Restful Web Services with Spring Boot Part I

Restful Web Services with Spring Boot

Step 1 - Initializing a RESTful Services Project with Spring Boot

• start.spring.io

• Provide details:
  • Maven Project, Java, SpringBoot - 2.0.0(SNAPSHOT)
  • Group : com.example.project
  • Artifact : restful-web-services
  • dependencies : Web , DevTools, JPA, H2

• Generate Project

• For any Maven project need to specify a group id and artifact id.

• Spring Initializer creates a Maven Project, puts it in a Zip and downloaded to the downloads folder.

• In eclipse -> Import -> Existing Maven Project

• Load the maven project.
• Maven would download all the dependencies listed in the pom.xml file.

Step 2: Understanding the RESTful services created

• REST is a style of software architecture for distributed hypermedia systems (design resources and how you expose them using HTTP).
• REST makes best use of HTTP.
• Key abstraction is a resource - each resource has a URI. ** (Users (1) - Posts(Many))

• Different RESTful Web services we would create.

1. Retrieve all Users - GET /users
2. Create a User - POST /users
3. Retrieve one User - GET /users/{id} -> /users/1
4. Delete a User - DELETE /users/{id} -> /users/1
5. Retrieve all posts for a User - GET /users/{id}/posts
6. Create posts for a User - POST /users/{id}/posts
7. Retrieve details of a post - GET /users/{id}/posts/{post_id}

Step 3 - Create a HelloWorldBean request

• Class object that in turn returns a String.
• Getter, Setter and toString Method.
• Without a Getter - encounter an error - No converter found for return value of type.