springMVC生成二维码

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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

 1     private static final Log logger = LogFactory.getLog(RqCodeController.class); 2  3     @RequestMapping("/gen.json") 4     public void gen(String url, HttpServletResponse response, Integer width, Integer height ) { 5          6         try { 7  8             int iWidth = (width == null?200: width); 9             int iHeight = (height==null?200: height);10             11             MatrixToImageWriter.createRqCode(url, iWidth, iHeight12                     , response.getOutputStream());13         14         } catch (Exception e) {15 16             logger.error(String.format("生成二维码失败： url： %s", url), e);17             18         }19         20         21     }

2，MatrixToImageWriter类的方法

 1 package com.web.util; 2  3 import java.awt.Graphics2D; 4 import java.awt.Image; 5 import java.awt.image.BufferedImage; 6 import java.io.File; 7 import java.io.IOException; 8 import java.io.OutputStream; 9 import java.util.Hashtable;10 11 import javax.imageio.ImageIO;12 13 import org.springframework.core.io.ClassPathResource;14 15 import com.google.zxing.BarcodeFormat;16 import com.google.zxing.EncodeHintType;17 import com.google.zxing.MultiFormatWriter;18 import com.google.zxing.WriterException;19 import com.google.zxing.common.BitMatrix;20 21 /**22  * 二维码生成工具23  */24 public class MatrixToImageWriter {25 26     private static final int BLACK = 0xFF000000;27     private static final int WHITE = 0xFFFFFFFF;28     private static final int MARGIN = 1; //边框29     30     private static final String FORMAT = "png";31 32     private MatrixToImageWriter() {33     }34 35     public static void createRqCode(String textOrUrl, int width, int height, OutputStream toStream)36             throws WriterException, IOException {37 38         Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();39         hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 内容所使用字符集编码40         hints.put(EncodeHintType.MARGIN, new Integer(MARGIN));41 42         BitMatrix bitMatrix = new MultiFormatWriter().encode(textOrUrl, BarcodeFormat.QR_CODE, width, height, hints);43 44         BufferedImage image = toBufferedImage(bitMatrix);45         applyLogo(image);//应用LOGO46 47         writeToStream(image, FORMAT, toStream);48 49     }50 51     private static void applyLogo(BufferedImage image) throws IOException {52 53         Graphics2D gs = image.createGraphics();54 55         ClassPathResource resource = new ClassPathResource("logo.png");//logo图片56         57         // 载入logo58         Image img = ImageIO.read(resource.getFile());59 60         int left = image.getWidth() / 2 - img.getWidth(null) / 2;61         int top = image.getHeight() / 2 - img.getHeight(null) / 2;62 63         gs.drawImage(img, left, top, null);64         gs.dispose();65         img.flush();66 67     }68 69     private static BufferedImage toBufferedImage(BitMatrix matrix) {70         int width = matrix.getWidth();71         int height = matrix.getHeight();72         BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);73         for (int x = 0; x < width; x++) {74             for (int y = 0; y < height; y++) {75                 image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);76             }77         }78         return image;79     }80 81     public static void writeToFile(BufferedImage image, String format, File file) throws IOException {82         83         if (!ImageIO.write(image, format, file)) {84             throw new IOException("Could not write an image of format " + format + " to " + file);85         }86     }87 88     public static void writeToStream(BufferedImage image, String format, OutputStream stream) throws IOException {89         if (!ImageIO.write(image, format, stream)) {90             throw new IOException("Could not write an image of format " + format);91         }92     }93 94 }

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

 1 /*获取页面二维码*/ 2 function share2dImg(link){ 3     $("#shareImg").attr("src","/rqcode/gen.json?url="+link+"&width=200&height=200")      4 } 5  6 $(function(){ 7  8     /*微信分享的执行*/ 9     var invitationCode = ajaxGetInfo();//不管登录与否，都传空，获取邀请码10     var shareTitle = "送有8888元！";//分享的标题11     var shareDesc = "送有8888元！";//分享的描述12     var shareLink = "https://www.baidu.com/index.php?tn=monline_3_dg";//分享的链接13     weixinShare(shareTitle,shareDesc,shareLink);14 15     //点击立即邀请，弹出界面框16     $("#toInvite").click(function(){17         $(".share-dialog").show();18     });19 20     //点击弹出界面框，回到基本页面21     $(".share-dialog").click(function(){22         $(this).hide();23     });24 25     share2dImg(encodeURIComponent(shareLink))//获取分享出去的二维码    26 27 });

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

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