‌1. 使用 HttpURLConnection

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpPostExample {

public static void main(String[] args) {

try {

URL url = new URL("http://example.com/api");

HttpURLConnection connection = (HttpURLConnection) url.openConnection();

// 设置为POST请求并允许输出

connection.setRequestMethod("POST");

connection.setDoOutput(true);

// 设置请求体数据（例如表单格式）

String data = "key1=value1&key2=value2";

byte[] dataBytes = data.getBytes();

// 可选：设置Content-Type

connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

// 写入请求体

OutputStream os = connection.getOutputStream();

os.write(dataBytes); os.flush();

os.close();

// 获取响应

int responseCode = connection.getResponseCode();

System.out.println("Response Code: " + responseCode);

} catch (Exception e) { e.printStackTrace();

} } }

2.使用 Apache HttpClient

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;

public class HttpClientExample {

public static void main(String[] args) {

try (CloseableHttpClient httpClient = HttpClients.createDefault()) {

HttpPost post = new HttpPost("http://example.com/api");

// 设置请求头

post.setHeader("Content-Type", "application/json");

// 设置请求体（JSON格式示例）

String jsonBody = "{\"key1\":\"value1\",\"key2\":\"value2\"}";

post.setEntity(new StringEntity(jsonBody));

// 执行请求并获取响应 //

CloseableHttpResponse response = httpClient.execute(post);

// 处理响应...

} catch (Exception e)

{ e.printStackTrace();

} } }