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java如何+创建request

2026-03-21 23:27:30Java

创建 HTTP 请求的方法

在 Java 中创建 HTTP 请求可以通过多种方式实现，以下是几种常见的方法：

使用 `HttpURLConnection`

HttpURLConnection 是 Java 标准库中用于发送 HTTP 请求的类，适用于简单的请求场景。

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

public class HttpUrlConnectionExample {
    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();
        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.toString());
    }
}

使用 Apache HttpClient

Apache HttpClient 是一个功能更强大的 HTTP 客户端库，适合复杂的请求场景。

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 httpClient = HttpClients.createDefault();
        HttpGet request = new HttpGet("https://example.com/api");

        CloseableHttpResponse response = httpClient.execute(request);
        String responseBody = EntityUtils.toString(response.getEntity());

        System.out.println(responseBody);
        response.close();
        httpClient.close();
    }
}

使用 OkHttp

OkHttp 是一个高效的 HTTP 客户端库，支持同步和异步请求。

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();

        Response response = client.newCall(request).execute();
        System.out.println(response.body().string());
    }
}

使用 Spring RestTemplate

Spring 框架提供的 RestTemplate 简化了 HTTP 请求的发送和处理。

java如何+创建request

import org.springframework.web.client.RestTemplate;

public class RestTemplateExample {
    public static void main(String[] args) {
        RestTemplate restTemplate = new RestTemplate();
        String response = restTemplate.getForObject("https://example.com/api", String.class);
        System.out.println(response);
    }
}