https请求发送java代码

在Java中，发送HTTPS请求通常使用`HttpURLConnection`、`OkHttpClient`或者第三方库如`Apache HttpClient`或`Retrofit`等。这里以`HttpURLConnection`为例展示如何发送GET请求：

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

public class Main {
    public static void main(String[] args) throws Exception {
        // 创建URL对象
        URL url = new URL("https://example.com/api/data");

        // 打开连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET"); // 设置请求方法为GET
        connection.setUseCaches(false); // 禁止缓存

        // 添加身份验证信息（如果需要）
        String auth = "username:password";
        byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes()); // 编码成Base64
        connection.setRequestProperty("Authorization", "Basic " + new String(encodedAuth));

        // 连接建立成功，状态码为200表示成功
        if (connection.getResponseCode() == 200) {
            // 读取响应内容
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            System.out.println("Response: " + response.toString());
        } else {
            System.err.println("Request failed with status code: " + connection.getResponseCode());
        }

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