SpringBoot Annotations

SpringBoot Annotations

Before proceeding further let us first understand some important annotations of Spring Boot.

@SpringBootApplication: annotation is equivalent to using @Configuration, @EnableAutoConfiguration and @ComponentScan with their default attributes.  One thing to note here regarding ComponentScan is, @SpringBootApplication scans only the subpackages. i.e. for example if the main class is in com.javainfinite, then it will scan all classes from com.javainfinite.* packages.

@EnableAutoConfiguration: attempting to guess and configure beans. If we use SpringBootApplication this annotation is auto enabled and has no effect adding it again

@Controller: marks as web application controller

@RestController: works same as @Controller annotation except @ResponseBody is active by default. In case of @Controller we need to declare @ResponseBody.

@ResponseBody: returns value to the response as HTTP Response body

@RequestMapping: to map the URL for the particular method of entire class

@RequestParam: accessing query parameter values from the request

@PathVariable: pattern that is used in the URI for the incoming request

There are various other annotations too, above explained annotations are the ones most commonly used in springboot.

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Basic Spring Boot Application Example

Basic Spring Boot Application Example:

We have already went through various examples using spring, To understand spring please refer here.

What is Spring Boot?
Spring Boot is a way to create stand-alone applications with less or no configurations and has defaults for annotation configuration which we will use in our application

Advantages of Spring Boot:

  • Reduces development time
  • Embedded Servers
  • No XML configuration
  • Integration with Spring JDBC, Spring ORM etc.

Now let us see an basic example to create spring boot application in Netbeans.

Structure:

pom.xml

SpringBootApp.java

Output:

We have created basic spring boot application!

 

 

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