POM文件引入httpclient

            
                
     
      org.apache.httpcomponents
                 
     
      httpclient
                 
     
      4.5.3
             
    

http 请求工具

package com.raytoo.common.toolbox.http;import java.io.IOException;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.config.CookieSpecs;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/** * http 工具 */public class HttpTool {        private static Logger logger = LoggerFactory.getLogger(HttpTool.class);        private static String ENCODING = "UTF-8";        private static String CONTENT_TYPE = "application/json";        /**     * 发送POST请求，参数是JSON     */    public static String requestPost(String url, String jsonParam){        logger.info("HttpTool.requestPost 开始 请求url：" + url + ", 参数：" + jsonParam);        //创建HttpClient对象        CloseableHttpClient client = HttpClients.createDefault();        //创建HttpPost对象        HttpPost httpPost = new HttpPost(url);                //配置请求参数        RequestConfig requestConfig = RequestConfig.custom()                .setCookieSpec(CookieSpecs.DEFAULT)                .setExpectContinueEnabled(true)                .setSocketTimeout(5000)                  .setConnectTimeout(5000)                  .setConnectionRequestTimeout(5000)                  .build();                httpPost.setConfig(requestConfig);                String respContent = null;                    //设置参数和请求方式        StringEntity entity = new StringEntity(jsonParam,ENCODING);//解决中文乱码问题            entity.setContentEncoding(ENCODING);            entity.setContentType(CONTENT_TYPE);                  httpPost.setEntity(entity);                    HttpResponse resp;        try {            //执行请求            resp = client.execute(httpPost);            if(resp.getStatusLine().getStatusCode() == 200) {                HttpEntity responseObj = resp.getEntity();                respContent = EntityUtils.toString(responseObj,"UTF-8");            }        } catch (IOException e) {            e.printStackTrace();            logger.info("HttpTool.requestPost 异常 请求url：" + url + ", 参数：" + jsonParam + "，异常信息：" + e);        }        logger.info("HttpTool.requestPost 结束 请求url：" + url + ", 参数：" + jsonParam + "");        //返回数据        return respContent;    }}

异步执行HTTP请求和并发测试demo

package com.raytoo.common.toolbox.http;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.concurrent.Callable;import java.util.concurrent.ExecutionException;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Future;import com.alibaba.fastjson.JSON;import com.google.common.collect.Lists;/** * 异步执行HTTP请求 */public class HttpCallable implements Callable
    
      {        private String url;        private String jsonParams;        public HttpCallable(String url, String jsonParams){        this.url = url;        this.jsonParams = jsonParams;    }    /**     * 执行并返回结果     */    @Override    public String call() throws Exception {        return HttpTool.requestPost(url, jsonParams);    }        /**     * 模拟并发测试     */    public static void main(String[] args) throws InterruptedException, ExecutionException {        //模拟并发数        int concurrencyNumber = 1000;                List
     
        resList = Lists.newArrayList();                //执行线程池        ExecutorService ex = Executors.newFixedThreadPool(100);                String url = "www.baidu.com";        Map
      
        mapPatam = new HashMap<>();        mapPatam.put("name", "测试");                        for(int i =0 ; i< concurrencyNumber; i++){            Future
       
         callRes = ex.submit(new HttpCallable(url, JSON.toJSONString(mapPatam)));            resList.add(i + ">>>" + callRes.get());        }                for(String s : resList){            System.out.println("------>" + s);        }    }}