HttpClientStandard.java

package java11.httpclient;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

/**
 * Java 11 HTTP Client API (Standardized)
 * Demonstrates the finalized HTTP Client API
 */
public class HttpClientStandard {
 public static void main(String[] args) {
 
 // Create HTTP Client
 HttpClient client = HttpClient.newBuilder()
 .connectTimeout(Duration.ofSeconds(10))
 .followRedirects(HttpClient.Redirect.NORMAL)
 .build();
 
 // GET Request
 System.out.println("=== GET Request ===");
 HttpRequest getRequest = HttpRequest.newBuilder()
 .uri(URI.create("https://httpbin.org/get"))
 .timeout(Duration.ofSeconds(5))
 .header("User-Agent", "Java 11 HttpClient")
 .GET()
 .build();
 
 try {
 HttpResponse<String> response = client.send(getRequest,
 HttpResponse.BodyHandlers.ofString());
 
 System.out.println("Status Code: " + response.statusCode());
 System.out.println("Headers: " + response.headers().firstValue("content-type"));
 System.out.println("Body length: " + response.body().length());
 } catch (Exception e) {
 System.err.println("Error: " + e.getMessage());
 }
 
 // Async Request
 System.out.println("\n=== Async Request ===");
 client.sendAsync(getRequest, HttpResponse.BodyHandlers.ofString())
 .thenApply(HttpResponse::body)
 .thenAccept(body -> {
 System.out.println("Async response received");
 System.out.println("Body preview: " + body.substring(0, Math.min(100, body.length())));
 })
 .exceptionally(ex -> {
 System.err.println("Async error: " + ex.getMessage());
 return null;
 })
 .join();
 
 // POST Request
 System.out.println("\n=== POST Request ===");
 String jsonBody = "{\"name\":\"John\",\"age\":30}";
 
 HttpRequest postRequest = HttpRequest.newBuilder()
 .uri(URI.create("https://httpbin.org/post"))
 .header("Content-Type", "application/json")
 .POST(HttpRequest.BodyPublishers.ofString(jsonBody))
 .build();
 
 try {
 HttpResponse<String> postResponse = client.send(postRequest,
 HttpResponse.BodyHandlers.ofString());
 
 System.out.println("POST Status: " + postResponse.statusCode());
 System.out.println("POST Response: " + postResponse.body().substring(0, Math.min(200, postResponse.body().length())));
 } catch (Exception e) {
 System.err.println("POST Error: " + e.getMessage());
 }
 }
}