This will be a story about what I did in the way from nearly zero expreience in Java dev to a expert in this field. I will constantly update the new resources and courses, also references related to the Java dev into this article.
Background knowledge:
- Graduate student from UIT (Computer science)
- Android Dev(mostly in Kotlin)
- Android Dev(basic Java)
- 6 months with Selenium (Python)
- Know basic JS/HTML/CSS (Chrome Extension
- Basic Ktor (back-end framework)
- Crawl data from multiple websites
- Additional Skills: Sqlite, Github, Linux
Step by step
Go through Java syntax cheat sheet
Completed 20 challenges from 30 days of code-hackerrank
Create my first CRUD app following this short tutorial
Short article, REST hello world
- (Have to pay for pro lessons) Involve into the beginner course Building a REST API with Spring Boot
- Spring and Spring boot
- API contract & Json
- Test first - TDD (Red, Green, Refactor)
- Request and Response
- Spring controller and mapping, path variable
- TestRestTemplate & ResponseEntity -> test in local
- CrudRepository and in-memory database(H2)
- Spring Auto Configuration automatically starts configure H2 database -> base on CrudRepository
- Create Repository from CrudRepository<Data,Id>
- Can use function from interface repository to get the data
- Automatically executed the sql in
test/resourcesin run test - The test will run even the fact that CashCardController required a bean of type ‘CashCardRepository’ that could not be found.
- Idempotent operation -> the responses are the same for any request
- HTTP response (status code + header)
- Pagination in API response & sorted order ->
PagingAndSortingRepositoryPageRequestSort - Spring Security and authentication with Filter chain
- Authentication and Authorization -> Role-Based Access Control
- Same Origin Policy -> scripts which are contained in a web page are allowed to send requests to the origin
- Cross-Origin Request Sharing (CORS) -> explicitly allow a list of “allowed origins
- Cross-Site Request Forgery -> CSRF Token (unique token is generated on each request)
- Cross-Site Scripting (XSS) -> escape the special characters
- Official course Spring with Kotlin
- Initializr HTTP API
- Maven/Gradle -> plugins, dependencies
- Set up
application.properties - Understanding generated application -> Application with main{runApplication}
- Writing controller to handle request(Http, Html)
- Using
mustacheto configure HTML repsonse (ui.Model) - Junit5 @BerforeAll @AfterAll TestRestTemplate
- Create custom extension function
- Persist data with JPA -> allOpen plugin
- Create entity @GeneratedValue, @ManyToOne
- Extend interface CrudRespository
- DataJpaTest with TestEntityManager
- Use model to render the webpage
- Data initialization to a new BlogConfiguration -> @Bean
ApplicationRunner{} - Intefrattion test with @SpringBootTest
- @WebMvcTest @ExtendWith() @ContextConfiguration @MockkBean
- Configure the properites -> @ConfigurationProperties(“blog”)
- @EnableConfigurationProperties(BlogProperties::class) & application.properties
- custom properties
application.properties
- Building REST services with Spring
- A simple payroll service that manages the employees of a company
- H2 in-memory database & JPA
- Spring MVC layer
- By extending EmployeeRepository from JpaRepository/CrudRepository -> CRUD
- @SpringBootApplication: meta-annotation that pulls in component scanning, autoconfiguration, and property support
- Preload with @Configuration and @Bean of
CommandLineRunner-> automatically run those commands/types - @GetMapping, @PostMapping, @PutMapping and @DeleteMapping
- @ControllerAdvice -> to redner HTTP response message
- What makes something RESTful: pretty url + get,post,put + crud -> still NOT enough
- If the engine of application state (and hence the API) is not being driven by hypertext, then it cannot be RESTful and cannot be a REST -> use
LinkBuildersuch as:HATEOAS. Then will response not only the data but_link!!!Not useful from my current view - @Component annotation, the assembler will be automatically created when the app starts.
- Never delete a column in a database. — Unknown
- Insert(a:A,b:B,c:C) or insert(o: Object)
- GIVE UP ON THIS ARTICLE
- Go through Spring start here