Java中的HTTP POST请求详解

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.apache.http.client.ClientProtocolException;
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 HttpPostExample {
    public static void main(String[] args) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("http://your-api-endpoint.com/resource");
 
        try {
            // 设置HTTP头部信息
            httpPost.setHeader("Authorization", "Bearer your-auth-token");
            httpPost.setHeader("Content-Type", "application/json");
 
            // 创建要发送的数据
            String json = "{\"key1\":\"value1\",\"key2\":\"value2\"}";
            StringEntity entity = new StringEntity(json);
            httpPost.setEntity(entity);
 
            // 执行HTTP POST请求
            CloseableHttpResponse response = httpClient.execute(httpPost);
 
            try {
                // 获取响应的状态码和内容
                int statusCode = response.getStatusLine().getStatusCode();
                String responseBody = EntityUtils.toString(response.getEntity());
 
                System.out.println("Status Code: " + statusCode);
                System.out.println("Response Body: " + responseBody);
            } finally {
                response.close();
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

这段代码使用Apache HttpClient库发送一个HTTP POST请求到指定的API端点。它设置了请求头，创建了一个请求实体，并发送了JSON格式的数据。然后它打印出响应的状态码和主体内容。这个例子展示了如何在Java中执行HTTP POST请求的基本流程。