httpclient 单例封装-优快云博客

本文链接：https://blog.youkuaiyun.com/edwardnb/article/details/85124248

本文介绍了如何使用 Java 的 HttpClient 进行单例封装，以提高网络请求的效率和资源利用率。通过创建一个静态内部类实现线程安全的单例，同时展示了如何配置 HttpClient 实例，包括设置超时时间、连接池等关键参数。

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import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
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.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;


/**
 * http client 单例封装
 */
public class SingletonHttpClient {

    private CloseableHttpClient httpclient;

    private RequestConfig requestConfig;

    private static SingletonHttpClient singleton;

    /**
     * 获取实例，并初始化
     */
    public static SingletonHttpClient getInstance() {

        if (null == singleton) {
            synchronized (SingletonHttpClient.class) {
                if (null == singleton) {
                    singleton = new SingletonHttpClient();
                    PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
                    cm.setMaxTotal(1000);
                    singleton.httpclient = HttpClients.custom().setConnectionManager(cm)
                            .disableAutomaticRetries().build();
                    singleton.requestConfig = RequestConfig.custom()
                            .setConnectionRequestTimeout(10000).setSocketTimeout(10000)
                            .setConnectTimeout(10000).build()