httpUtil组装参数发送post请求

HTTPUtil通常是指用于处理网络请求的工具库，在Java中可能会使用Apache HttpClient、Spring框架的RestTemplate或者是OkHttp等库来实现POST请求并组装参数。以下是使用Apache HttpClient的一个简单示例：

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
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;

public HttpEntity postRequest(String url, String params) {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    try {
        HttpPost httpPost = new HttpPost(url);
        // 将参数转化为StringEntity
        httpPost.setEntity(new StringEntity(params, "application/x-www-form-urlencoded"));
        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");

        // 发送请求
        CloseableHttpResponse response = httpClient.execute(httpPost);

        // 检查响应状态码
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode == 200) {
            HttpEntity entity = response.getEntity(); // 获取响应体
            return entity;
        } else {
            // 处理错误情况...
        }

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            httpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return null; // 或者返回一个异常对象
}

在这个例子中，`url`是你想要发送POST请求的目标地址，`params`是要发送的参数字符串，通常是键值对形式如"key1=value1&key2=value2"。这个函数会创建一个POST请求，设置好参数，并发送到服务器。