java实现调用摄像头拍照
•发布于   •作者 Jencks  •734 次浏览  •最后一次编辑是   •来自 博客

       花了两个小时实现了javaWeb调用摄像投拍照功能。

        javaWeb调用摄像头拍照,有两种解决方案:一种是使用ActiveX控件调用摄像头实现拍照上传功能,这种方式只能在ie浏览器下有效,限制非常大;另一种是调用flash实现拍照功能,这篇博客就主要介绍下如果通过调用flash插件实现调用本地摄像头拍照的功能。

运行后的页面效果如下图:


html页面源码如下

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script src="http://libs.baidu.com/jquery/1.6.4/jquery.min.js"></script>
<script type="text/javascript" src="/sxt/js/jquery.webcam.min.js"></script>
<script type="text/javascript">
    $(function () {
        var w = 320, h = 240;
        var pos = 0, ctx = null, saveCB, image = [];
 
        var canvas = document.createElement("canvas");
        canvas.setAttribute('width', w);
        canvas.setAttribute('height', h);
 
        console.log(canvas.toDataURL);
        if (canvas.toDataURL) {
 
            ctx = canvas.getContext("2d");
 
            image = ctx.getImageData(0, 0, w, h);
 
            saveCB = function(data) {
 
                var col = data.split(";");
                var img = image;
 
                for(var i = 0; i < w; i++) {
                    var tmp = parseInt(col[i]);
                    img.data[pos + 0] = (tmp >> 16) & 0xff;
                    img.data[pos + 1] = (tmp >> 8) & 0xff;
                    img.data[pos + 2] = tmp & 0xff;
                    img.data[pos + 3] = 0xff;
                    pos+= 4;
                }
 
                if (pos >= 4 * w * h) {
                    ctx.putImageData(img, 0, 0);
                    /* $.post("servlet/CatD", {type: "data", image: canvas.toDataURL("image/png")}, function(msg){
                        console.log("===="+eval(msg));
                        pos = 0;
                        $("#img").attr("src", msg+"");
                    }); */
                    $.ajax({
			             type: "post",
			             url: "servlet/CatD?t="+new Date().getTime(),
			             data: {type: "pixel", image: canvas.toDataURL("image/png")},
			             dataType: "html",
			             success: function(data){
			                         console.log("===="+data);
			                        pos = 0;
			                        $("#img").attr("src", "");
			                        $("#img").attr("src", data);
			                 }
			         });
                }
            };
 
        } else {
 
            saveCB = function(data) {
                image.push(data);
 
                pos+= 4 * w;
 
                if (pos >= 4 * w * h) {
                    /* $.post("servlet/CatD", {type: "pixel", image: image.join('|')}, function(msg){
                        console.log("+++++"+eval(msg));
                        pos = 0;
                        $("#img").attr("src", msg+"");
                    }); */
                    
                     $.ajax({
			             type: "post",
			             url: "servlet/CatD",
			             data: {type: "pixel", image: image.join('|')},
			             dataType: "json",
			             success: function(data){
			                         console.log("+++++"+eval(msg));
			                        pos = 0;
			                        $("#img").attr("src", msg+"");
			                    }
			         });
                }
            };
        }
 
        $("#webcam").webcam({
            width: w,
            height: h,
            mode: "callback",
            swffile: "js/jscam_canvas_only.swf",
 
            onSave: saveCB,
 
            onCapture: function () {
                webcam.save();
            },
 
            debug: function (type, string) {
                console.log(type + ": " + string);
            }
        });
    });
 
    //拍照
    function savePhoto(){
        webcam.capture();
    }
     
    /*$(function () {
    var image = new Array();
    var w = 320, h = 240;
    var pos = 0;
    $("#webcam").webcam({
        width: w,
        height: h,
        mode: "callback",
        swffile: "${ctxStatic }/jquery-plugin/jscam_canvas_only.swf", // canvas only doesn't implement a jpeg encoder, so the file is much smaller
 
        onTick: function (remain) {
            if (0 == remain) {
                jQuery("#status").text("Cheese!");
            } else {
                jQuery("#status").text(remain + " seconds remaining...");
            }
        },
 
        onSave: function (data) {
            // Work with the picture. Picture-data is encoded as an array of arrays... Not really nice, though =/
            image.push(data);
            pos += 4 * w;
            if (pos == 4 * w * h) {
                $.post("${ctx}/common/webcam/uploadPhoto", {w: w, h: h, image: image.join('|')}, function (msg) {
                    pos = 0;
                    image = new Array();
                    $("#img").attr("src", "${ctx}/"+msg);
                });
            }
        },
 
        onCapture: function () {
            webcam.save();
            // Show a flash for example
        },
 
        debug: function (type, string) {
            // Write debug information to console.log() or a div, ...
        },
 
        onLoad: function () {
            // Page load
            var cams = webcam.getCameraList();
            for (var i in cams) {
                jQuery("#cams").append("<li>" + cams[i] + "</li>");
            }
        }
    });
});*/
</script>

<style type="text/css">
    #webcam { border: 1px solid #666666; width: 320px; height: 240px; }
    #photos { border: 1px solid #666666; width: 320px; height: 240px; }
    .btn { width: 320px; height: auto; margin: 5px 0px; }
    .btn input[type=button] { width: 150px; height: 50px; line-height: 50px; margin: 3px; }
</style>
  </head>
  
  <body>
<div id="webcam"></div>
<div class="btn">
    <input type="button" value="删除" id="delBtn" onclick="delPhoto();"/>
    <input type="button" value="拍照" id="saveBtn" onclick="savePhoto();"/>
</div>
<div id="photos">
    <img src="" id="img">
</div>
  </body>
</html>

servlet页面源码如下

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSON;

import sun.misc.BASE64Decoder;


public class CatD extends HttpServlet {


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		 String basePath = "upload/";
		    String filePath = request.getSession().getServletContext().getRealPath("/") + basePath;
		   // String fileName = DateUtils.getDate("yyyyMMddHHmmss") + ".png";
		    String fileName = (new Date()).getTime()+".png";
		    //默认传入的参数带类型等参数:data:image/png;base64,
		    String imgStr = request.getParameter("image");
		    if (null != imgStr) {
		        imgStr = imgStr.substring(imgStr.indexOf(",") + 1);
		    }
		    Boolean flag = GenerateImage(imgStr, filePath, fileName);
		    String result = "";
		    if (flag) {
		        result = basePath + fileName;
		    }
//		    this.writeJson(result, resp);
		    response.getWriter().print(JSON.toJSON(result));
	}

	/**
	 * 功能描述:base64字符串转换成图片
	 *
	 * @since 2016/5/24
	 */
	public boolean GenerateImage(String imgStr, String filePath, String fileName) {
	    try {
	        if (imgStr == null) {
	            return false;
	        }
	        BASE64Decoder decoder = new BASE64Decoder();
	        //Base64解码
	        byte[] b = decoder.decodeBuffer(imgStr);
	        //如果目录不存在,则创建
	        File file = new File(filePath);
	        if (!file.exists()) {
	            file.mkdirs();
	        }
	        //生成图片
	        OutputStream out = new FileOutputStream(filePath + fileName);
	        out.write(b);
	        out.flush();
	        out.close();
	        return true;
	    } catch (Exception e) {
	        return false;
	    }
	}
}

项目源码下载:链接: http://pan.baidu.com/s/1o7MM7Iq 密码: 8qeg





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