简单二维码

最新推荐文章于 2025-08-11 09:20:14 发布

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最新推荐文章于 2025-08-11 09:20:14 发布

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文章标签： java python javascript ViewUI

原文链接：https://my.oschina.net/xiaomaoandhong/blog/113442

2019独角兽企业重金招聘Python工程师标准>>>

以下来自于网络：
导入 qrcodeJp.jar和 QrcodeSwetake.jar。

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>QRcode</title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
	$(function(){
		$("#sub").click(function(){
			window.location.href = "DcoderServlet?path=" + $("#img").attr("src");
		});
	});
</script>
</head>
<body>
<img alt="" id="img" src="${pageContext.request.contextPath}/EncoderServlet">
<hr/>
<label id="sub">编码内容：</label>${content }
</body>
</html>

EncoderServlet.java

/**
 * 生成二维码
 * @author yh.z
 *
 */
public class EncoderServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		Qrcode qrcode = new Qrcode();
		qrcode.setQrcodeErrorCorrect('M');
		qrcode.setQrcodeEncodeMode('B');
		qrcode.setQrcodeVersion(7);

		String content = request.getParameter("msg");
		if (content == null || "".equals(content)) {
			content = "Generate the qr code";
		}
		byte[] bstr = content.getBytes("UTF-8");
		BufferedImage bi = new BufferedImage(139, 139,
				BufferedImage.TYPE_INT_RGB);
		Graphics2D g = bi.createGraphics();
		g.setBackground(Color.WHITE); //背景颜色  
		g.clearRect(0, 0, 139, 139);
		g.setColor(Color.BLACK); //条码颜色  
		if (bstr.length > 0 && bstr.length < 123) {
			boolean[][] b = qrcode.calQrcode(bstr);
			for (int i = 0; i < b.length; i++) {
				for (int j = 0; j < b.length; j++) {
					if (b[j][i]) {
						g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3);
					}
				}
			}
		}
		g.dispose();
		bi.flush();

		response.setContentType("image/png");
		ImageIO.write(bi, "png", response.getOutputStream());
	}
}

DcoderServlet.java

/**
 * 解析二维码
 * @author yh.z
 */
public class DcoderServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String path = request.getParameter("path");
		path = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path;
		if(path == null || "".equals(path)){
			response.getWriter().write("Invalid Path!");
		}else{
			QRCodeDecoder decoder = new QRCodeDecoder();  
			BufferedImage image = null;  
			if (path.startsWith("http://")) {  
				image = ImageIO.read(new URL(path));  
			} else {  
				image = ImageIO.read(new File(path));  
			}
			String decodedString = new String(decoder.decode(new CodeImage(image)),"UTF-8");  
			decodedString = ContentConverter.convert(decodedString); 
			request.setAttribute("content", decodedString);
			request.getRequestDispatcher("index.jsp").forward(request, response);
		}
	}
}

class CodeImage implements QRCodeImage {  
	BufferedImage image;  

	public CodeImage(BufferedImage source) {  
		this.image = source;  
	}  

	public int getWidth() {  
		return image.getWidth();  
	}  

	public int getHeight() {  
		return image.getHeight();  
	}  

	public int getPixel(int x, int y) {  
		return image.getRGB(x, y);  
	}  
}

效果图：