本文分享两种方式，一种是使用HttpURLConnection ，另一种是使用 Apache HttpClient

使用 HttpURLConnection 发送 GET 请求：

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;public class GetRequestExample {public static void main(String[] args) {try {URL url = new URL("https://api.example.com/data"); // 替换为你想要发送 GET 请求的 URLHttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("GET");int responseCode = connection.getResponseCode();if (responseCode == HttpURLConnection.HTTP_OK) {BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String inputLine;StringBuffer response = new StringBuffer();while ((inputLine = in.readLine()) != null) {response.append(inputLine);}in.close();System.out.println("Response: " + response.toString());} else {System.out.println("GET request failed");}} catch (Exception e) {e.printStackTrace();}}
}

使用 HttpURLConnection 发送 POST 请求：

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;public class PostRequestExample {public static void main(String[] args) {try {URL url = new URL("https://api.example.com/post_endpoint"); // 替换为你想要发送 POST 请求的 URLHttpURLConnection connection = (HttpURLConnection) url.openConnection();// 设置请求类型为 POSTconnection.setRequestMethod("POST");connection.setDoOutput(true);// 构建请求参数String params = "param1=value1&param2=value2"; // 替换为你的参数// 发送 POST 请求DataOutputStream wr = new DataOutputStream(connection.getOutputStream());wr.writeBytes(params);wr.flush();wr.close();int responseCode = connection.getResponseCode();if (responseCode == HttpURLConnection.HTTP_OK) {BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String inputLine;StringBuffer response = new StringBuffer();while ((inputLine = in.readLine()) != null) {response.append(inputLine);}in.close();System.out.println("Response: " + response.toString());} else {System.out.println("POST request failed");}} catch (Exception e) {e.printStackTrace();}}
}

以上示例使用了 Java 中的 HttpURLConnection 类来发送 GET 和 POST 请求。需要替换 URL 和参数为你实际想要发送请求的地址和数据。

使用 Apache HttpClient 发送 GET 请求：

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;
import org.apache.http.HttpResponse;public class ApacheHttpClientGetExample {public static void main(String[] args) {try (CloseableHttpClient httpClient = HttpClients.createDefault()) {HttpGet request = new HttpGet("https://api.example.com/data"); // 替换为你想要发送 GET 请求的 URLHttpResponse response = httpClient.execute(request);if (response.getStatusLine().getStatusCode() == 200) {String responseBody = EntityUtils.toString(response.getEntity());System.out.println("Response: " + responseBody);} else {System.out.println("GET request failed");}} catch (Exception e) {e.printStackTrace();}}
}

使用 Apache HttpClient 发送 POST 请求：

import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.http.HttpResponse;public class ApacheHttpClientPostExample {public static void main(String[] args) {try (CloseableHttpClient httpClient = HttpClients.createDefault()) {HttpPost request = new HttpPost("https://api.example.com/post_endpoint"); // 替换为你想要发送 POST 请求的 URL// 构建请求参数StringEntity params = new StringEntity("param1=value1&param2=value2"); // 替换为你的参数request.setEntity(params);request.addHeader("content-type", "application/x-www-form-urlencoded");HttpResponse response = httpClient.execute(request);if (response.getStatusLine().getStatusCode() == 200) {String responseBody = EntityUtils.toString(response.getEntity());System.out.println("Response: " + responseBody);} else {System.out.println("POST request failed");}} catch (Exception e) {e.printStackTrace();}}
}