg";    
        ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+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() && !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 {    
        Test3.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 {    
        Test3.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 {    
        Test3.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 = Test3.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 {    
        Test3.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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();    
        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 Test3.decode(new File(path));    
    }  
      
    public static void main(String[] args) throws Exception {  
        System.out.println("==开始==");
        String text = "http://www.baidu.com";
        String logoPath = "d:\金.jpg";//中间要嵌套的图片
        String destPath = "d:\";//生成的二维码存放路径
        Test3.encode(text, logoPath, destPath, true);    
//        Test3.encode(text, destPath, true);    
        System.out.println("==结束==");
    }  
}

转载至：https://suko.iteye.com/blog/2244138