httpclient发送post请求案例

Sure! Here's an example of how to send a POST request using HttpClient in Java:

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class HttpClientExample {
    public static void main(String[] args) {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost("http://www.example.com/api/endpoint");

        try {
            // Add request headers
            httpPost.setHeader("Content-Type", "application/json");

            // Add request body
            String requestBody = "{\"key1\":\"value1\", \"key2\":\"value2\"}";
            StringEntity stringEntity = new StringEntity(requestBody);
            httpPost.setEntity(stringEntity);

            // Send the POST request
            HttpResponse response = httpClient.execute(httpPost);

            // Get the response body
            HttpEntity responseEntity = response.getEntity();
            String responseBody = EntityUtils.toString(responseEntity);

            // Print the response body
            System.out.println(responseBody);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

In this example, we're using the Apache HttpClient library to send a POST request to `http://www.example.com/api/endpoint`. We set the request headers, add the request body as a JSON string, and then execute the request using `httpClient.execute(httpPost)`. Finally, we retrieve the response body from the `HttpResponse` object and print it out.

Remember to replace `http://www.example.com/api/endpoint` with the actual URL you want to send the POST request to, and modify the request headers and body according to your requirements.