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