JAVA Response 返回值再拿

在Java中，处理HTTP响应的返回值通常涉及使用库如HttpURLConnection或更现代的库如HttpClient。以下是一个基本的示例，展示了如何发送请求并处理响应：

使用 HttpURLConnection

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpExample {
    public static void main(String[] args) {
        String urlString = "https://api.example.com/data"; // 替换为你的URL
        try {
            URL url = new URL(urlString);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");

            int responseCode = conn.getResponseCode();
            System.out.println("Response Code: " + responseCode);

            if (responseCode == HttpURLConnection.HTTP_OK) { // 200
                BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String inputLine;
                StringBuilder response = new StringBuilder();

                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();

                // 打印响应内容
                System.out.println("Response: " + response.toString());
            } else {
                System.out.println("GET request not worked");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

使用 HttpClient（Java 11及以上）

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

public class HttpClientExample {
    public static void main(String[] args) {
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://api.example.com/data")) // 替换为你的URL
                .build();

        client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
              .thenApply(HttpResponse::body)
              .thenAccept(System.out::println)
              .join();
    }
}

总结

• 上述代码展示了如何发送HTTP GET请求并处理响应。
• HttpURLConnection适用于较旧的Java版本，而HttpClient提供了更简洁和现代的API。
• 根据需求选择合适的库和方法。