java 发无参http请求

要发送无参HTTP请求，你可以使用Java中的HttpURLConnection类或者HttpClient库。下面是使用HttpURLConnection类发送无参GET请求的示例代码：

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

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

        // 打开连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        // 设置请求方法为GET
        connection.setRequestMethod("GET");

        // 发送请求
        int responseCode = connection.getResponseCode();

        // 读取响应
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line;
        StringBuilder response = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            response.append(line);
        }
        reader.close();

        // 输出响应结果
        System.out.println("Response Code: " + responseCode);
        System.out.println("Response Body: " + response.toString());

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

这是一个简单的示例，你可以根据需要进行修改和扩展。记得替换URL为你要发送请求的目标URL。