摘要：文件引入請求工具工具發送請求，參數是開始請求參數創建對象創建對象配置請求參數設置參數和請求方式解決中文亂碼問題執行請求異常請求參數，異常信息結束請求參數返回數據異步執行請求和并發測試異步執行請求執行并返回結果模擬并發測試模擬并發

        
            org.apache.httpcomponents
            httpclient
            4.5.3
        

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";
    
    /**
     * 發送POST請求，參數是JSON
     */
    public static String requestPost(String url, String jsonParam){
        logger.info("HttpTool.requestPost 開始 請求url：" + url + ", 參數：" + jsonParam);
        //創建HttpClient對象
        CloseableHttpClient client = HttpClients.createDefault();
        //創建HttpPost對象
        HttpPost httpPost = new HttpPost(url);
        
        //配置請求參數
        RequestConfig requestConfig = RequestConfig.custom()
                .setCookieSpec(CookieSpecs.DEFAULT)
                .setExpectContinueEnabled(true)
                .setSocketTimeout(5000)  
                .setConnectTimeout(5000)  
                .setConnectionRequestTimeout(5000)  
                .build();
        
        httpPost.setConfig(requestConfig);
        
        String respContent = null;
            
        //設置參數和請求方式
        StringEntity entity = new StringEntity(jsonParam,ENCODING);//解決中文亂碼問題    
        entity.setContentEncoding(ENCODING);    
        entity.setContentType(CONTENT_TYPE);  
        
        httpPost.setEntity(entity);
            
        HttpResponse resp;
        try {
            //執行請求
            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 異常 請求url：" + url + ", 參數：" + jsonParam + "，異常信息：" + e);
        }
        logger.info("HttpTool.requestPost 結束 請求url：" + url + ", 參數：" + jsonParam + "");
        //返回數據
        return respContent;
    }
}

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;

/**
 * 異步執行HTTP請求
 */
public class HttpCallable implements Callable {
    
    private String url;
    
    private String jsonParams;
    
    public HttpCallable(String url, String jsonParams){
        this.url = url;
        this.jsonParams = jsonParams;
    }

    /**
     * 執行并返回結果
     */
    @Override
    public String call() throws Exception {
        return HttpTool.requestPost(url, jsonParams);
    }
    
    /**
     * 模擬并發測試
     */
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        //模擬并發數
        int concurrencyNumber = 1000;
        
        List  resList = Lists.newArrayList();
        
        //執行線程池
        ExecutorService ex = Executors.newFixedThreadPool(100);
        
        String url = "www.baidu.com";
        Map mapPatam = new HashMap<>();
        mapPatam.put("name", "測試");
        
        
        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);
        }
    }

}