使用 HTML5 控制摄像头摄像和拍照并保存图像文件到本地和JSP上传到服务器

￡神魔★判官ぃ 2023-10-02 11:06 3阅读 0赞

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    	pageEncoding="ISO-8859-1"%>
    <!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=ISO-8859-1">
    <title>File Upload</title>
    </head>
    <body>
    
    	<video id="video" width="640" height="480" autoplay></video>
    	<button id="snap">Snap Photo</button>
    	<button id="save">Save Photo</button>
    	<canvas id="canvas" width="640" height="480"></canvas>
    
    	<form method="post" action="save.jsp">
    		<input type="hidden" name="file" id="file" /> <input type="submit"
    			id="upload" value="upload" />
    	</form>
    	<script type="text/javascript">
    		// Grab elements, create settings, etc.
    		var video = document.getElementById('video');
    
    		// Get access to the camera!
    		if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
    			// Not adding `{ audio: true }` since we only want video now
    			navigator.mediaDevices.getUserMedia({
    				video : true
    			}).then(function(stream) {
    				//video.src = window.URL.createObjectURL(stream);
    				video.srcObject = stream;
    				video.play();
    			});
    		}
    
    		/* Legacy code below: getUserMedia 
    		 else if(navigator.getUserMedia) { // Standard
    		 navigator.getUserMedia({ video: true }, function(stream) {
    		 video.src = stream;
    		 video.play();
    		 }, errBack);
    		 } else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
    		 navigator.webkitGetUserMedia({ video: true }, function(stream){
    		 video.src = window.webkitURL.createObjectURL(stream);
    		 video.play();
    		 }, errBack);
    		 } else if(navigator.mozGetUserMedia) { // Mozilla-prefixed
    		 navigator.mozGetUserMedia({ video: true }, function(stream){
    		 video.srcObject = stream;
    		 video.play();
    		 }, errBack);
    		 }
    		 */
    
    		// Elements for taking the snapshot
    		var canvas = document.getElementById('canvas');
    		var context = canvas.getContext('2d');
    		var video = document.getElementById('video');
    
    		// Trigger photo take
    		document.getElementById("snap").addEventListener("click", function() {
    			context.drawImage(video, 0, 0, 640, 480);
    		});
    
    		function saveAsLocalImage() {
    			var myCanvas = document.getElementById("canvas");
    			// here is the most important part because if you dont replace you will get a DOM 18 exception.  
    			// var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream;Content-Disposition: attachment;filename=foobar.png");  
    			var image = myCanvas.toDataURL("image/png").replace("image/png","image/octet-stream");
    			// window.location.href = image; // it will save locally  
    			// create temporary link  
    			var tmpLink = document.createElement('a');
    			tmpLink.download = 'image.png'; // set the name of the download file 
    			tmpLink.href = image;
    
    			// temporarily add link to body and initiate the download  
    			document.body.appendChild(tmpLink);
    			tmpLink.click();
    			document.body.removeChild(tmpLink);
    		}
    		function upload() {
    			var myCanvas = document.getElementById("canvas");
    			// here is the most important part because if you dont replace you will get a DOM 18 exception.  
    			// var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream;Content-Disposition: attachment;filename=foobar.png");  
    			var image = myCanvas.toDataURL("image/png");
    			// window.location.href = image; // it will save locally  
    			
    			document.getElementById('file').value = image;
    			
    		}
    
    		// Trigger photo save
    		document.getElementById("save").addEventListener("click", function() {
    			saveAsLocalImage();
    		});
    		// Trigger photo upload
    		document.getElementById("upload").addEventListener("click",function() {
    			upload();
    		});
    	</script>
    
    </body>
    </html>

<%@page import="java.io.FileOutputStream"%>
    <%@page import="java.io.IOException"%>
    <%@page import="java.io.InputStream"%>
    <%@page import="java.util.Base64"%>
    
    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    	pageEncoding="ISO-8859-1"%>
    
    
    
    
    <!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=ISO-8859-1">
    <title>Upload</title>
    </head>
    <body>
    	<%
    	FileOutputStream fos = null;
    	try {
    		String imageString = request.getParameter("file");
    		imageString = imageString.substring("data:image/png;base64,".length());
    		byte[] contentData = imageString.getBytes();
    		byte[] decodedData = Base64.getDecoder().decode(contentData);
    		String imgName = request.getServletContext().getRealPath("uploadFiles") + "\\" + String.valueOf(System.currentTimeMillis()) + ".png";
    		out.println(imgName);
    		fos = new FileOutputStream(imgName);
    		fos.write(decodedData);
    	} catch (Exception e) {
    		e.printStackTrace();
    	} finally {
    		if (fos != null) {
    			fos.close();
    		}
    	}
    	%>
    
    </body>
    </html>