httpclient 连接池

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;

public class HttpClientPoolExample {
    public static void main(String[] args) {
        // 创建连接池管理器
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
        connectionManager.setMaxTotal(100); // 最大连接数
        connectionManager.setDefaultMaxPerRoute(20); // 每个路由的最大连接数

        // 创建 HttpClient 实例
        CloseableHttpClient httpClient = HttpClients.custom()
                .setConnectionManager(connectionManager)
                .build();

        try {
            HttpGet request = new HttpGet("http://example.com");
            CloseableHttpResponse response = httpClient.execute(request);

            try {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    String result = EntityUtils.toString(entity);
                    System.out.println(result);
                }
            } finally {
                response.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

RequestConfig requestConfig = RequestConfig.custom()
        .setConnectTimeout(5000) // 连接超时时间（毫秒）
        .setSocketTimeout(5000) // 读取超时时间（毫秒）
        .build();

HttpGet request = new HttpGet("http://example.com");
request.setConfig(requestConfig);

try (CloseableHttpResponse response = httpClient.execute(request)) {
    // 处理响应
}

connectionManager.setMaxTotal(200); // 增加最大连接数
connectionManager.setDefaultMaxPerRoute(50); // 增加每个路由的最大连接数