用java发送http get请求

可以使用Java中的HttpURLConnection类来发送HTTP GET请求。以下是示例代码：

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

public class HttpGetExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("https://www.example.com/api/data");
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setRequestMethod("GET");

            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.toString());
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}

这个示例代码会发送一个HTTP GET请求到`https://www.example.com/api/data`，并打印出响应的内容。