java调用第三方接口获取数据

Java调用第三方接口获取数据可以使用Java的HttpURLConnection类或Apache HttpClient库来实现。下面是一个使用HttpURLConnection类的示例代码：

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

public class ApiCaller {
    public static void main(String[] args) throws Exception {
        String apiUrl = "https://api.example.com/data";
        URL url = new URL(apiUrl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Accept", "application/json");

        if (conn.getResponseCode() != 200) {
            throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
        }

        BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));

        String output;
        while ((output = br.readLine()) != null) {
            System.out.println(output);
        }

        conn.disconnect();
    }
}

这段代码向一个名为apiUrl的接口发送HTTP GET请求，并将响应输出到控制台。你可以根据实际情况修改请求方法，请求头等参数。