Implementing POST Service to Create a Post for a User

In this section, we will enable post-operation to create a post for the specific user.

Step 1: Open the UserJPAResource.java file and create a PostMapping to create a post.

@PostMapping("/jpa/users/{id}/posts")
public ResponseEntity<Object> createUser(@PathVariable int id, @RequestBody Post post)	
{
Optional<User> userOptional= userRepository.findById(id);
if(!userOptional.isPresent())
{
throw new UserNotFoundException("id: "+ id);
}
User user=userOptional.get();	
//map the user to the post
post.setUser(user);
//save post to the database
postRepository.save(post);
//getting the path of the post and append id of the post to the URI 
URI location=ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").buildAndExpand(post.getId()).toUri();
//returns the location of the created post
return ResponseEntity.created(location).build();
}

Step 2: Create a post repository.

PostRepository.java

package com.javatpoint.server.main.user;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface PostRepository extends JpaRepository<Post, Integer>
{

}

Step 3: Open the Postman and send a POST request with the URI http://localhost:8080/jpa/users/102/posts. Under the Body tab, insert the post description.