二維碼生成器

原創

2020-02-22 07:59

一、介紹：本文爲二維碼不在服務器生成圖片直接輸出在客戶端；訪問方式可以爲img標籤中src爲“aa/getQCode?text=”;

二、二維碼生成器分爲兩種，小日本的qCord導入谷歌zxing的jar包；其中zxing的maven依賴是：

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

三、代碼部分：

        @RequestMapping(value = "getQRCoder")
	@ResponseBody
	public void getQRCoder(HttpServletResponse response,String text){
		//設置頁面不緩存
		response.setHeader("Pragma","No-cache");
		response.setHeader("Cache-Control","no-cache");
		response.setDateHeader("Expires", 0);

		int width2 = 233; 
		int height2 = 233; 
		//二維碼的圖片格式
		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); 
		//內容所使用編碼 
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE, width2, height2, hints);
			bitMatrix = deleteWhite(bitMatrix);
			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); //二維碼圖片爲黑白兩色
				} 
			}
			ImageIO.write(image,"gif",response.getOutputStream());
			//生成二維碼 
			//File outputFile = new File("d:"+File.separator+"new.gif"); 
			//MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private static BitMatrix deleteWhite(BitMatrix matrix) {
        int[] rec = matrix.getEnclosingRectangle();
        int resWidth = rec[2] + 1;
        int resHeight = rec[3] + 1;

        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
        resMatrix.clear();
        for (int i = 0; i < resWidth; i++) {
            for (int j = 0; j < resHeight; j++) {
                if (matrix.get(i + rec[0], j + rec[1]))
                    resMatrix.set(i, j);
            }
        }
        return resMatrix;
    }