CloseableHttpClient 连接超时导致XxlJob调度阻塞，影响调度任务的执行

CloseableHttpClient 连接超时导致XxlJob调度阻塞，影响调度任务的执行

问题原因
1.分析日志发现，xxlJob后台界面没有执行时间和执行结果，在某一个时间点之后，某一个任务因为阻塞全部执行失败，影响业务系统未正常进行。比如：定时投保，购买保险等。
2.临时解决：先重启服务，XxlJob恢复调度，可以正常执行任务。
3.优化解决：排查logger日志，发现请求的日志有，返回的日志没有，分析代码发现，CloseableHttpClient未设置超时时间，加上该代码，重新上线。
4.业务数据的拉取，提供给业务方来做线下处理等操作。
5.加上python监控，根据SQL查询业务执行结果，每隔2个小时查询一次，如果没有执行结果，则报警提示。达到监控的目的。

DEMO代码示例：

package com.example.core.mydemo.http.httpclient;

import com.alibaba.fastjson.JSON;
import com.example.core.mydemo.http.CancelOrderReqVO;
import com.example.core.mydemo.http.CancelRenyunOrderReqVO;
import com.example.core.mydemo.json2.GsonUtils;
import org.apache.http.HttpEntity;
import org.apache.http.StatusLine;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
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.springframework.http.HttpStatus;

import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class CloseableHttpTest {

    public static void main(String[] args) throws Exception {
        CancelOrderReqVO data = new CancelOrderReqVO();
        data.setOrderNum("111123333");
        data.setServerType("1");

        //仅仅测试
        String url = "http://www.baidu.com";

        String jsonParam = GsonUtils.toJson(data);
        System.out.println("调用外部接口入参jsonParam:{}" + jsonParam);
        String resJson = doPost(url,jsonParam);
        System.out.println("调用外部接口返回：{}" + resJson);

    }
    static String doPost(String url, String params) throws Exception {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);// 创建httpPost
        System.out.println("请求url:"+url+",param:" + JSON.toJSONString(params));
        httpPost.setHeader("Accept", "application/json;charset=utf-8");
        httpPost.setHeader("Content-Type", "application/json;charset=utf-8");
        String charSet = "UTF-8";
        StringEntity entity = new StringEntity(params, charSet);
        httpPost.setEntity(entity);
        //设置超时时间【关键】
        // 设置连接超时时间（毫秒）
        int connectTimeout = 10000;
        // 设置读取超时时间（毫秒）
        int socketTimeout = 10000;
        // 设置从连接池中获取连接的超时时间（毫秒）
        int connectionRequestTimeout = 10000;
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).setConnectionRequestTimeout(connectionRequestTimeout).build();
        httpPost.setConfig(requestConfig);

        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httpPost);
            StatusLine status = response.getStatusLine();
            int state = status.getStatusCode();
            if (state == HttpStatus.OK.value()) {
                HttpEntity responseEntity = response.getEntity();
                String jsonString = EntityUtils.toString(responseEntity);
//                return new String(jsonString.getBytes(),"UTF-8");
                return jsonString;
            } else{
                //logger.error("请求返回:"+state+"("+url+")");
            }
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            try {
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}