Implement REST API with layered architecture and exception handling

Test23-REST/src/main/java/org/sang/controller/PersonController.java

@@ -0,0 +1,48 @@
+package org.sang.controller;
+
+import org.sang.entity.Person;
+import org.sang.service.PersonService;
+import org.springframework.web.bind.annotation.*;
+
+import javax.validation.Valid;
+import java.util.List;
+
+@RestController
+public class PersonController {
+    private final PersonService personService;
+
+    public PersonController(PersonService personService){
+        this.personService = personService;
+    }
+    @RequestMapping("/person")
+    //Http request for displaying all the person on the list
+    @GetMapping
+    public List<Person> getAll(){
+        return personService.displayAll();
+    }
+
+    //Http request for displaying single person by id
+    @GetMapping
+    public Person displayId(Long id){
+        return personService.displayById(id);
+    }
+
+    //Http request for Creating New Person
+    @PostMapping
+    public Person createPerson(@Valid @RequestBody Person person){
+        return personService.createPerson(person);
+
+    }
+
+    //Http request for Updating the Person
+    @PutMapping
+    public Person updatePerson(@Valid @RequestBody Person person , @PathVariable Long id){
+        return personService.updatePerson(person, id);
+    }
+
+    //Http Request for Deleting the Person
+    @DeleteMapping
+    public void deletePerson(@PathVariable Long id){
+        personService.deletePerson(id);
+    }
+}

Test23-REST/src/main/java/org/sang/Person.java → Test23-REST/src/main/java/org/sang/entity/Person.java

@@ -1,8 +1,11 @@
-package org.sang;
+package org.sang.entity;
+
+import org.hibernate.validator.constraints.NotBlank;
 
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
+import javax.validation.constraints.Max;
 
 /**
  * Created by sang on 2017/1/4.
@@ -11,8 +14,10 @@
 public class Person {
     @Id
     @GeneratedValue
+    @NotBlank
     private Long id;
     private String name;
+    @Max(18)
     private Integer age;
     private String address;
 

Test23-REST/src/main/java/org/sang/exception/GlobalClassException.java

@@ -0,0 +1,17 @@
+package org.sang.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalClassException {
+    @ExceptionHandler(PersonNotFoundException.class)
+    ResponseEntity<String> handlePersonNotFoundException(PersonNotFoundException ex){
+        return ResponseEntity
+                .status(HttpStatus.NOT_FOUND)
+                .body(ex.getMessage());
+    }
+
+}

Test23-REST/src/main/java/org/sang/exception/PersonNotFoundException.java

@@ -0,0 +1,7 @@
+package org.sang.exception;
+
+public class PersonNotFoundException extends RuntimeException{
+    public PersonNotFoundException(String message){
+        super(message);
+    }
+}

Test23-REST/src/main/java/org/sang/PersonRepository.java → Test23-REST/src/main/java/org/sang/repository/PersonRepository.java

@@ -1,17 +1,17 @@
-package org.sang;
+package org.sang.repository;
 
+import org.sang.entity.Person;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.repository.query.Param;
 import org.springframework.data.rest.core.annotation.RepositoryRestResource;
 import org.springframework.data.rest.core.annotation.RestResource;
+import org.springframework.stereotype.Repository;
 
 import java.util.List;
 
 /**
  * Created by sang on 2017/1/4.
  */
-@RepositoryRestResource(path = "people")
-public interface PersonRepository extends JpaRepository<Person,Long> {
-    @RestResource(path = "nameStartsWith",rel = "nameStartsWith")
-    List<Person> findByNameStartsWith(@Param("name") String name);
+@Repository
+public interface PersonRepository extends JpaRepository<Person, Long>{
 }

Test23-REST/src/main/java/org/sang/service/PersonService.java

@@ -0,0 +1,46 @@
+package org.sang.service;
+
+import org.sang.entity.Person;
+import org.sang.repository.PersonRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class PersonService {
+    private final PersonRepository personRepository;
+
+    public PersonService (PersonRepository personRepository){
+        this.personRepository = personRepository;
+    }
+
+    //Display All the Person
+    public List<Person> displayAll(){
+        return personRepository.findAll();
+    }
+
+    //Display Person by ID
+    public Person displayById(Long id){
+        return personRepository.findOne(id);
+    }
+
+    //Create New Person
+    public Person createPerson(Person person){
+        return personRepository.save(person);
+    }
+
+    //Update the Existing Person
+    public Person updatePerson(Person updatedPerson, Long id){
+        Person existingPerson = personRepository.findOne(id);
+        existingPerson.setName(updatedPerson.getName());
+        existingPerson.setAddress(updatedPerson.getAddress());
+        existingPerson.setAge(updatedPerson.getAge());
+        return personRepository.save(updatedPerson);
+    }
+
+    //Delete the Existing Person
+    public void deletePerson(Long id){
+        personRepository.delete(id);
+    }
+
+}

Test23-REST/src/main/java/org/sang/Test.java → Test23-REST/src/main/java/org/sang/test/Test.java

@@ -1,4 +1,4 @@
-package org.sang;
+package org.sang.test;
 
 import java.util.Random;
 

Test23-REST/src/main/java/org/sang/Test23RestApplication.java → Test23-REST/src/main/java/org/sang/test/Test23RestApplication.java

@@ -1,4 +1,4 @@
-package org.sang;
+package org.sang.test;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;