3. Overview
Spring Boot
● An easy , robust ,faster way to create
production ready spring application
● It is a very opinionated approach of
Spring boot library and third party
application with a motive of starting
an application without much
configuration.
4. Primary Goals of Spring Boot
● A faster way for developers to create
spring application
● Out of the box opinions to provide
defaults for spring and third party
configurations.
● Providing range of non functional
features like health checks, metrics,
embedded servers, security etc
● No code generation and no
requirement of XML configuration
5. Requirements and Prerequisites
As an application
Java Version 8
Maven 3.2 + or Gradle 4
Servlet Container as Tomcat 8.5 /Jetty 9.4
/Undertow 1.3
While proceeding further we do expect that
you have Java version 8, Maven 3.2 or Gradle
As a developer
Knowledge of Java
Good to have prior knowledge of Spring
Framework
11. @RestController
1. Denotes that the class contains request mappings.
2. Automatically serialize and deserialize java object response to Json /XML or any format
whatever is intended.
14. Connecting to database
Creating dataSource
Just tell Spring boot app about which database to connect.
# H2
spring.h2.console.enabled=true
spring.h2.console.path=/h2
# Datasource
spring.datasource.url=jdbc:h2:file:~/user
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
application.properties
15. HTTP POST
● HTTP POST request : Used to create a resource on server.
● Most of the time it’s like creating INSERT(s) at database.
● POST should be used for non-idempotent request, which changes the state of
server.
16. HTTP POST
● HTTP POST request : Used to create a resource on server.
● Most of the time it’s like creating INSERT(s) at database.
● POST should be used for non-idempotent request, which changes the state of
server.
17. HTTP POST
Model
public class User {
private Long id;
private String
firstName;
private String
lastName;
private String email;
//getters and setters
}
Controller
@RequestMapping(path={"/user"}, method=RequestMethod.POST)
public ResponseEntity<Void> add(@RequestBody User
user){
//logic
}
http://localhost:8080/user
{
"firstName":"Ray",
"lastName":"McFallen",
"email":"Ray@codingsaint.com"
}
Request Body in JSON
18. HTTP GET
HTTP GET request : Used to get the information already present on
server/database.
GET request doesn’t change state of server but only fetch the data.
http://localhost:8080/user/1
19. HTTP GET
Model
public class User {
private Long id;
private String
firstName;
private String
lastName;
private String email;
//getters and setters
}
Controller
@RequestMapping(path={"/user/{id}"}, method=RequestMethod.GET)
public ResponseEntity<User> get(@PathVariable ("id")
String id){
//logic
}
http://localhost:8080/user/1
{
"id": 1,
"firstName": "Ray",
"lastName": "McFallen",
"email": "Ray@codingsaint.com"
}
Response Body in JSON
Response as User (JSON) with id
20. HTTP PUT
HTTP PUT request : Used to update an existing resource on server.
PUT should be used for non-idempotent request, which changes the state of
server.
22. HTTP DELETE
HTTP DELETE request : Used to remove/purge an existing resource on server.
DELETE should be used for non-idempotent request, which changes the state of
server.
24. User Information API - Introduction
{
"id": 1,
"firstName": "Ray",
"lastName": "McFallen",
"email": "Ray@codingsaint.com"
}
public class User {
private Long id;
private String firstName;
private String lastName;
private String email;
//getters and setters
}
25. HTTP Status Codes
Status Code Range Description
1XX Informational
2XX Success
3XX Redirect
4XX Client error
5XX Server Error
26. Famous HTTP Codes
200 OK
201 Created
204 No content
301 Moved permanently
400 Bad Request
401 Unauthorized
405 Method not allowed
403 Forbidden access
415 Unsupported Media Type
500 Internal server error
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