生成二维码

现在办事情扫二维码很方便也很普及，java代码生成二维码：

引用对应的Service层的action层（业务管理层）：

// 引入生成二维码实现工具类的后台
import com.xxx.xxx.xxx.service.QRCodeUtil;

// 创造对象实例
private QRCodeUtil QRCodeUtil = new QRCodeUtil();

// 扫描二维码之后所要跳转的页面地址
String urlcontent ="http://service.xxx.com/xxx/weixin/Pages/Service/xxxxDetail.html?ProjectGuid="+Project.getRowguid()+"&userGuid=admin&EditM=0";

// 调用QRCodeUtil中的generateQRCodeStream生成二维码字节数组
byte[] codebyte = QRCodeUtil.generateQRCodeStream(urlcontent, 100, 100); 

// 调用QRCodeUtil中的insertImage将生成二维码图片放在固定的位置
QRCodeUtil.insertImage(codebyte, doc, "projectdetailtag");

Service层（业务逻辑层/实施层）其中所调用的二维码实现工具类的后台如下：

package com.xxx.xxxx.xxx.service;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Random;

import javax.imageio.ImageIO;

import com.aspose.words.Document;
import com.aspose.words.DocumentBuilder;
import com.xxx.xxxx.BaseService;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

@SuppressWarnings("serial")
public class QRCodeUtil extends BaseService {
    
//    public QRCodeUtil() {
//        super();
//    }
//
//    public QRCodeUtil(DataSourceConfig dataSource) {
//        super(dataSource);
//    }
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    private static final int QRCODE_SIZE = 300; // 二维码尺寸，宽度和高度均是300
    private static final int WIDTH = 80;  //LOGO宽度
    private static final int HEIGHT = 80; //LOGO高度
   
    
    /**
     *  生成二维码字节数组（字节流）
     *  @param contents
     *  @param width
     *  @param height
     *  @return
     *  @throws WriterException
     *  @throws FileNotFoundException
     *  @throws IOException    
     * @exception/throws [违例类型] [违例说明]
     * @see [类、类#方法、类#成员]
     */
    public byte[] generateQRCodeStream(String contents, int width, int height) throws WriterException, 
        FileNotFoundException, IOException{
        QRCodeWriter writer = new QRCodeWriter();
        BitMatrix matrix = writer.encode(contents, BarcodeFormat.QR_CODE, width, height);
        ByteArrayOutputStream imageStream = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(matrix, "PNG", imageStream);
        byte[] taginfo = imageStream.toByteArray();
        return taginfo;
    }
    
    /**
     *  word标签中插入二维码图片
     *  @param imageByteStream
     *  @param doc
     *  @param tag 标签名称
     */
    public void insertImage(byte[] imageByteStream, Document doc, String tag) throws IOException, Exception {
        DocumentBuilder build = new DocumentBuilder(doc);
        build.moveToBookmark(tag);
        build.insertImage(imageByteStream);
    }
    
    
    /**
     * 生成二维码的方法
     * @param content 目标url
     * @param imgPath logo图片地址
     * @param needCompress 是否压缩logo
     * @return 二维码图片
     * @throws Exception
     */
    public static BufferedImage createImage(String content, String imgPath,boolean needCompress) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//指定二维码的纠错等级为高级
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);//指定字符编码为“utf-8”
        //hints.put(EncodeHintType.MARGIN, 1); //设置图片的边距
        //参数1：内容，目标url,参数2：固定写法，参数3：二维码的宽度，参数4：二维码的高度，参数5：二维码属性设置
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        int width = bitMatrix.getWidth();//二维码的宽度
        int height = bitMatrix.getHeight();//二维码的高度
        BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);//生成的二维码image
        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)) {//logo图片地址为null或空时
            return image; //只返回二维码图片，无中间的logo
        }
        // 插入logo图片  参数1：二维码图片，参数2：logo图片地址，参数3：压缩图片
        //QRCodeUtil.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 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); //生成二维码
        mkdirs(destPath);
        String file = new Random().nextInt(99999) + ".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)
     * @param destPath 存放目录
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }
    
}