httpclient 示例

HttpClient是一个常用的HTTP客户端库，它使得在编程中发送HTTP请求和处理响应变得更加方便。以下是一个使用Java的Apache HttpClient库发送GET请求的基本示例：

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
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 {
            // 创建HttpGet对象，指定要访问的URL
            HttpGet httpGet = new HttpGet("https://www.example.com");

            // 发送GET请求
            CloseableHttpResponse response = httpClient.execute(httpGet);

            try {
                // 获取响应状态码
                int statusCode = response.getStatusLine().getStatusCode();
                System.out.println("Status Code: " + statusCode);

                // 获取响应体
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    System.out.println("Response Body: " + EntityUtils.toString(entity));
                } else {
                    System.out.println("No content received.");
                }
            } finally {
                // 关闭响应
                response.close();
            }
        } finally {
            // 关闭HttpClient连接
            httpClient.close();
        }
    }
}