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java response如何获取

2026-03-23 09:30:59Java

获取 Java 中的 HTTP 响应

在 Java 中，可以通过多种方式获取 HTTP 响应，常见的方法包括使用 HttpURLConnection、HttpClient（Java 11+）或第三方库如 Apache HttpClient 和 OkHttp。

使用 HttpURLConnection

HttpURLConnection 是 Java 标准库提供的 HTTP 客户端工具，适用于简单的 HTTP 请求。

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) throws Exception {
        URL url = new URL("https://example.com/api");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");

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

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String inputLine;
        StringBuilder response = new StringBuilder();

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

        System.out.println("Response Body: " + response.toString());
    }
}

使用 HttpClient（Java 11+）

Java 11 引入了 HttpClient，提供了更现代的 API 支持异步和同步请求。

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) throws Exception {
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://example.com/api"))
                .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println("Response Code: " + response.statusCode());
        System.out.println("Response Body: " + response.body());
    }
}

使用 Apache HttpClient

Apache HttpClient 是一个功能丰富的第三方库，适用于复杂的 HTTP 请求场景。

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class ApacheHttpClientExample {
    public static void main(String[] args) throws Exception {
        CloseableHttpClient client = HttpClients.createDefault();
        HttpGet request = new HttpGet("https://example.com/api");

        CloseableHttpResponse response = client.execute(request);
        System.out.println("Response Code: " + response.getStatusLine().getStatusCode());
        System.out.println("Response Body: " + EntityUtils.toString(response.getEntity()));
        response.close();
        client.close();
    }
}

使用 OkHttp

OkHttp 是 Square 公司开发的轻量级 HTTP 客户端，支持同步和异步请求。

java response如何获取

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class OkHttpExample {
    public static void main(String[] args) throws Exception {
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url("https://example.com/api")
                .build();

        try (Response response = client.newCall(request).execute()) {
            System.out.println("Response Code: " + response.code());
            System.out.println("Response Body: " + response.body().string());
        }
    }
}