The Use Of Webcam To Capture Image And Video Streaming - Java Discussion Boards

If you really don't understand then you should go back and work through your course notes. You can also find some excellent learning materials at http://download.oracle.com/javase/tutorial/index.html[^].

I have a 64-bit Windows 8.1

The issue is that all the JRE installers version 8 update 45 for either x86 or x64 platform stop silently at the very beginning . Please note that there are no error messages appearing in messagebox form or in system event logs. Clean reboot along with all antivirus shutdown did not help. In fact I have no idea where to go further.

moonwalker72067 wrote:
In fact I have no idea where to go further.

Without more information, neither do we. Unless you can find any install logs with some error details it is anyone's guess what the issue is. You should back to the Oracle download site and ask there.

can we store a continuous real time console output into a text file in java. if yes then how we can append the next console output into the same text file.

can anybody tell me the code for that.

Use one of the many I/O mechanisms, as described in http://docs.oracle.com/javase/tutorial/essential/io/index.html[^].

I am still working on this myself, but I am kind of just needing a little reassurance that I am on the right track or a push in the right direction. This is all really new to me, and I'm honestly getting a little overwhelmed. Thank you!

You must create a sales tracking program named SalesTracking.java. This program will use arrays to store and process monthly sales as well as compute average yearly sales, total sales for the year, and which month had the highest sales and which month had the lowest sales. You should use parallel arrays. Your first array (monthArray) should be initialized with all of the months. This array should have 12 locations of course. Your other array should be named monthlySales. Like your monthArray, this array should be 12 locations that store the amount of sales for each month.

The program should prompt the user for the sales for each month starting with January. The arrays (monthlySales and monthArray) should be created in main and passed to the methods as needed. Your program should have methods that do the following.

getSales(monthArray, monthlySales): This method receives the monthArray and monthlySales arrays as arguments. It prompts the users for the sale for each month. This amount should be stored and returned into the corresponding location in the monthlySales array. For example, January sales should be stored in the first location, February sales should be stored in the second location, and so forth.

computeTotalSales(monthlySales): This method receives the monthly sales array as an argument and returns the total sales of the year.

computeAverageSales(monthlySales): This method receives the monthly sales array as an argument and returns the average sales for the year.

computeHighestMonth(monthlySales): This method receives the monthly sales array as an argument. This method will search and compare the values of the monthly sales array for the highest value. The method will return the index(or location in the array) of the month with the highest value.

computeLowestMonth(monthlySales): This method receives the monthly sales array as an argument. This method will search and compare the values of the monthly sales array for the lowest value. The method will return the index (or location in the array) of the month with the lowest value.

displaySaleInfo(totalSales, averageSales, highestMonth, highestSales, lowestMonth, lowestSales): This method will receive the total yearly sales, average monthly sale, the month with the highest sales, as well as the sales for that month and the month with the lowest sales. This method will display all of the data it received as arguments.

All methods should be STATIC therefore no object will need to be instantiated to call them. All methods must be called from the main method. Sales amounts should be rounded to two decimal places.

Java

public class SalesTracking
{
    public static void main(String[] args)
    {
        //This introduces the scanner to simplify receiving user input.
        Scanner input = new Scanner(System.in);

<pre>
    //These statements declare the variables.
            double totalSales = 0;
            double averageSales = 0;
            double highestMonth = 0;
            double lowestMonth = 0;
            double highestSales = 0;
            double lowestSales = 0;

            total = computeTotalSales(monthlySales);
            average = computeAverageSales(monthlySales);
            highest = computeHighestMonth(monthlySales);
            lowest = computeLowestMonth(monthlySales);

    //This is the array that stores the months of the year.
    String[] monthArray = {"JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", 
                           "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER"};
    for (String month : monthArray); 
    {
        System.out.println(Arrays.toString(monthArray));
    }

    //This is the array that prompts for, stores, and displays the monthly sales.
    double[] monthlySales = new double[12];
    for (int index = 0; index < monthlySales.length; index++)
    {
        System.out.print("Enter the monthly sales: ");
        monthlySales[index] = Double.parseDouble(input.nextLine());
    }
        System.out.println("The monthly sales are: ");
        for (int index = 0; index < monthlySales.length; index++)
        { 
            System.out.println(monthlySales[index]);
        }
}//This bracket ends the main.

//This method receives the monthArray and monthlySales array and prompts the user for 
//each month's sales.
public static void getSales (String monthArray, double monthlySales)
{   
}

//This method receives the monthlySales array and returns the total yearly sales.
public static double computeTotalSales(double[] monthlySales)
{
double total = 0.0;
for(double index = 0; index < monthlySales.length; index++)
{
total += monthlySales[(int) index];
}
return total;
}
//This method receives the monthlySales array and returns the average yearly sales.
public static double computeAverageSales (double[] monthlySales)
{
double averageSales = 0;
double totalSales = 0;
averageSales = totalSales/monthlySales.length;
return averageSales;
}

//This method receives the monthlySales array and returns the index (or location)
//of the month with the highest value.
public static double computeHighestMonth (double[] monthlySales)
{
double highestMonth = monthlySales[0];
for (double index = 1; index < monthlySales.length; index++)
{if(monthlySales[(int) index] > highestMonth)
{
highestMonth = monthlySales[(int) index];
}
}
return highestMonth;
}

//This method receives the monthlySales array and returns the index (or location)
//of the month with the lowest value.
public static double computeLowestMonth (double[] monthlySales)
{
double lowestMonth = monthlySales[0];
for (double index = 1; index < monthlySales.length; index++)
{if(monthlySales[(int) index] < lowestMonth)
{
lowestMonth = monthlySales[(int) index];
}
}
return lowestMonth;
}

//The method receives the total yearly sales, average monthly sales, the month
//with the highest sale and its sales, and the month with the lowest sales and
//its sales and displays all of the data.
public static double displaySaleInfo (double totalSales, double averageSales,
double highestMonth, double highestSales, double lowestMonth, double
lowestSales)
{
System.out.print("The total sales are: " + totalSales);
System.out.print("The average sales are: " + averageSales);
System.out.print("The month with the highest sales is: " + highestMonth);
System.out.print("The highest sales for that month is: " + highestSales);
System.out.print("The month with the lowest sales is: " + lowestMonth);
System.out.print("The lowest sales for that month is: " + lowestSales);
return lowestSales;
}
//This bracket ends the class.

modified 12-Jul-15 3:54am.

So what is the question? If you want to know if the code is working then you need to feed it with some test data and check the results. If you have specific areas where it is not working then you need to explain the details so we can offer suggestions.

Please in course of my search for a java web application that uses a Webcam to make a stream of video clip and with the capability of snapping image in course of the video streaming process I came across this link: http://www.webdesignermag.co.uk/capture-webcam-video-with-html5/
I realized that the program suits my need but it does not have a way of programmatically giving the video and or the captured image a unique name and a directory where they can be saved respectively. Therefore I tried to modify the index.jsp, web.xml and the ImageServlet.java codes to be able to programmatically give the video and the captured image a unique name and consequently save them in the C:/WebcamAccess directory but I had no luck. Instead I had the following output: messageHTTP method GET is not supported by this URL descriptionThe specified HTTP method is not allowed for the requested resource.
My request therefore is that you assess my work to see what I am getting wrong and correct me. I am not so proficient with java web and Netbean IDE. The attached are the work I have done so far

Index.jsp Codes:

HTML

<!DOCTYPE html>
&lt;head>
&lt;title>Web Cam Access&lt;/title>
&lt;script src="http://code.jquery.com/jquery-1.7.2.min.js">&lt;/script>
&lt;script type="text/JavaScript" src="jquery. webcam.min.js">&lt;/script>
&lt;/head>
&lt;body>
<video autoplay></video>
&lt;form>&lt;input type='button' id='capture' value="Capture Image!"/>&lt;/form>
<div id="webcam"></div>
<p><a href="javascript:webcam.capture();void(0);">
</a></p>
&lt;script type="text/javascript">
jQuery("#webcam").webcam({
width: 320,
height: 240,
mode: "callback",
swffile: "jscam.swf",
});
&lt;/script>
<canvas id='canvas' width='150' height='170'></canvas>
&lt;script language='javascript'>
document.getElementById('capture').onclick = function () {
var video = document.querySelector('video');
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, 300, 250);
var data = ctx.getImageData(0, 0, canvas.width, canvas.height);
// for (n = 0; n < data.width * data.height; n++) {
// var index = n * 4;
// data.data[index + 0] = 255 - data.data[index + 0];
// data.data[index + 1] = 255 - data.data[index + 1];
// data.data[index +`` 2] = 255 - data.data[index + 2];
// }
ctx.putImageData(data, 0, 0, canvas.width, canvas.height);
/*
* HttpRequest is used to send the image to the ImageServlet
* by the following codes...
*/
var imgData = canvas.toDataURL();
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST", "/WebcamAccess/capture", true);
xmlhttp.send(imgData);
}
&lt;/script>
&lt;script src="webcam.js">&lt;/script>
&lt;/body>
&lt;/html></pre>

<pre lang="xml"><u>Web.xml Code:
</u>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<description>Image Capture Tutorial</description>
<display-name>Tutorial</display-name>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<!-- Servlet -->
<servlet>
<servlet-name>ImageServlet</servlet-name>
<servlet-class>controller.ImageServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ImageServlet</servlet-name>
<url-pattern>/capture</url-pattern>
</servlet-mapping>
</web-app>

ImageServlet Code:

Java

package controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.Reader;
//import java.util.Random;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Decoder;
public class ImageServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        try {
            StringBuffer buffer = new StringBuffer();
            Reader reader = request.getReader();
            int current;
            while ((current = reader.read()) >= 0) {
                buffer.append((char) current);
            }
            String imgName;
            imgName = "abc";
            String data = new String(buffer);
            data = data.substring(data.indexOf(",") + 1);
            System.out.println("PNG image data on Base64: " + data);
            FileOutputStream output = new FileOutputStream(new File("/C:/WebcamAccess/"
            + imgName + ".png"));
            output.write(new BASE64Decoder().decodeBuffer(data));
            output.flush();
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

modified 8-Jul-15 7:50am.

Problem: A stock order is an order to buy/sell a given quantity of stocks of
specified company. Person willing to buy or sell a stock will submit an order to a
stock exchange, where it is executed against the opposite side order of same
company i.e, buy order is executed against an existing sell order and vice-versa.
The criteria for stock orders execution is that, they should belong to same company,
they are opposite sides ( Buy vs Sell), and order of arrival i.e, the order is executed
against the first available order. The left over quantity after execution is called
remaining quantity. For example, if a buy order of quantity 10 is executed against a
sell order of quantity 5, the remaining quantity of buy and sell orders are 5 and 0
respectively. An order status is called OPEN if the remaining quantity is greater
than zero(>0), otherwise it’s called CLOSED(i.e., remaining quantity = 0). Your
task is to implement stock order execution system which takes input orders from
console, process them and gives status and remaining quantity of all the orders as
output. The solution should efficiently handle high volumes of orders [ brute-force
approach may not be a scalable solution].

We don't do people's homework for them. Just try it yourself.

Member 11816884 wrote:
Your task is to

That means you, not someone else. People here are willing to help with problems you encounter in code that you have written. But no one is going to do your work for you.

Besides it looks more like a problem that needs analyzing than a programming problem.

If you translate it into real English (vs computer science teacher's English) it will be 1000 times easier for you to understand.

Hi everyone. I have sort of an unusual question. I'm a tech recruiter but I just became a recruiter this week. I don't know how to code at least not now, but took an AP college level class in java during my senior year in high school in 2003. On my resume for the job, i had mebtuoned that i took a class in java a while ago and he appeared in impressrd in the interview that i had some sort of experience with java. There is actually a couple of other recruiters in the office who also took java classes at some point. My boss does not know how to code and recently sent an email to the three of us asking if could have a copy of one of our notes from a java class we took.

I think he was under the impression that the class was taken more recently. He said preferably one that had been taken in the last three years I can give them to him, but would they be less helpful if they are from 12 years ago? I'd love to have him think, without lying to him, obviously, that I had taken the class more around 2012 or so. I think he knows it wasnt the last two years.

I just started and thought I wasn't picking things up fast enough so would love him to think well of me about this. I'm also going to take a mooc class on java to freshen my knowledge.

So what exactly is your question? Please read http://www.codeproject.com/Messages/3137511/Forum-Guidelines-PLEASE-READ.aspx[^].

You may also like to consider telling your boss the truth.

There's millions of tutorials on internet, actually a good manual or good book if you want read quickly is te better choice.

Message Closed

modified 7-Feb-18 13:12pm.

Please do not use the forums for soliciting reviews. If your blog is worth reading then those who are interested will see it and comment as appropriate.

ok, so it is done i.e. I have already posted this, what do I do now? can I delete this post?

i will obviously avoid posting this in the future.

"Please do not use the forums for soliciting reviews."
ok poor choice of words on my part.

"If your blog is worth reading"

mate, I get a monthly pageview count for my blog. Looking at the count, I already know that my blog is worth reading. Being a smart Java developer, I was stuck on a number of rather simple problems when I started making my iOS app, it was almost demoralising, hence the primary reason for the blog or my Github project template, is for other Java devs to not be stuck on the same problems I was stuck on.

A program that take two parameters n and i. The program should generate all possible sums that lead to n being made up of i variable.

If you are expecting someone to write this code for you, then I am afraid you have come to the wrong place. You should first write the required mathematical algorithm in plain language, and then convert that to code. When you have a specific question then come back here and people will try to help you.

Please how can i input jquery slideshows in my web?

This is the Java forum; try the Javascript forum for jQuery issues.

please how can i start using java for programming (not just in command prompt)?

Probably by studying the language. http://docs.oracle.com/javase/tutorial/index.html[^] is a good place to start.

thanks alot
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