It helps you to understand and handle your money. A payslip is an essential record of your employment. You can see the flexibility of the above Spring application by changing the value of "message" property and keeping both the source files unchanged.If you are an employee or have been in the past, definitely you would have come across a payslip or payslip template at some point of your life. If everything is fine with your application, this will print the following message in Eclipse IDE's console −Ĭongratulations, you have successfully created your first Spring Application. To do this, keep MainApp.Java file tab active and use either Run option available in the Eclipse IDE or use Ctrl + F11 to compile and run your MainApp application. Once you are done with creating the source and beans configuration files, you are ready for this step, which is compiling and running your program. You can use tag to pass the values of different variables used at the time of object creation. When Spring application gets loaded into the memory, Framework makes use of the above configuration file to create all the beans defined and assigns them a unique ID as defined in tag. For example, using the following file you can pass any value for "message" variable and you can print different values of message without impacting HelloWorld.java and MainApp.java files. The Beans.xml is used to assign unique IDs to different beans and to control the creation of objects with different values without impacting any of the Spring source files. You have to make sure that this file is available in CLASSPATH and use the same name in the main application while creating an application context as shown in MainApp.java file. Usually developers name this file as Beans.xml, but you are independent to choose any name you like. This file needs to be created under the src directory as shown in the following screenshot − You need to create a Bean Configuration file which is an XML file and acts as a cement that glues the beans, i.e. Once you have an object, you can use this object to call any class method. This method uses bean ID to return a generic object, which finally can be casted to the actual object. The second step is used to get the required bean using getBean() method of the created context. beans mentioned in the configuration file. This API loads beans configuration file and eventually based on the provided API, it takes care of creating and initializing all the objects, i.e. The first step is to create an application context where we used framework API ClassPathXmlApplicationContext(). HelloWorld obj = (HelloWorld) context.getBean("helloWorld") įollowing two important points are to be noted about the main program − Import .ClassPathXmlApplicationContext ĪpplicationContext context = new ClassPathXmlApplicationContext("Beans.xml") ("Your Message : " + message) įollowing is the content of the second file MainApp.java − Here is the content of HelloWorld.java file − Next we will create HelloWorld.java and MainApp.java files under the com.tutorialspoint package. To do this, right click on src in package explorer section and follow the option − New → Package. First we need to create a package called com.tutorialspoint. Now let us create actual source files under the HelloSpring project. Now use Add External JARs button available under the Libraries tab to add the following core JARs from Spring Framework and Common Logging installation directories − To do this, right-click on your project name HelloSpring and then follow the following option available in the context menu − Build Path → Configure Build Path to display the Java Build Path window as follows − Once your project is created successfully, you will have the following content in your Project Explorer − Step 2 - Add Required LibrariesĪs a second step let us add Spring Framework and common logging API libraries in our project. Now name your project as HelloSpring using the wizard window as follows −
Follow the option File → New → Project and finally select Java Project wizard from the wizard list. The first step is to create a simple Java Project using Eclipse IDE.
Now let us proceed to write a simple Spring Application, which will print "Hello World!" or any other message based on the configuration done in Spring Beans Configuration file.
We also assume that you have a bit of working knowledge on Eclipse IDE. Before you start writing your first example using Spring framework, you have to make sure that you have set up your Spring environment properly as explained in Spring - Environment Setup Chapter. Let us start actual programming with Spring Framework.
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