Java httpClient连接池支持多线程高并发的实现

Java httpClient是一种开源的基于Http的请求和响应类型，它可以通过连接池技术适用于高并发的请求场景，下面是httpClient连接池支持多线程高并发的实现攻略：

1. 引入依赖

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

2. 创建连接池

import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

public class HttpClientFactory {

    public static CloseableHttpClient create() {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(50);
        cm.setDefaultMaxPerRoute(10);
        return HttpClientBuilder.create().setConnectionManager(cm).build();
    }

}

3. 创建多线程实现方法

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.util.EntityUtils;

import java.io.IOException;

public class HttpClientExample {

    public static void main(String[] args) {
        CloseableHttpClient httpClient = HttpClientFactory.create();
        for (int i = 1; i <= 10; i++) {
            new Thread(new MyThread(httpClient)).start();
        }
    }
}

class MyThread implements Runnable {
    private CloseableHttpClient httpClient;

    public MyThread(CloseableHttpClient httpClient) {
        this.httpClient = httpClient;
    }

    public void run() {
        HttpGet httpGet = new HttpGet("http://localhost:8080");
        try (CloseableHttpResponse response = httpClient.execute(httpGet)) {
            System.out.println(EntityUtils.toString(response.getEntity()));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

上述代码就是使用httpClient连接池的多线程示例，它通过线程池的方式创建多个httpClient，从而实现高并发请求。如果并发请求非常高，可以增加连接池的最大连接数和每个主机的最大连接数来提高效率。

声明：以上示例代码仅供参考，实际使用中还需结合实际业务场景加以改进和调整。