java实现电脑端扫描二维码

java实现电脑端扫描二维码

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));

finTTSHMEFal 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);

%>

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);

%>

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