使用java，写一段代码，实现通过HttpUtil 调用第三方接口，传入list集合，并实现数据新增

好的，对于您的问题，我会根据您的要求给出一个使用Java编写的代码段，实现通过HttpUtil调用第三方接口，并传入List集合进行新增数据操作。下面是代码：

import java.io.IOException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class HttpUtil {
    public static boolean addData(String url, List<MyData> dataList) {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);

        String json = dataListToJson(dataList);
        StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);

        httpPost.setEntity(entity);
        HttpResponse response;
        try {
            response = httpclient.execute(httpPost);
            HttpEntity responseEntity = response.getEntity();
            if (responseEntity != null) {
                String responseJson = EntityUtils.toString(responseEntity);
                if (responseJson.contains("success")) {
                    return true;
                }
                return false;
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return false;
    }

    private static String dataListToJson(List<MyData> dataList) {
        StringBuilder jsonBuilder = new StringBuilder("[");
        for (MyData data : dataList) {
            jsonBuilder.append("{");
            jsonBuilder.append("\"name\":").append(data.getName()).append(",");
            jsonBuilder.append("\"age\":").append(data.getAge());
            jsonBuilder.append("},");
        }
        jsonBuilder.setCharAt(jsonBuilder.length() - 1, ']');
        return jsonBuilder.toString();
    }
}

class MyData {
    private String name;
    private int age;

    // constructor, getters, setters
    // ...
}

我希望这段代码可以满足您的需求，如果您有任何其他问题或需要，都可以随时向我提出。