{"id":18134,"date":"2024-03-15T16:18:12","date_gmt":"2024-03-15T16:18:12","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-bean-injection-done-in-spring\/"},"modified":"2024-03-21T12:34:57","modified_gmt":"2024-03-21T12:34:57","slug":"how-is-bean-injection-done-in-spring","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-bean-injection-done-in-spring\/","title":{"rendered":"How is bean injection done in Spring?"},"content":{"rendered":"

In Spring, there are three common ways to inject beans: constructor injection, setter injection, and field injection.<\/p>\n

    \n
  1. Constructor injection: Dependency injection is achieved by using the @Autowired or @Inject annotation on the class constructor. When the Spring container creates a bean, it automatically checks the constructor parameters and injects the matching dependencies into the constructor. For example:<\/li>\n<\/ol>\n
    @Service<\/span>\r\npublic<\/span> class<\/span> UserService<\/span> {\r\n    private<\/span> UserRepository userRepository;\r\n\r\n    @Autowired<\/span>\r\n    public<\/span> UserService<\/span>(UserRepository userRepository)<\/span> {\r\n        this<\/span>.userRepository = userRepository;\r\n    }\r\n}\r\n<\/code><\/pre>\n
      \n
    1. Setter injection: Dependency injection can be achieved by using the @Autowired or @Inject annotation on the setter methods of a class. When the Spring container creates a bean, it automatically calls the corresponding setter method and injects the matching dependency into the property. For example:<\/li>\n<\/ol>\n
      @Service<\/span>\r\npublic<\/span> class<\/span> UserService<\/span> {\r\n    private<\/span> UserRepository userRepository;\r\n\r\n    @Autowired<\/span>\r\n    public<\/span> void<\/span> setUserRepository<\/span>(UserRepository userRepository)<\/span> {\r\n        this<\/span>.userRepository = userRepository;\r\n    }\r\n}\r\n<\/code><\/pre>\n
        \n
      1. Field injection: Dependency injection is achieved by using the @Autowired or @Inject annotation on the fields of a class. When the Spring container creates a bean, it automatically injects the matching dependencies into the fields. For example,<\/li>\n<\/ol>\n
        @Service<\/span>\r\npublic<\/span> class<\/span> UserService<\/span> {\r\n    @Autowired<\/span>\r\n    private<\/span> UserRepository userRepository;\r\n}\r\n<\/code><\/pre>\n
        In addition to the common injection methods mentioned above, you can also use the @Inject annotation from the JSR-330 specification or the @Qualifier annotation from Spring to specify specific dependency injections. Additionally, you can use the @Bean annotation in Java configuration classes to define beans and inject them into other beans.<\/p>\n","protected":false},"excerpt":{"rendered":"
        In Spring, there are three common ways to inject beans: constructor injection, setter injection, and field injection. Constructor injection: Dependency injection is achieved by using the @Autowired or @Inject annotation on the class constructor. When the Spring container creates a bean, it automatically checks the constructor parameters and injects the matching dependencies into the constructor. […]<\/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-18134","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow is bean injection done in Spring? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-is-bean-injection-done-in-spring\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How is bean injection done in Spring?\" \/>\n<meta property=\"og:description\" content=\"In Spring, there are three common ways to inject beans: constructor injection, setter injection, and field injection. 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