Spring Boot Cheat Sheet – DEV Community

🌱 Spring Annotations

@Repository :

• Class Stage Annotation
• It will possibly attain the database and do all of the operations.
• It make the connection between the database and the enterprise logic.
• DAO is a repository.
• It’s a marker interface.

@Repository
public class TestRepo{
   public void add(){
      System.out.println("Added");
   }
}

@Service :

• Class Stage Annotation
• It’s a marker interface.
• It’s a enterprise logic.
• It’s a service layer.
• It used to create a service layer.

@Service
public class TestService{
   public void service1(){
      //enterprise code (iş kodları)
   }
}

@Autowired :

• Subject Stage Annotation
• It’s used to inject the dependency.
• It’s used to inject the thing.
• It’s used to inject the thing reference.
• Dependency Injection is a design sample.

public class Model{
   non-public int id;
   non-public String title;

   @Autowired
   public Model(int id, String title){
     this.id = id;
     this.title = title;
   }
}

@Controller :

• Class Stage Annotation
• It’s a marker interface.
• It’s a controller layer.
• It’s used to create a controller layer.
• It use with @RequestMapping annotation.

@Controller
@RequestMapping("/api/manufacturers")
public class BrandsController{
   @GetMapping("/getall")
   public Worker getAll(){
       return brandService.getAll();
   }
}

@RequestMapping :

• Methodology Stage Annotation
• It’s used to map the HTTP request with particular methodology.

@Controller
@RequestMapping("/api/manufacturers")
public class BrandsController{
   @GetMapping("/getall")
   public Worker getAll(){
       return brandService.getAll();
   }
}

@GetMapping :

• Methodology Stage Annotation
• It’s used to map the HTTP GET request with particular methodology.
• It’s used to get the info.
• It’s used to learn the info.

  @GetMapping("/getall")
  public Worker getAll(){
      return brandService.getAll();
  }

@PostMapping :

• Methodology Stage Annotation
• It’s used to map the HTTP POST request with particular methodology.
• It’s used so as to add the info.
• It’s used to create the info.

  @PostMapping("/add")
  public void add(@RequestBody Model model){
      brandService.add(model);
  }

@PutMapping :

• Methodology Stage Annotation
• It’s used to map the HTTP PUT request with particular methodology.
• It’s used to replace the info.

  @PutMapping("/replace")
  public void replace(@RequestBody Model model){
      brandService.replace(model);
  }

@DeleteMapping :

• Methodology Stage Annotation
• It’s used to map the HTTP DELETE request with particular methodology.
• It’s used to delete the info.

  @DeleteMapping("/delete")
  public void delete(@RequestBody Model model){
      brandService.delete(model);
  }

@PathVariable :

• Methodology Stage Annotation
• It’s used to get the info from the URL.
• It’s the best suited for RESTful internet service that comprises a path variable.

  @GetMapping("/getbyid/{id}")
  public Model getById(@PathVariable int id){
      return brandService.getById(id);
  }

@RequestBody:

• It’s used to get the info from the request physique.
• It’s used to get the info from the HTTP request.
• It’s used to get the info from the HTTP request physique.

  @PostMapping("/add")
  public void add(@RequestBody Model model){
      brandService.add(model);
  }

@RequestParam:

• It’s used to get the info from the URL.
• It’s used to get the info from the URL question parameters.
• It’s also often called question parameter.

@GetMapping("/getbyid")
public Model getById(@RequestParam int id){
    return brandService.getById(id);
}

@RestController:

• Class Stage Annotation
• It’s a marker interface.
• It’s a controller layer.
• It’s used to create a controller layer.
• It use with @RequestMapping annotation.
• It’s a mixture of @Controller and @ResponseBody annotations.
• @RestController annotation is defined with @ResponseBody annotation.
• @ResponseBody eliminates the necessity to add a remark to each methodology.

@RestController
@RequestMapping("/api/manufacturers")
public class BrandsController{
   @GetMapping("/getall")
   public Worker getAll(){
       return brandService.getAll();
   }
}

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