java的http请求方式调用api

在Java中，可以使用HttpURLConnection或Apache HttpClient等库来进行HTTP请求。下面是使用HttpURLConnection发送GET请求的示例代码：

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

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

            BufferedReader in = new BufferedReader(
                    new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer content = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                content.append(inputLine);
            }
            in.close();

            System.out.println(content.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

其中，URL是API的地址，HttpURLConnection类是Java标准库中的HTTP客户端，setRequestMethod方法设置请求方法，getInputStream方法获取响应流，BufferedReader类读取响应内容。