扫描识别工具Dynamic Web TWAIN使用教程：移动浏览器捕获（下）

将移动设备相机快速集成到Web应用程序中

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步骤4 首先尝试使用移动浏览器页面

此页面适用于桌面浏览器和移动浏览器，在桌面Chrome中，如下图所示：

在这里，你可以单击“Show Video（显示视频）”以在PC上使用 络摄像头，或单击“Grab Image（抓取图像）”以加载本地文件。我们将加载一个文件。

在移动浏览器中打开它（假设开发机器的IP是192.168.1.100）

http://192.168.1.100:8080/AcquireFromPCsAndMobileDevices/MobileBrowserCapture.html

界面如下所示，你可以单击“Grab Image”拍摄照片或加载本地文件

一旦加载/捕获图像

上传并点击Redirect以查看上传文件的列表。

上传的文件保存在System.getProperty（“user.dir”）指定的路径中，加上运行时用户ID。例如C:Program Fileseclipse-jee-oxygen-3a-win32-x86_64eclipseDynamsoft_Upload391008ba-aa9f-4564-a285-b44a42ec7864

可以在以下文件中更改路径。

AcquireFromPCsAndMobileDevicesWebContentWEB-INFweb.xml<context-param>    <param-name>dynamsoft_upload</param-name>    <param-value>D:\uploadedimages\</param-value></context-param>

文件将保存在 D:uploadedimages391008ba-aa9f-4564-a285-b44a42ec7864

步骤5 测试适用于桌面的页面

打开 http://localhost:8080/AcquireFromPCsAndMobileDevices/Scan/CustomScan.html > 获取图像

步骤6 添加要上传的按钮

HTML

<input type="button" value="Upload" onclick="Upload();" />

JavaScript

function Upload() {    if (DWObject) {        var strFullActionPagePath = location.href.substr(0, location.href.lastIndexOf('/') + 1) + 'upload.jsp';        DWObject.HTTPUpload(strFullActionPagePath, [DWObject.CurrentImageIndexInBuffer], EnumDWT_ImageType.IT_JPG, EnumDWT_UploadDataFormat.Binary, "test.jpg", function(){}, function(errCode, errString){ console.log(errString);});    }}

JSP

<%@  page language="java" import="java.io.*,java.util.*,org.apache.commons.fileupload.*,org.apache.commons.fileupload.disk.*,org.apache.commons.fileupload.servlet.*"%><%!%><%// Create a factory for disk-based file itemsDiskFileItemFactory factory = new DiskFileItemFactory();// Configure a repository (to ensure a secure temp location is used)ServletContext servletContext = this.getServletConfig().getServletContext();File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");factory.setRepository(repository);// Set factory constraintsfactory.setSizeThreshold(1000000000);// Sets the size threshold beyond which files are written directly to disk.// Create a new file upload handlerServletFileUpload upload = new ServletFileUpload(factory);// Set overall request size constraintupload.setSizeMax(-1);// Parse the requestList<FileItem> items = upload.parseRequest(request);// Process the uploaded itemsIterator<FileItem> iter = items.iterator();String _fields = "";String fileName = "";long sizeInBytes = 0;String path = application.getRealPath(request.getRequestURI());String dir = request.getServletContext().getInitParameter("dynamsoft_upload");dir = dir.replace("\\","/");String _temp_Name = dir + "files-uploaded-in-pc-browsers";File _fieldsTXT = new File(_temp_Name);if(!_fieldsTXT.exists()){    boolean result = _fieldsTXT.mkdirs();    System.out.println("File create result:"+result);}while (iter.hasNext()) {    FileItem item = iter.next();    // Process a regular form field    if (item.isFormField()) {    }    // Process a file upload    else {        String fieldName = item.getFieldName();        fileName = item.getName();        String contentType = item.getContentType();        boolean isInMemory = item.isInMemory();        sizeInBytes = item.getSize();        if(fileName!=null && sizeInBytes!=0){            File uploadedFile = new File(_temp_Name + "/" + fileName);            if(!uploadedFile.exists())            {                boolean result = uploadedFile.createNewFile();                System.out.println("File create result:"+result);            }            try {                item.write(uploadedFile);            }            catch (Exception e) {                e.printStackTrace();            }        }    }}%>

步骤7 添加代码以检测环境。将文件命名为common.js并将其放在WebContent/js/下

var dynamsoft = dynamsoft || {};(function () {    var ua = navigator.userAgent.toLowerCase(),        _platform = navigator.platform.toLowerCase(),        _bWin = (_platform == 'win32') || (_platform == 'win64') || (_platform == 'windows'),        _nMSIE = ua.indexOf('msie'),        _nTrident = ua.indexOf('trident'),        _nRV = ua.indexOf('rv:'),        _nEdge = ua.indexOf('edge'),        _tmp = ua.match(/version/([d.]+).*safari/),        _bSafari = _tmp !0 : !1,        _nSafari = _tmp _tmp[1] : 0,        _nFirefox = ua.indexOf('firefox'),        _bFirefox = (_nFirefox != -1),        _bEdge = _bWin && !_bFirefox && (_nEdge != -1),        _indexOfChrome = ua.indexOf('chrome'),        _bChrome = !_bEdge && (_indexOfChrome != -1),        _bIE = _bWin && !_bFirefox && !_bEdge && !_bChrome && (_nMSIE != -1 || _nTrident != -1 || _nRV != -1),        _strBrowserVersion = '',        _mainVer = 0;    var _deviceType,        bIsIpad = ua.match(/ipad/i) == "ipad",        bIsIphoneOs = ua.match(/iphone os/i) == "iphone os",        bIsMidp = ua.match(/midp/i) == "midp",        bIsUc7 = ua.match(/rv:1.2.3.4/i) == "rv:1.2.3.4",        bIsUc = ua.match(/ucweb/i) == "ucweb",        bIsAndroid = ua.match(/android/i) == "android",        bIsCE = ua.match(/windows ce/i) == "windows ce",        bIsWM = ua.match(/windows mobile/i) == "windows mobile";    if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {        _deviceType = 'phone';    } else {        _deviceType = 'pc';    }    if (_bEdge) {        _tmp = ua.slice(_nEdge + 5);        _tmp = _tmp.slice(0, _tmp.indexOf(' '));        _strBrowserVersion = _tmp;    } else if (_bChrome) {        _tmp = ua.slice(_indexOfChrome + 7);        _tmp = _tmp.slice(0, _tmp.indexOf(' '));        _strBrowserVersion = _tmp;    } else if (_bFirefox) {// FF        _tmp = ua.slice(_nFirefox + 8);        _tmp = _tmp.slice(0, _tmp.indexOf(' '));        _strBrowserVersion = _tmp;    } else if (_bIE) {        if (_nMSIE != -1) {            // 'msie'            _tmp = ua.slice(_nMSIE + 4);            _tmp = _tmp.slice(0, _tmp.indexOf(';'));            _strBrowserVersion = _tmp;        } else if (_nRV != -1) {            // 'rv:'            _tmp = ua.slice(_nRV + 3);            _tmp = _tmp.slice(0, _tmp.indexOf(';'));            _tmp = _tmp.slice(0, _tmp.indexOf(')'));            _strBrowserVersion = _tmp;        } else if (_nTrident != -1) {            // 'trident'            _tmp = ua.slice(_nTrident + 7);            _tmp = _tmp.slice(0, _tmp.indexOf(';'));            _strBrowserVersion = _tmp;        }    } else if (_bSafari) {        if (_tmp) {            _strBrowserVersion = _tmp[1];        }    }    if (_strBrowserVersion.indexOf('.') > -1)        _mainVer = _strBrowserVersion.slice(0, _strBrowserVersion.indexOf('.')) * 1.0;    dynamsoft.onlineNavInfo = {        bWin: _bWin,        bIE: _bIE,        bEdge: _bEdge,        bFirefox: _bFirefox,        bChrome: _bChrome,        bSafari: _bSafari,        strVersion: _strBrowserVersion,        mainVer: _mainVer,        deviceType: _deviceType    };})();var strHREF = window.location.href;if (dynamsoft.onlineNavInfo.deviceType == 'pc') {    if (strHREF.indexOf('CustomScan') == -1)        window.location.replace(strHREF.substr(0, strHREF.lastIndexOf('AcquireFromPCsAndMobileDevices') + 30) + '/Scan/CustomScan.html');} else {    if (strHREF.indexOf('MobileBrowserCapture') == -1)        window.location.replace(strHREF.substr(0, strHREF.lastIndexOf('AcquireFromPCsAndMobileDevices') + 30) + '/MobileBrowserCapture.html');

步骤8 使用以下代码在WebContent下创建文件index.jsp

<%@ page session="false" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8" %><!DOCTYPE html><html lang="en">    <head>        <meta charset="UTF-8" />        <title>Capture Anywhere</title>    </head>    <body>        <h1>Redirecting</h1>    </body>    <script type="text/javascript" src="js/common.js"></script></html>

在MobileBrowserCapture.html和CustomScan.html中引用common.js

<script type="text/javascript" src="js/common.js"></script><script type="text/javascript" src="../js/common.js"></script>

现在，当你导航到 http://192.168.1.100:8080/AcquireFromPCsAndMobileDevices/时，你将登陆到正在使用的浏览器的正确页面。

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标签：扫描识别图像处理扫描与图像