java 调用http post请求

在Java中，你可以使用多种库来发送HTTP POST请求，其中最常用的是`java.net.HttpURLConnection`或者第三方库如`Apache HttpClient`、`OkHttp`等。这里我们提供一个简单的示例，使用`HttpURLConnection`：

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

public classHttpPostExample {
    public static void main(String[] args) throws Exception {
        String url = "https://example.com/api/endpoint"; // 替换为你实际的URL
        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
        
        // 设置POST请求
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

        // 发送数据（这里以JSON为例）
        String jsonData = "{\"key\":\"value\"}"; // JSON字符串，替换为你的实际数据
        OutputStream os = connection.getOutputStream();
        os.write(jsonData.getBytes());
        os.flush();
        os.close();

        // 读取响应
        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            try (InputStreamReader reader = new InputStreamReader(connection.getInputStream())) {
                System.out.println(reader.readLine());
            }
        } else {
            System.err.println("Error: " + responseCode);
        }

        // 关闭连接
        connection.disconnect();
    }
}