Java_Integration_with_REST_APIs. Java_Integration_with_REST_APIsJava_Integration_with_REST_APIsJava_Integration_with_REST_APIsJava_Integration_with_REST_APIsJava_Integration_with_REST_APIs

1. Java Integration with REST APIs
Java Developer Presentation

2. What is an API?
• Application Programming Interface
• Allows communication between software
components
• REST APIs are HTTP-based APIs

3. REST Principles
• Stateless, Cacheable, Client-Server
architecture
• Methods: GET, POST, PUT, DELETE
• Resources identified by URIs

4. Java HTTP Clients
• HttpURLConnection (oldest)
• Apache HttpClient (robust, flexible)
• HttpClient from Java 11 (modern)

5. Consuming REST APIs
• Sending requests and reading responses
• Setting headers, parameters
• Handling HTTP status codes

6. JSON Parsing in Java
• Using Jackson: ObjectMapper class
• Using Gson: Gson class
• Mapping JSON to Java objects (POJOs)

7. Error Handling
• Handling HTTP errors gracefully
• Timeouts, IOExceptions
• Retry logic and logging