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Burak Boduro─člu
Burak Boduro─člu

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Spring Boot Cheat Sheet

­čî▒ Spring Annotations

@Repository :

  • Class Level Annotation
  • It can reach the database and do all the operations.
  • It make the connection between the database and the business logic.
  • DAO is a repository.
  • It is a marker interface.
@Repository
public class TestRepo{
   public void add(){
      System.out.println("Added");
   }
}
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@Service :

  • Class Level Annotation
  • It is a marker interface.
  • It is a business logic.
  • It is a service layer.
  • It used to create a service layer.
@Service
public class TestService{
   public void service1(){
      //business code (i┼č kodlar─▒)
   }
}
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@Autowired :

  • Field Level Annotation
  • It is used to inject the dependency.
  • It is used to inject the object.
  • It is used to inject the object reference.
  • Dependency Injection is a design pattern.
public class Brand{
   private int id;
   private String name;

   @Autowired
   public Brand(int id, String name){
     this.id = id;
     this.name = name;
   }
}
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@Controller :

  • Class Level Annotation
  • It is a marker interface.
  • It is a controller layer.
  • It is used to create a controller layer.
  • It use with @RequestMapping annotation.
@Controller
@RequestMapping("/api/brands")
public class BrandsController{
   @GetMapping("/getall")
   public Employee getAll(){
       return brandService.getAll();
   }
}
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@RequestMapping :

  • Method Level Annotation
  • It is used to map the HTTP request with specific method.
@Controller
@RequestMapping("/api/brands")
public class BrandsController{
   @GetMapping("/getall")
   public Employee getAll(){
       return brandService.getAll();
   }
}
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@GetMapping :

  • Method Level Annotation
  • It is used to map the HTTP GET request with specific method.
  • It is used to get the data.
  • It is used to read the data.
  @GetMapping("/getall")
  public Employee getAll(){
      return brandService.getAll();
  }
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@PostMapping :

  • Method Level Annotation
  • It is used to map the HTTP POST request with specific method.
  • It is used to add the data.
  • It is used to create the data.
  @PostMapping("/add")
  public void add(@RequestBody Brand brand){
      brandService.add(brand);
  }
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@PutMapping :

  • Method Level Annotation
  • It is used to map the HTTP PUT request with specific method.
  • It is used to update the data.
  @PutMapping("/update")
  public void update(@RequestBody Brand brand){
      brandService.update(brand);
  }
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@DeleteMapping :

  • Method Level Annotation
  • It is used to map the HTTP DELETE request with specific method.
  • It is used to delete the data.
  @DeleteMapping("/delete")
  public void delete(@RequestBody Brand brand){
      brandService.delete(brand);
  }
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@PathVariable :

  • Method Level Annotation
  • It is used to get the data from the URL.
  • It is the most suitable for RESTful web service that contains a path variable.
  @GetMapping("/getbyid/{id}")
  public Brand getById(@PathVariable int id){
      return brandService.getById(id);
  }
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@RequestBody:

  • It is used to get the data from the request body.
  • It is used to get the data from the HTTP request.
  • It is used to get the data from the HTTP request body.
  @PostMapping("/add")
  public void add(@RequestBody Brand brand){
      brandService.add(brand);
  }
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@RequestParam:

  • It is used to get the data from the URL.
  • It is used to get the data from the URL query parameters.
  • It is also known as query parameter.
@GetMapping("/getbyid")
public Brand getById(@RequestParam int id){
    return brandService.getById(id);
}
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@RestController:

  • Class Level Annotation
  • It is a marker interface.
  • It is a controller layer.
  • It is used to create a controller layer.
  • It use with @RequestMapping annotation.
  • It is a combination of @Controller and @ResponseBody annotations.
  • @RestController annotation is explained with @ResponseBody annotation.
  • @ResponseBody eliminates the need to add a comment to every method.
@RestController
@RequestMapping("/api/brands")
public class BrandsController{
   @GetMapping("/getall")
   public Employee getAll(){
       return brandService.getAll();
   }
}
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