java springMVC生成二维码

Zxing是Google提供的工具，提供了二维码的生成与解析的方法，现在使用Java利用Zxing生成二维码

1），二维码的生成

将Zxing-core.jar 包加入到classpath下。

我的下载地址：http://i.cnblogs.com/Files.aspx 下zxing.zip包

1.RqCodeController 类

    private static final Log logger = LogFactory.getLog(RqCodeController.class);

    @RequestMapping("/gen.json")
    public void gen(String url, HttpServletResponse response, Integer width, Integer height ) {
        
        try {

            int iWidth = (width == null?200: width);
            int iHeight = (height==null?200: height);
            
            MatrixToImageWriter.createRqCode(url, iWidth, iHeight
                    , response.getOutputStream());
        
        } catch (Exception e) {

            logger.error(String.format("生成二维码失败： url： %s", url), e);
            
        }
        
        
    }

2，MatrixToImageWriter类的方法

package com.web.util;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import org.springframework.core.io.ClassPathResource;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

/**
 * 二维码生成工具
 */
public class MatrixToImageWriter {

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;
    private static final int MARGIN = 1; //边框
    
    private static final String FORMAT = "png";

    private MatrixToImageWriter() {
    }

    public static void createRqCode(String textOrUrl, int width, int height, OutputStream toStream)
            throws WriterException, IOException {

        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 内容所使用字符集编码
        hints.put(EncodeHintType.MARGIN, new Integer(MARGIN));

        BitMatrix bitMatrix = new MultiFormatWriter().encode(textOrUrl, BarcodeFormat.QR_CODE, width, height, hints);

        BufferedImage image = toBufferedImage(bitMatrix);
        applyLogo(image);//应用LOGO

        writeToStream(image, FORMAT, toStream);

    }

    private static void applyLogo(BufferedImage image) throws IOException {

        Graphics2D gs = image.createGraphics();

        ClassPathResource resource = new ClassPathResource("logo.png");//logo图片
        
        // 载入logo
        Image img = ImageIO.read(resource.getFile());

        int left = image.getWidth() / 2 - img.getWidth(null) / 2;
        int top = image.getHeight() / 2 - img.getHeight(null) / 2;

        gs.drawImage(img, left, top, null);
        gs.dispose();
        img.flush();

    }

    private static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }

    public static void writeToFile(BufferedImage image, String format, File file) throws IOException {
        
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format " + format + " to " + file);
        }
    }

    public static void writeToStream(BufferedImage image, String format, OutputStream stream) throws IOException {
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }

}

上述编写的代码，就可传出一个二进制数，然后前端使用图片的格式将二进制数展现出来，就是一个二维码。

下面是页面生成，可以是链接，可以是文本

/*获取页面二维码*/
function share2dImg(link){
    $("#shareImg").attr("src","/rqcode/gen.json?url="+link+"&width=200&height=200")     
}

$(function(){

    /*微信分享的执行*/
    var invitationCode = ajaxGetInfo();//不管登录与否，都传空，获取邀请码
    var shareTitle = "送有8888元！";//分享的标题
    var shareDesc = "送有8888元！";//分享的描述
    var shareLink = "https://www.baidu.com/index.php?tn=monline_3_dg";//分享的链接
    weixinShare(shareTitle,shareDesc,shareLink);

    //点击立即邀请，弹出界面框
    $("#toInvite").click(function(){
        $(".share-dialog").show();
    });

    //点击弹出界面框，回到基本页面
    $(".share-dialog").click(function(){
        $(this).hide();
    });

    share2dImg(encodeURIComponent(shareLink))//获取分享出去的二维码    

});

对于二维码的解析，需要zxing一个辅助类（ BufferedImageLuminanceSource），可以直接用。

偶遇晨光原创

2016-02-25