{"id":87,"date":"2019-03-06T12:49:32","date_gmt":"2019-03-06T12:49:32","guid":{"rendered":"https:\/\/www.kindsonthegenius.com\/spring-boot\/?p=87"},"modified":"2020-07-26T08:12:43","modified_gmt":"2020-07-26T08:12:43","slug":"10-spring-boot-using-the-business-service","status":"publish","type":"post","link":"https:\/\/www.kindsonthegenius.com\/spring-boot\/10-spring-boot-using-the-business-service\/","title":{"rendered":"Spring Boot – Using the Business Service"},"content":{"rendered":"

We would learn about how to use the business services we created previously. We actually will move the logic from the controller to the business service.<\/p>\n

 <\/p>\n

    \n
  1. How Business Service Work<\/a><\/li>\n
  2. Adding Dependency to the Controller<\/a><\/li>\n
  3. The UserService and Controller<\/a><\/li>\n
  4. The PostService and Controller<\/a><\/li>\n
  5. The Location Service and Controller<\/a><\/li>\n<\/ol>\n

     <\/p>\n

    1. How Business Service Work<\/strong><\/h4>\n

    Remember that we already wrote a method to get items. For instance, getAllUsers returns list of all the users. In the same way, getAllLocations returns list of all location. We wrote these methods in the controller file. The fact is that we actually need to get these information from the business service.Business Service is also called Data Access Layer.<\/p>\n

    So if we need a list of users, we ask the business service to provide it. Also if we need a list of locations, we simply ask the business service and so on.<\/p>\n

    This then means that the controller should actually be talking to the business service.<\/p>\n

    However all this is made possible by Dependency Injection<\/a>.<\/p>\n

     <\/p>\n

     <\/p>\n

    2. Add the Dependencies to the Controllers\u00a0<\/strong><\/h4>\n

    We need to enable dependency injection in our controller files.\u00a0 To to that, we take two steps:<\/p>\n

      \n
    • Create a private member variable in the controller class<\/li>\n
    • Add the @Autowired annotation to this member variable<\/li>\n
    • The move the get methods over to the business service<\/li>\n<\/ul>\n

      So when application starts, a new instance of the business service is created and registered. Then when a controller is created, Spring checks if there is an @Autowired annotation. If yes, then it takes the existing instance of the business service and injects it into the controller.<\/p>\n

       <\/p>\n

       <\/p>\n

      3. The User Service and Controller<\/strong><\/h4>\n

      After adding the dependency injection to the UserController and moving the getAllUser() method to the UserService, the the User controller would be as below:<\/p>\n

       <\/p>\n

      package<\/span> com.<\/span>kindsonthegenius<\/span>.<\/span>social<\/span>.<\/span>user<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RequestMapping<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RestController<\/span>;<\/span>\r\n\r\nimport<\/span> com.kindsonthegenius.social.location.Location<\/span>;<\/span>\r\n\r\n@RestController<\/span>\r\npublic<\/span> class<\/span> userController<\/span> {<\/span>\r\n\t\r\n\t@Autowired<\/span>\r\n\tprivate<\/span> UserService userService;<\/span>\r\n\t\r\n\t@RequestMapping<\/span>(<\/span>value=<\/span>\"\/users\"<\/span>)<\/span>\r\n\tpublic<\/span> List<<\/span>User><\/span> getAllUsers<\/span>()<\/span> {<\/span>\r\n\r\n\t\treturn<\/span> userService.<\/span>getAllUsers<\/span>();<\/span>\t\r\n\t}<\/span>\r\n}<\/span>\r\n<\/pre>\n
      Listing 1.0: The UserController Class<\/p>\n
       <\/p>\n
      Similarly, the userService would now contain the definition for list of Users as shown below<\/p>\n
       <\/p>\n
      package<\/span> com.<\/span>kindsonthegenius<\/span>.<\/span>social<\/span>.<\/span>user<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.stereotype.Service<\/span>;<\/span>\r\n\r\nimport<\/span> com.kindsonthegenius.social.location.Location<\/span>;<\/span>\r\n\r\n@Service<\/span>\r\npublic<\/span> class<\/span> UserService<\/span> {<\/span>\r\n\t\r\n   User user1 =<\/span> new<\/span> User(<\/span>\r\n\t\"u1\"<\/span>,<\/span> \r\n\t\"Jany\"<\/span>,<\/span> \r\n\t\"Lawrence\"<\/span>,<\/span>\r\n\tnew<\/span> Location<\/span>(<\/span>\"l1\"<\/span>,<\/span> \"Lagos\"<\/span>),<\/span>\r\n\t\"Jany@gmail.com\"<\/span>);<\/span>\r\n\t\r\n   User user2 =<\/span> new<\/span> User(<\/span>\r\n\t\"u2\"<\/span>,<\/span> \r\n\t\"Jadon\"<\/span>,<\/span> \r\n\t\"Mills\"<\/span>,<\/span>\r\n\tnew<\/span> Location<\/span>(<\/span>\"l2\"<\/span>,<\/span> \"Asaba\"<\/span>),<\/span>\r\n\t\t\t\"Jadon@gmail.com\"<\/span>);<\/span>\r\n\t\r\n   private<\/span> List<<\/span>User><\/span> users =<\/span> Arrays.<\/span>asList<\/span>(<\/span>user1,<\/span> user2);<\/span>\t\r\n\t\r\n   public<\/span> List<<\/span>User><\/span> getAllUsers<\/span>()<\/span> {<\/span>\r\n\treturn<\/span> users;<\/span>\r\n   }<\/span>\r\n}<\/span>\r\n<\/pre>\n
      Listing 1.1: The UserService Class<\/p>\n
       <\/p>\n
      Test the Application<\/strong><\/p>\n
      To test the application, right-click on the the project and choose Run As > Spring Boot Application<\/p>\n
      Then visit localhost:8000\/users<\/p>\n
      You will get a list of users in the json format. Now, everything work fine!<\/p>\n
       <\/p>\n
       <\/p>\n
      4. The Post Service and Controller<\/strong><\/h4>\n
      Follow the same method to adjust the PostService and PostController files. The PostController File would be as shown below:<\/p>\n
       <\/p>\n
      package<\/span> com.<\/span>kindsonthegenius<\/span>.<\/span>social<\/span>.<\/span>post<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RequestMapping<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RestController<\/span>;<\/span>\r\n\r\n@RestController<\/span>\r\npublic<\/span> class<\/span> PostController<\/span> {<\/span>\r\n\t\r\n\t@Autowired<\/span>\r\n\tprivate<\/span> PostService postService;<\/span>\r\n\t\r\n\t@RequestMapping<\/span>(<\/span>value =<\/span> \"\/posts\"<\/span>)<\/span>\r\n\tpublic<\/span> List<<\/span>Post><\/span> getAllPosts<\/span>()<\/span> {<\/span>\r\n\t\t\r\n\t\treturn<\/span> postService.<\/span>getAllPosts<\/span>();<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/pre>\n
      Listing 1.2: Content of the PostConroller file<\/p>\n
       <\/p>\n
      Similarly, the content of PostService would be as shown below<\/p>\n
       <\/p>\n
      package<\/span> com.<\/span>kindsonthegenius<\/span>.<\/span>social<\/span>.<\/span>post<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.stereotype.Service<\/span>;<\/span>\r\n\r\nimport<\/span> com.kindsonthegenius.social.location.Location<\/span>;<\/span>\r\nimport<\/span> com.kindsonthegenius.social.user.User<\/span>;<\/span>\r\n\r\n@Service<\/span>\r\npublic<\/span> class<\/span> PostService<\/span> {<\/span>\r\n\r\n   User user1 =<\/span> new<\/span> User(<\/span>\r\n\t\"u1\"<\/span>,<\/span> \r\n\t\"Jany\"<\/span>,<\/span> \r\n\t\"Lawrence\"<\/span>,<\/span>\r\n\tnew<\/span> Location<\/span>(<\/span>\"l1\"<\/span>,<\/span> \"Lagos\"<\/span>),<\/span>\r\n\t\"Jany@gmail.com\"<\/span>);<\/span>\r\n\t\r\n   User user2 =<\/span> new<\/span> User(<\/span>\r\n\t\"u2\"<\/span>,<\/span> \r\n\t\"Jadon\"<\/span>,<\/span> \r\n\t\"Mills\"<\/span>,<\/span>\r\n\tnew<\/span> Location<\/span>(<\/span>\"l2\"<\/span>,<\/span> \"Asaba\"<\/span>),<\/span>\r\n\t\"Jadon@gmail.com\"<\/span>);<\/span>\r\n\t\r\n   Post post1 =<\/span> new<\/span> Post(<\/span>\r\n\t\"p1\"<\/span>,<\/span>\r\n\t\"01-Jan-19\"<\/span>,<\/span>\r\n\tuser1,<\/span>\r\n\t\"Its good to love and be loved\"<\/span>);<\/span>\r\n\t\r\n   Post post2 =<\/span> new<\/span> Post(<\/span>\r\n\t\"p2\"<\/span>,<\/span>\r\n\t\"02-Jan-19\"<\/span>,<\/span>\r\n\tuser2,<\/span>\r\n\t\"We all need someone\"<\/span>);<\/span>\r\n\t\r\n   List<<\/span>Post><\/span> posts =<\/span> Arrays.<\/span>asList<\/span>(<\/span>post1,<\/span> post2);<\/span>\r\n\t\r\n   public<\/span> List<<\/span>Post><\/span> getAllPosts<\/span>()<\/span> {<\/span>\r\n\treturn<\/span> posts;<\/span>\r\n   }<\/span>\r\n\t\r\n}<\/span>\r\n<\/pre>\n
      Listing 1.3: Content of the PostService class<\/p>\n
       <\/p>\n
       <\/p>\n
      5. The Location Service and Controller<\/strong><\/h4>\n
      Finally, modify the LocationService and Location Controller files. You LocationController class would then be as shown below:<\/p>\n
       <\/p>\n
      package<\/span> com.<\/span>kindsonthegenius<\/span>.<\/span>social<\/span>.<\/span>location<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RequestMapping<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RestController<\/span>;<\/span>\r\n\r\n@RestController<\/span>\r\npublic<\/span> class<\/span> LocationController<\/span> {<\/span>\r\n\t\r\n   @Autowired<\/span>\r\n   private<\/span> LocationService locationService;<\/span>\r\n\t\r\n   @RequestMapping<\/span>(<\/span>value =<\/span> \"\/locations\"<\/span>)<\/span>\r\n   public<\/span> List<<\/span>Location><\/span> getAllLocations<\/span>()<\/span> \r\n   {<\/span>\r\n\treturn<\/span> locationService.<\/span>getAllLocations<\/span>();<\/span>\r\n   }<\/span>\t\t\r\n\r\n}<\/span>\r\n<\/pre>\n
      Listing 1.4: Content of the LocationController class<\/p>\n
       <\/p>\n
      Similarly, the content of LocationService would be as shown below<\/p>\n
       <\/p>\n
      package<\/span> com.<\/span>kindsonthegenius<\/span>.<\/span>social<\/span>.<\/span>location<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.ArrayList<\/span>;<\/span>\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\nimport<\/span> java.util.Optional<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.stereotype.Service<\/span>;<\/span>\r\n\r\n@Service<\/span>\r\npublic<\/span> class<\/span> LocationService<\/span> {<\/span>\r\n\t\r\n   Location location1 =<\/span> new<\/span> Location(<\/span>\"l1\"<\/span>,<\/span> \"Lagos\"<\/span>);<\/span>\r\n   Location location2 =<\/span> new<\/span> Location(<\/span>\"l2\"<\/span>,<\/span> \"Asaba\"<\/span>);<\/span>\r\n   Location location3 =<\/span> new<\/span> Location(<\/span>\"l3\"<\/span>,<\/span> \"Budapest\"<\/span>);<\/span>\t\r\n   \r\n   List<<\/span>Location><\/span> locations =<\/span> Arrays.<\/span>asList<\/span>(<\/span>location1,<\/span> location2,<\/span> location3);<\/span>\r\n\t\r\n   public<\/span> List<<\/span>Location><\/span> getAllLocations<\/span>()<\/span> {<\/span>\r\n\t\t\r\n\treturn<\/span> locations;<\/span>\r\n   }<\/span>\r\n\r\n}<\/span>\r\n<\/pre>\n
      Listing 1.5: Content of the LocationService class<\/p>\n
       <\/p>\n
      Finally, go ahead to test the application.Access the following urls:<\/p>\n
      http:\/\/localhost:8080\/users<\/p>\n
      http:\/\/localhost:8080\/posts<\/p>\n
      http:\/\/localhost:8080\/locations<\/p>\n","protected":false},"excerpt":{"rendered":"
      We would learn about how to use the business services we created previously. We actually will move the logic from the controller to the business … <\/p>\n","protected":false},"author":1,"featured_media":90,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-87","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring-boot-tutorials"],"yoast_head":"\nSpring Boot - Using the Business Service - Learn Spring Boot<\/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.kindsonthegenius.com\/spring-boot\/10-spring-boot-using-the-business-service\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spring Boot - Using the Business Service - Learn Spring Boot\" \/>\n<meta property=\"og:description\" content=\"We would learn about how to use the business services we created previously. 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