java中怎么调用第三方接口，推送数据

Java调用第三方接口，一般可以使用HttpURLConnection或者HttpClient来实现。下面是一个简单的使用HttpURLConnection调用第三方接口的示例代码：

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

public class HttpUtil {

    /**
     * 发送HTTP GET请求，并返回响应结果
     * @param url 请求地址
     * @return 响应结果
     */
    public static String sendGet(String url) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;
        StringBuilder result = new StringBuilder();
        try {
            URL requestUrl = new URL(url);
            connection = (HttpURLConnection) requestUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            connection.connect();
            if (connection.getResponseCode() == 200) {
                reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
                String line;
                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }
            } else {
                System.out.println("请求失败，状态码：" + connection.getResponseCode());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
                if (connection != null) {
                    connection.disconnect();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return result.toString();
    }

    /**
     * 发送HTTP POST请求，并返回响应结果
     * @param url 请求地址
     * @param params 请求参数
     * @return 响应结果
     */
    public static String sendPost(String url, String params) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;
        StringBuilder result = new StringBuilder();
        try {
            URL requestUrl = new URL(url);
            connection = (HttpURLConnection) requestUrl.openConnection();
            connection.setRequestMethod("POST");
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            connection.setDoOutput(true);
            connection.getOutputStream().write(params.getBytes("UTF-8"));
            connection.connect();
            if (connection.getResponseCode() == 200) {
                reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
                String line;
                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }
            } else {
                System.out.println("请求失败，状态码：" + connection.getResponseCode());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
                if (connection != null) {
                    connection.disconnect();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return result.toString();
    }
}

使用示例：

String url = "http://example.com/api?param1=value1&param2=value2";
String result = HttpUtil.sendGet(url);
System.out.println(result);

String url = "http://example.com/api";
String params = "param1=" + URLEncoder.encode("value1", "UTF-8") + "&param2=" + URLEncoder.encode("value2", "UTF-8");
String result = HttpUtil.sendPost(url, params);
System.out.println(result);

推送数据到第三方接口，一般需要使用POST请求，并在请求体中携带数据。具体实现方式取决于第三方接口的要求，可以使用上面的示例代码进行参考。