java做post请求

可以使用Java提供的HttpURLConnection类实现POST请求。以下是一段示例代码：

import java.net.*;
import java.io.*;

public class Main {
  public static void main(String[] args) {
    try {
      // 创建URL对象
      URL url = new URL("http://example.com");

      // 创建HttpURLConnection对象
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();

      // 设置请求方法为POST
      conn.setRequestMethod("POST");

      // 设置请求参数
      conn.setDoOutput(true);
      OutputStream os = conn.getOutputStream();
      os.write("param1=value1&param2=value2".getBytes());
      os.flush();
      os.close();

      // 获取响应内容
      InputStream is = conn.getInputStream();
      BufferedReader br = new BufferedReader(new InputStreamReader(is));
      String line;
      StringBuffer response = new StringBuffer();
      while ((line = br.readLine()) != null) {
        response.append(line);
      }
      br.close();
      System.out.println(response.toString());

    } catch (MalformedURLException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}