java发起http请求代码

Sure, here's an example Java code for sending an HTTP request:

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

public class HTTPRequestExample {
   public static void main(String[] args) throws Exception {
      URL url = new URL("http://example.com"); // URL to send request to
      HttpURLConnection con = (HttpURLConnection) url.openConnection();
      con.setRequestMethod("GET"); // or "POST" if you want to send POST request
      int responseCode = con.getResponseCode();
      
      BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
      String inputLine;
      StringBuffer response = new StringBuffer();
      while ((inputLine = in.readLine()) != null) {
         response.append(inputLine);
      }
      in.close();
      
      System.out.println("Response code: " + responseCode);
      System.out.println("Response body: " + response.toString());
   }
}

This code sends a GET HTTP request to `http://example.com` and prints out the response code and body. You can modify it to send different types of requests, such as POST requests, by adjusting the `setRequestMethod()` method.