java实现Post请求请求参数包括url、entity、header请求返回结果为Response对象

以下是一个Java实现Post请求的示例代码：

import java.io.IOException;
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;
import org.apache.http.util.EntityUtils;

public class PostRequestExample {
    public static void main(String[] args) {
        String url = "https://example.com/api";
        String requestBody = "{\"name\":\"John\",\"age\":30}";
        String contentType = "application/json";
        String authorization = "Bearer token123";

        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);

        // 设置请求头
        httpPost.setHeader("Content-Type", contentType);
        httpPost.setHeader("Authorization", authorization);

        // 设置请求体
        StringEntity stringEntity = new StringEntity(requestBody, "UTF-8");
        httpPost.setEntity(stringEntity);

        try {
            CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity responseEntity = httpResponse.getEntity();
            String responseString = EntityUtils.toString(responseEntity);
            System.out.println(responseString);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

在这个例子中，我们使用了Apache HttpComponents库来发送Post请求。我们首先创建一个CloseableHttpClient对象，然后定义HttpPost对象，并设置请求头和请求体。最后，我们使用httpClient.execute（）方法发送请求并获取响应。响应是一个CloseableHttpResponse对象，我们可以从中获取响应实体并将其转换为字符串。最后，我们关闭httpClient对象