用Java怎么实现向某接口发送POST带参请求 参数是对象

您可以使用Java中的HttpClient库，先将对象转换为JSON格式，然后构造HTTP POST请求，将JSON作为请求体发送给接口。基本代码如下：

import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import com.alibaba.fastjson.JSON;

public class HttpPostDemo {
    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("http://www.example.com/api");
        
        // 将对象转换为JSON字符串
        Object obj = new Object();
        String json = JSON.toJSONString(obj);
        
        // 设置请求体
        StringEntity entity = new StringEntity(json, "UTF-8");
        entity.setContentEncoding("UTF-8");
        entity.setContentType("application/json");
        httpPost.setEntity(entity);
        
        httpClient.execute(httpPost);
        httpClient.close();
    }
}

当然，具体实现还需根据接口的具体要求来调整。