{"id":941,"date":"2022-07-23T05:49:49","date_gmt":"2023-05-08T23:56:06","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/uncategorized\/spring-component-annotation\/"},"modified":"2024-03-06T14:40:29","modified_gmt":"2024-03-06T14:40:29","slug":"spring-component-annotation","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/spring-component-annotation\/","title":{"rendered":"Spring Component annotation"},"content":{"rendered":"

The Spring Component annotation designates a class as a Component. This implies that the Spring framework will automatically detect these classes for dependency injection when utilizing annotation-based configuration and classpath scanning.<\/p>\n

Spring Component -> Component in Spring framework.<\/h2>\n

Simply put, a Component is accountable for certain tasks. The Spring framework offers three distinct annotations that can be employed to designate a class as a Component.<\/p>\n

    \n
  1. \n
      Service: Indicates that the class offers certain services. Our utility classes can be designated as Service classes.<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \n
        1. \n
            \n
          1. \n
              Repository: This annotation signifies that the class manages CRUD operations, typically used with<\/ol>\n<\/li>\n<\/ol>\n

              DAO<\/a><\/li>\n<\/ol>\n

                implementations handling database tables.<\/ol>\n<\/li>\n<\/ol>\n

                 <\/p>\n

                  Controller: Primarily employed in web applications or REST web services to declare that the class serves as a front controller, responsible for managing user requests and providing suitable responses.<\/ol>\n

                  Please keep in mind that all of these four annotations are present in the org.springframework.stereotype package and are included in the spring-context jar. In most cases, our component classes will belong to one of these three specific annotations, which means that the @Component annotation may not be used frequently.<\/p>\n

                  An instance of a Spring component as an example.<\/h2>\n

                  We can create a basic Maven application using Spring framework to highlight the usage of Spring Component annotation and how Spring automatically detects it through annotation-based configuration and classpath scanning. To begin, generate a Maven project and include the specified spring core dependency accordingly.<\/p>\n

                  <dependency>\r\n\t<groupId>org.springframework<\/groupId>\r\n\t<artifactId>spring-context<\/artifactId>\r\n\t<version>5.0.6.RELEASE<\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\n
                  To acquire the core features of the spring framework, all we require is to create a basic component class and designate it with the @Component annotation.<\/p>\n
                  package com.scdev.spring;\r\n\r\nimport org.springframework.stereotype.Component;\r\n\r\n@Component\r\npublic class MathComponent {\r\n\r\n\tpublic int add(int x, int y) {\r\n\t\treturn x + y;\r\n\t}\r\n}\r\n<\/code><\/pre>\n
                  We are now able to establish a spring context based on annotations and retrieve the MathComponent bean from it.<\/p>\n
                  package com.scdev.spring;\r\n\r\nimport org.springframework.context.annotation.AnnotationConfigApplicationContext;\r\n\r\npublic class SpringMainClass {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tAnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();\r\n\t\tcontext.scan(\"com.scdev.spring\");\r\n\t\tcontext.refresh();\r\n\r\n\t\tMathComponent ms = context.getBean(MathComponent.class);\r\n\r\n\t\tint result = ms.add(1, 2);\r\n\t\tSystem.out.println(\"Addition of 1 and 2 = \" + result);\r\n\r\n\t\tcontext.close();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
                  Simply execute the aforementioned class as a regular java application and you will receive the subsequent output in the console.<\/p>\n
                  Jun 05, 2018 12:49:26 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh\r\nINFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@ff5b51f: startup date [Tue Jun 05 12:49:26 IST 2018]; root of context hierarchy\r\nAddition of 1 and 2 = 3\r\nJun 05, 2018 12:49:26 PM org.springframework.context.support.AbstractApplicationContext doClose\r\nINFO: Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@ff5b51f: startup date [Tue Jun 05 12:49:26 IST 2018]; root of context hierarchy\r\n<\/code><\/pre>\n
                  \"spring<\/div>\n
                  @Component(\"mc\")\r\npublic class MathComponent {\r\n}\r\n<\/code><\/pre>\n
                  MathComponent ms = (MathComponent) context.getBean(\"mc\");\r\n<\/code><\/pre>\n
                  Even though I applied the @Component annotation to MathComponent, it should actually be labeled as a service class with the @Service annotation. The outcome will remain unchanged.<\/p>\n
                  You have the option to retrieve the project from our GitHub Repository.<\/p>\n
                  Source: API Documentation<\/p>\n
                  Paraphrased: Documentation on Application Programming Interface<\/p>\n
                   <\/p>\n
                  more tutorials<\/p>\n
                  React Application Component Testing Integrate with Playwright(Opens in a new browser tab)<\/span><\/a><\/p>\n
                  Spring MVC HandlerInterceptorAdapter and HandlerInterceptor.(Opens in a new browser tab)<\/span><\/a><\/p>\n
                  Spring Boot CLI(Opens in a new browser tab)<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
                  The Spring Component annotation designates a class as a Component. This implies that the Spring framework will automatically detect these classes for dependency injection when utilizing annotation-based configuration and classpath scanning. Spring Component -> Component in Spring framework. Simply put, a Component is accountable for certain tasks. The Spring framework offers three distinct annotations that […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-941","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nSpring Component annotation - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"The Spring Component annotation designates a class as a Component. 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