Steps to Create Spring First Program

1. Open any IDE & Create New Project
2. Add Spring Jar Files (or Dependencies if using MAVEN)
3. Create POJO Class i.e. Student and Annotate the POJO with "@Component" Annotation
4. Enable Component Scanning with @ComponentScan
5. Create Main Class, Start the Container & Access the Beans

1. Open any IDE & Create New Project

• Open any IDE like Eclipse, IntelliJ, Spring Tool Suit (STS) etc and create new project as shown below.
  
  
• Note : In our case we are using Eclipse IDE.
  
  
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2. Add Spring Jar Files (or Dependencies if using MAVEN)

• Add Spring Jar Files (If you are creating simple Java Project) OR Add Spring Dependency (If you are creating MAVEN Project)
  
  
• Note : Here we are taken simple Java Project, MAVEN will be explained in further tutorials.
  
  
• Required Jar Files are as below
  
  1. spring-core-x.x.x.jar
  2. spring-beans-x.x.x.jar
  3. spring-context-x.x.x.jar
  4. spring-expression-x.x.x.jar
  5. spring-aop-x.x.x.jar
  6. commons-logging-x.x.jar
  Where xxx is the version of jar file
  
  
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3. Create POJO Class i.e. Student and Annotate the POJO with "@Component" Annotation

• Create one POJO class i.e. "Student" in package "in.sp.beans" and create one display() method to print Student details.
  
  
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• Annotate the Student class with @Component Annotation, below is the full code.

• Student.java

  package in.sp.beans;
  
  import org.springframework.stereotype.Component;
  
  @Component
  public class Student
  {
  	private String name;
  	private int rollno;
  	private String emailid;
  	
  	public String getName() {
  		return name;
  	}
  	public void setName(String name) {
  		this.name = name;
  	}
  	public int getRollno() {
  		return rollno;
  	}
  	public void setRollno(int rollno) {
  		this.rollno = rollno;
  	}
  	public String getEmailid() {
  		return emailid;
  	}
  	public void setEmailid(String emailid) {
  		this.emailid = emailid;
  	}
  	
  	public void display()
  	{
  		System.out.println("Name : "+name);
  		System.out.println("Roll No : "+rollno);
  		System.out.println("Email Id : "+emailid);
  	}
  }

• By using @Component annotation, Spring Container automatically creates the Bean Object.

4. Enable Component Scanning with @ComponentScan

• Now click on src folder and create one Java Class i.e. AppConfig.java in "in.sp.config" package.
  
  
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• Note : We can provide any package name instead of "in.sp.config" and any Java Configuration File name instead of "AppConfig.java".
  
  
• Note : Here we are providing the configurations using Annotations, Click Here for Spring Program using "Java Configuration File".
  
  
• Below is the full code of Configuration File

• AppConfig.java

  package in.sp.config;
  
  import org.springframework.context.annotation.ComponentScan;
  import org.springframework.context.annotation.Configuration;
  
  @Configuration
  @ComponentScan(basePackages = "in.sp.beans")
  public class AppConfig
  {
      // No bean definitions are required here
  }

• @Configuration is used to indicate that the class (AppConfig) is a configuration class.
• @ComponentScan is used to tell Spring to scan for components (POJO or JavaBean Classes) in the specified package.

5. Create Main Class, Start the Container & Access the Beans

• Right click on src folder and create new class i.e. MainApp in package name "in.sp.main".
  
  
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• Now create main method.
• Next create Spring Container (We will use ApplicationContext as this is new Spring Container) and load the Spring Configuration File (Java file).

  ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);

• Access the Java Bean Object and call the method
• Below is the full code :

  MainApp.java

  package in.sp.main;
  
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.annotation.AnnotationConfigApplicationContext;
  
  import in.sp.beans.Student;
  import in.sp.config.AppConfig;
  
  public class MainApp 
  {
  	public static void main(String[] args)
  	{
          //Spring container is created
  		ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
  		
          //Bean object is requested from Spring Container and stored in Student reference
  		Student std = context.getBean(Student.class);
  
  		std.display();
  	}
  }

• Now right click on the project or MainApp.java class and run the program, lets see below what happens :
  
  
  
  
• Yes; we got the output but wait, why its showing 0 and null...!!
• Its because we didnt initialized the bean object. For this we will use @Value annotation in POJO class as below.

• MainApp.java

  package in.sp.beans;
  
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.stereotype.Component;
  
  @Component
  public class Student
  {
  	@Value("Deepak")
  	private String name;
  	
  	@Value("103")
  	private int rollno;
  	
  	@Value("deepak@gmail.com")
  	private String emailid;
  	
  	public String getName() {
  		return name;
  	}
  	public void setName(String name) {
  		this.name = name;
  	}
  	public int getRollno() {
  		return rollno;
  	}
  	public void setRollno(int rollno) {
  		this.rollno = rollno;
  	}
  	public String getEmailid() {
  		return emailid;
  	}
  	public void setEmailid(String emailid) {
  		this.emailid = emailid;
  	}
  	
  	public void display()
  	{
  		System.out.println("Name : "+name);
  		System.out.println("Roll No : "+rollno);
  		System.out.println("Email Id : "+emailid);
  	}
  }

• Now run the program again.
  
  
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• Hurrey, this time we got the output...!!