Java Tech Knowledge

How to take screen shots in Java

Following piece of code in Java that takes the screen shot of your desktop and save it in a PNG file. This example uses java.awt.Robot class to capture the screen pixels and returns a BufferedImage. Java.awt.Robot class is used to take the control of mouse and keyboard. Once you get the control, you can do any type of operation related to mouse and keyboard through your java code. This class is used generally for test automation. Copy and paste following code in your Java class and invoke the method captureScreen() with file name as argument. The screen shot will be stored in the file that you specified in argument. Please enter the full file path.

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Manipulate ISO Dates in Javascript

Following code helps you to find total number of weeks in javascript as well as getISOYear, getISOWeek.

Manipulate ISO Dates in Javascript

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Date Manipulation In Java

This Class will become very usefull when you are dealing with Dates in Java. This class provides method which you can call based on your needs.

File Name : DateManipulation.java

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DateTimeFormater Class usefull while working with dates in java

This Class will become very usefull when you are dealing with Dates in Java. This class provides method which you can call based on your needs.

File Name : DateTimeFormater.java

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Spring Exception Handling Example

The following example show how to write a simple web based application using Spring MVC Framwork, which can handle one or more exceptions raised inside its controllers. To start with it, let us have working Eclipse IDE in place and follow the following steps to develope a Dynamic Form based Web Application using Spring Web Framework:

Step 1: Create a Dynamic Web Project with a name SpringException and create following 3 new folder under src folder in the created project

1. Controller

2. Service

3. Dao

Step 2: Copy Spring and other project specific libraries into the folder WebContent/WEB-INF/lib

Step 3 : Now create below packages in specific folder

1. In Controller folder create package : com.gea.controller

2. In Service folder create package : com.gea.services

3. In Dao folder create package : com.gea.dao

Step 4: Create Spring configuration files Web.xml and spring-servlet.xml under the WebContent/WEB-INF folder.

Step 5: Create a sub-folder with a name jsp under the WebContent/WEB-INF folder. Create a view files 404error.jsp,errro.jsp,ExceptionPage.jsp,index.jsp,viewForm.jsp.