java调用api接口post请求取出数据

在Java中调用API接口进行POST请求并获取数据，可以使用Java的网络请求库，比如使用Apache HttpClient或者Java原生的HttpURLConnection来实现。

使用Apache HttpClient的示例代码如下：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

public class ApiClient {
    public static void main(String[] args) {
        // 创建HttpClient实例
        CloseableHttpClient httpClient = HttpClients.createDefault();

        try {
            // 构建请求URI
            URI uri = new URIBuilder()
                    .setScheme("http") // 或者https
                    .setHost("api.example.com")
                    .setPath("/endpoint")
                    .build();

            // 创建HttpPost请求
            HttpPost httpPost = new HttpPost(uri);

            // 设置请求参数
            List<NameValuePair> params = new ArrayList<>();
            params.add(new BasicNameValuePair("param1", "value1"));
            params.add(new BasicNameValuePair("param2", "value2"));
            httpPost.setEntity(new UrlEncodedFormEntity(params));

            // 发送请求并获取响应
            HttpResponse response = httpClient.execute(httpPost);

            // 解析响应
            HttpEntity entity = response.getEntity();
            String responseText = EntityUtils.toString(entity);
            System.out.println(responseText);

            // 关闭连接
            EntityUtils.consume(entity);
        } catch (URISyntaxException | IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

这段示例代码使用了Apache HttpClient库发送POST请求，并将请求参数通过`NameValuePair`的方式设置到`HttpPost`对象中。获取到响应后，使用`EntityUtils.toString(entity)`方法将响应内容转换为字符串并打印出来。

你需要根据实际情况修改示例代码中的API地址、请求参数等信息。