URL and URI
Description
A URI identifies a resource and a URL provides its location.
Explanation
Java's URI class validates and represents a resource identifier.
Example
java.net.URI uri = java.net.URI.create("https://example.com");← Chapter 10 — Threads, Networking & JDBC
35. Networking Basics
mixed
Description
Networking lets Java programs communicate with other machines and web services. URLs identify resources, while HTTP describes a common request-and-response protocol.
Modern Java provides HttpClient for HTTP requests. Network calls can fail or take time, so production programs need timeouts, validation, and careful error handling.
Subtopics
HTTP client
Description
HttpClient sends HTTP requests.
Explanation
A request includes a URI and a response contains status and body.
Example
java.net.http.HttpRequest.newBuilder(uri).GET().build();Explanation
Never assume a successful response. Check status codes and treat remote data as untrusted input before using it in your program.
Example
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
public class NetworkDemo {
public static void main(String[] args) {
HttpRequest request = HttpRequest.newBuilder(URI.create("https://example.com")).GET().build();
System.out.println(request.uri());
}
}Key points
- HTTP uses requests and responses.
- URI represents a resource identifier.
- Network calls can fail or time out.