这篇文章主要为大家详细介绍了java实现电脑端扫描二维码，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了java实现电脑端扫描二维码的具体代码，供大家参考，具体内容如下
说明：js调去电脑摄像头拍照，然后获取图片base64位编码，再将base64为编码转为bolb，通过定时异步上传到后台，在后台对图片文件进行解码，返回解码结果到页面，然后页面重新加载结果（url）
第一种方式引入js
第二种方式引入js
后台java代码maven引入jar包
com.github.binarywang qrcode-utils 1.1 com.google.zxing core 3.3.3
后台代码处理方式：
public class EwmDescode { /** * 解析二维码 * * @param input * 二维码输入流 */ public static final String parse(InputStream input) throws Exception { Reader reader = null; BufferedImage image; try { image = ImageIO.read(input); if (image == null) { throw new Exception("cannot read image from inputstream."); } final LuminanceSource source = new BufferedImageLuminanceSource(image); final BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); final Map hints = new HashMap(); hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); // 解码设置编码方式为：utf-8， reader = new MultiFormatReader(); return reader.decode(bitmap, hints).getText(); } catch (IOException e) { e.printStackTrace(); throw new Exception("parse QR code error: ", e); } catch (ReaderException e) { e.printStackTrace(); throw new Exception("parse QR code error: ", e); } } /** * 解析二维码 * * @param url * 二维码url */ public static final String parse(URL url) throws Exception { InputStream in = null; try { in = url.openStream(); return parse(in); } catch (IOException e) { e.printStackTrace(); throw new Exception("parse QR code error: ", e); } finally { IOUtils.closeQuietly(in); } } /** * 解析二维码 * * @param file * 二维码图片文件 */ public static final String parse(File file) throws Exception { InputStream in = null; try { in = new BufferedInputStream(new FileInputStream(file)); return parse(in); } catch (FileNotFoundException e) { e.printStackTrace(); throw new Exception("parse QR code error: ", e); } finally { IOUtils.closeQuietly(in); } } /** * 解析二维码 * * @param filePath * 二维码图片文件路径 */ public static final String parse(String filePath) throws Exception { InputStream in = null; try { in = new BufferedInputStream(new FileInputStream(filePath)); return parse(in); } catch (FileNotFoundException e) { e.printStackTrace(); throw new Exception("parse QR code error: ", e); } finally { IOUtils.closeQuietly(in); } } } @RequestMapping("/decodeEwm") @ResponseBody public String decodeEwm(MultipartFile ewmImg){ String parse = null; try { parse = EwmDescode.parse(ewmImg.getInputStream()); } catch (Exception e) { //e.printStackTrace(); } String msg = "no"; if(StringUtils.isNotBlank(parse)){ return parse; } return msg; } 前台jsp代码：
第一种处理方式：
<%@ page contentType="text/html; charset=utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/resources/"; String urlPath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; request.setAttribute("path", path); request.setAttribute("basePath", basePath); request.setAttribute("urlPath", urlPath); %> webcam 第二种处理方式：
<%@ page contentType="text/html; charset=utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/resources/"; String urlPath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; request.setAttribute("path", path); request.setAttribute("basePath", basePath); request.setAttribute("urlPath", urlPath); %> QRCODE 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持html中文网。
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