{"id":308,"date":"2025-09-10T13:00:00","date_gmt":"2025-09-10T13:00:00","guid":{"rendered":"https:\/\/springmasteryhub.com\/?p=308"},"modified":"2025-09-03T12:59:01","modified_gmt":"2025-09-03T12:59:01","slug":"what-is-service-in-spring","status":"publish","type":"post","link":"https:\/\/springmasteryhub.com\/?p=308","title":{"rendered":"What is @Service In Spring?"},"content":{"rendered":"\n

This is a class-level annotation<\/strong> that is a specialization of @Component<\/code> designed to handle business logic. It will turn your class into a Spring-managed bean<\/strong>.<\/p>\n\n\n\n

Why is it important?<\/h2>\n\n\n\n

By using this annotation, you are implementing a separation of concerns<\/strong> by placing the business logic in a specific layer, thereby improving code readability<\/strong>.<\/p>\n\n\n\n

How to use it?<\/h2>\n\n\n\n

First, define a class annotated with @Service<\/code> that has some business logic in the methods:<\/p>\n\n\n\n

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package<\/span> <\/span>com.example.demo.service<\/span>;<\/span><\/span>\n<\/span>\nimport<\/span> org.springframework.stereotype.Service;<\/span><\/span>\n<\/span>\n@<\/span>Service<\/span><\/span>\npublic<\/span> <\/span>class<\/span> <\/span>UserService<\/span> {<\/span><\/span>\n<\/span>\n    <\/span>public<\/span> <\/span>String<\/span> <\/span>getWelcomeMessage<\/span>(<\/span>String<\/span> <\/span>username<\/span>) {<\/span><\/span>\n        <\/span>return<\/span> <\/span>"<\/span>Welcome, <\/span>"<\/span> <\/span>+<\/span> username <\/span>+<\/span> <\/span>"<\/span>!<\/span>"<\/span>;<\/span><\/span>\n    }<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
Then inject your created service where it\u2019s needed:<\/p>\n\n\n\n
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package<\/span> <\/span>com.example.demo.controller<\/span>;<\/span><\/span>\n<\/span>\nimport<\/span> com.example.demo.service.UserService;<\/span><\/span>\nimport<\/span> org.springframework.web.bind.annotation.<\/span>*<\/span>;<\/span><\/span>\n<\/span>\n@<\/span>RestController<\/span><\/span>\n@<\/span>RequestMapping<\/span>(<\/span>"<\/span>\/users<\/span>"<\/span>)<\/span><\/span>\npublic<\/span> <\/span>class<\/span> <\/span>UserController<\/span> {<\/span><\/span>\n<\/span>\n    <\/span>private<\/span> <\/span>final<\/span> <\/span>UserService<\/span> userService;<\/span><\/span>\n<\/span>\n    <\/span>public<\/span> <\/span>UserController<\/span>(<\/span>UserService<\/span> <\/span>userService<\/span>) {<\/span><\/span>\n        <\/span>this<\/span>.userService <\/span>=<\/span> userService;<\/span><\/span>\n    }<\/span><\/span>\n<\/span>\n    @<\/span>GetMapping<\/span>(<\/span>"<\/span>\/{username}<\/span>"<\/span>)<\/span><\/span>\n    <\/span>public<\/span> <\/span>String<\/span> <\/span>welcomeUser<\/span>(@<\/span>PathVariable<\/span> <\/span>String<\/span> <\/span>username<\/span>) {<\/span><\/span>\n        <\/span>return<\/span> userService.<\/span>getWelcomeMessage<\/span>(username);<\/span><\/span>\n    }<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
Let\u2019s test it<\/h2>\n\n\n\n
Let\u2019s call our endpoint<\/p>\n\n\n\n
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curl<\/span> <\/span><<\/span>http:\/\/localhost:8080\/users\/SpringMaster<\/span>y<\/span>><\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
The result should look like this:<\/p>\n\n\n\n
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Welcome,<\/span> <\/span>SpringMastery!<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
That\u2019s it, it’s that easy to create a service in your application. Now you know how<\/strong>, when to use<\/strong>, and how important<\/strong> this annotation is in your Spring applications.<\/p>\n\n\n\n
Have you ever thought about the difference between @Service<\/code> and @Component<\/code>?<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
This is a class-level annotation that is a specialization of @Component designed to handle business logic. It will turn your class into a Spring-managed bean. Why is it important? By using this annotation, you are implementing a separation of concerns by placing the business logic in a specific layer, thereby improving code readability. How to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,6],"tags":[13,18,20,22,23,24,26],"class_list":["post-308","post","type-post","status-publish","format-standard","hentry","category-java","category-spring","tag-java","tag-programming","tag-software-development","tag-spring-boot","tag-spring-framework","tag-springboot","tag-technology"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=\/wp\/v2\/posts\/308","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=308"}],"version-history":[{"count":1,"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=\/wp\/v2\/posts\/308\/revisions"}],"predecessor-version":[{"id":309,"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=\/wp\/v2\/posts\/308\/revisions\/309"}],"wp:attachment":[{"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/springmasteryhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}