java调用第三方接口获取数据

Java可以使用多种方式调用第三方接口获取数据，其中常用的方式是使用HttpURLConnection或HttpClient类库进行网络请求。

使用HttpURLConnection发送HTTP请求：

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

public class HttpUrlConnectionDemo {
    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();
        }
    }
}

使用HttpClient发送HTTP请求：

import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class HttpClientDemo {
    public static void main(String[] args) {
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpGet httpGet = new HttpGet("https://api.example.com/data");
            String responseBody = httpClient.execute(httpGet, response -> {
                int status = response.getStatusLine().getStatusCode();
                if (status >= 200 && status < 300) {
                    return EntityUtils.toString(response.getEntity());
                } else {
                    throw new Exception("Unexpected response status: " + status);
                }
            });
            System.out.println(responseBody);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上示例代码仅供参考，实际使用时需要根据接口文档和具体需求进行调整。