httpclient post使用https 加连接池的工具类

你可以使用 Apache HttpComponents 中的 HttpClient 来进行 https 请求，并使用连接池来提高性能。下面是一个示例代码：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;

public class HttpsClientUtil {

    private static final int MAX_TOTAL_CONNECTIONS = 200;
    private static final int MAX_PER_ROUTE_CONNECTIONS = 20;
    private static final int CONNECTION_TIMEOUT_MS = 5000;
    private static final int SOCKET_TIMEOUT_MS = 10000;

    private static CloseableHttpClient httpClient;

    static {
        try {
            SSLContext sslContext = SSLContexts.custom().build();
            SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext,
                    new String[]{"TLSv1.2"}, null, SSLConnectionSocketFactory.getDefaultHostnameVerifier());
            Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
                    .register("https", socketFactory)
                    .build();

            PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(registry);
            connectionManager.setMaxTotal(MAX_TOTAL_CONNECTIONS);
            connectionManager.setDefaultMaxPerRoute(MAX_PER_ROUTE_CONNECTIONS);

            RequestConfig requestConfig = RequestConfig.custom()
                    .setConnectTimeout(CONNECTION_TIMEOUT_MS)
                    .setSocketTimeout(SOCKET_TIMEOUT_MS)
                    .build();

            httpClient = HttpClientBuilder.create()
                    .setConnectionManager(connectionManager)
                    .setDefaultRequestConfig(requestConfig)
                    .build();
        } catch (NoSuchAlgorithmException | KeyManagementException | KeyStoreException e) {
            throw new RuntimeException(e);
        }
    }

    public static String post(String url, List<BasicNameValuePair> parameters) throws IOException {
        HttpPost httpPost = new HttpPost(url);

        httpPost.setEntity(new UrlEncodedFormEntity(parameters, StandardCharsets.UTF_8));

        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();

        return EntityUtils.toString(entity, StandardCharsets.UTF_8);
    }
}

使用方法：

List<BasicNameValuePair> parameters = new ArrayList<>();
parameters.add(new BasicNameValuePair("key1", "value1"));
parameters.add(new BasicNameValuePair("key2", "value2"));

String response = HttpsClientUtil.post("https://example.com/api", parameters);

此处仅提供一个简单的示例，实际使用时需要根据具体情况进行调整和扩展。