HttpClient请求代码案例

HttpClient是Apache HttpComponents库的一部分，用于发送HTTP请求。以下是一个简单的Java示例，展示如何使用HttpClient发送GET和POST请求：

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
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 class HttpClientExample {
    public static void main(String[] args) throws Exception {
        // 创建HttpClient实例
        CloseableHttpClient httpClient = HttpClients.createDefault();

        try {
            // 发送GET请求
            HttpGet get = new HttpGet("http://example.com/api/data");
            HttpResponse response = httpClient.execute(get);
            System.out.println("GET Response: " + response.getStatusLine());

            // 发送POST请求
            HttpPost post = new HttpPost("http://example.com/api/register");
            StringEntity entity = new StringEntity("username=myUser&password=mypassword");
            entity.setContentType("application/x-www-form-urlencoded");
            post.setEntity(entity);

            response = httpClient.execute(post);
            System.out.println("POST Response: " + response.getStatusLine());

        } finally {
            // 关闭连接池以释放资源
            httpClient.close();
        }
    }
}

在这个例子中，我们首先创建了HttpClient实例，然后分别发送了一个GET请求和POST请求。记得处理响应并关闭连接。