前言
定时任务动态管理分为两种方式：
方式一:Web前台配置Trigger触发器(关联Cron)、ThreadPoolTaskScheduler类创建Scheduler方式下进行Schedule调度任务的动态管理
方式二:基于已创建的Schedule调度任务的动态管理，即以组件类 @Scheduled注解声明Schedule调度，在启动程序前一次性初始化，如：
@Component
public class TestTask {
private DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
@Scheduled(cron = "0/2 * * * * ?")
public void robReceiveExpireTask() {
System.out.println(df.format(LocalDateTime.now()) + "测试测试");
}
}缺陷：目前无法在运行期间增加Schedule以及stop、Start、Reset等管理。
一、架构流程图
二、代码实现流程
架构为SpringBoot + Spring + mybatis-plus
1.引入库
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>merak-hyper-automation-boot</artifactId>
<groupId>com.merak.automation</groupId>
<version>1.0.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>automation-quartz</artifactId>
<packaging>jar</packaging>
<repositories>
<repository>
<id>aliyun</id>
<name>aliyun Repository</name>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<dependencies>
<!-- Spring框架基本的核心工具 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
<!-- SpringWeb模块 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- druid数据连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>jakarta.validation</groupId>
<artifactId>jakarta.validation-api</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
</dependency>
<!--引入quartz定时框架-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-quartz</artifactId>
<version>2.2.5.RELEASE</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- 打包跳过测试 -->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>resources目录下文件/application.yml:
spring:
profiles:
active: dev
resources目录下文件/application-dev.yml:
server: port: 12105 servlet: context-path: /automation-quartzmanagement: endpoints: web: exposure: include: '*'# Spring配置spring: resources: static-locations: classpath:/static/,classpath:/templates/ mvc: throw-exception-if-no-handler-found: true static-path-pattern: /** application: name: automation-workflow main: allow-bean-definition-overriding: true # 文件上传 servlet: multipart: # 单个文件大小 max-file-size: 2000MB # 设置总上传的文件大小 max-request-size: 4000MB #json 时间戳统一转换 jackson: date-format: yyyy-MM-dd HH:mm:ss time-zone: GMT+8 aop: proxy-target-class: true autoconfigure: exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure datasource: dynamic: druid: # 全局druid参数，绝大部分值和默认保持一致。(现已支持的参数如下,不清楚含义不要乱设置) # 连接池的配置信息 # 初始化大小，最小，最大 initial-size: 1 min-idle: 1 maxActive: 20 # 配置获取连接等待超时的时间 maxWait: 60000 # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 timeBetweenEvictionRunsMillis: 60000 # 配置一个连接在池中最小生存的时间，单位是毫秒 minEvictableIdleTimeMillis: 300000 validationQuery: SELECT 1 testWhileIdle: true testOnBorrow: false testOnReturn: false # 打开PSCache，并且指定每个连接上PSCache的大小 poolPreparedStatements: true maxPoolPreparedStatementPerConnectionSize: 20 # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙 filters: stat,wall,slf4j # 通过connectProperties属性来打开mergeSql功能；慢SQL记录 connectionProperties: druid.stat.mergeSql\=true;druid.stat.slowSqlMillis\=5000 datasource: master: url: jdbc:mysql://127.0.0.1:3308/merak_dev?characterEncoding=UTF-8&useUnicode=true&useSSL=false username: root password: root driver-class-name: com.mysql.jdbc.Driver#mybatis plus 设置mybatis-plus: mapper-locations: classpath*:com/merak/hyper/automation/persist/**/xml/*Mapper.xml global-config: # 关闭MP3.0自带的banner banner: false db-config: id-type: ID_WORKER_STR # 默认数据库表下划线命名 table-underline: true configuration: log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl# log-impl: org.apache.ibatis.logging.stdout.StdOutImpllogging: level: com.merar.hyper: debug com.merak.hyper.automation.persist.**.mapper: debug org.springframework: warn
2.代码流程
启动MerakQuartzApplication类
package com.merak.hyper.automation;
import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
/**
* @author chenjun
* @version 1.0
* @ClassName: MerakQuartzApplication
* @description: 工单任务调度
* @date 2022/9/22 10:30
*/
@EnableScheduling
@EnableAsync
@MapperScan(basePackages = {"com.merak.hyper.automation.persist.**.mapper"})
@SpringBootApplication(scanBasePackages = {"com.merak.hyper.automation.**"}, exclude = {SecurityAutoConfiguration.class})
public class MerakQuartzApplication {
public static final Logger log = LoggerFactory.getLogger(MerakQuartzApplication.class);
public static void main(String[] args) {
SpringApplication.run(MerakQuartzApplication.class, args);
}
private int taskSchedulerCorePoolSize = 15;
private int awaitTerminationSeconds = 60;
private String threadNamePrefix = "taskExecutor-";
/**
* @description: 实例化ThreadPoolTaskScheduler对象，用于创建ScheduledFuture<?> scheduledFuture
*/
@Bean
public ThreadPoolTaskScheduler threadPoolTaskScheduler() {
ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
taskScheduler.setPoolSize(taskSchedulerCorePoolSize);
taskScheduler.setThreadNamePrefix(threadNamePrefix);
taskScheduler.setWaitForTasksToCompleteOnShutdown(false);
taskScheduler.setAwaitTerminationSeconds(awaitTerminationSeconds);
/**需要实例化线程*/
taskScheduler.initialize();
// isinitialized = true;
log.info("初始化ThreadPoolTaskScheduler ThreadNamePrefix=" + threadNamePrefix + ",PoolSize=" + taskSchedulerCorePoolSize
+ ",awaitTerminationSeconds=" + awaitTerminationSeconds);
return taskScheduler;
}
/**
* @description: 实例化ThreadPoolTaskExecutor对象，管理asyncTask启动的线程，应用类为 ScheduledHelper
*/
@Bean("asyncTaskExecutor")
public Executor taskExecutor() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.setMaxPoolSize(50);
taskExecutor.setQueueCapacity(200);
taskExecutor.setKeepAliveSeconds(60);
taskExecutor.setThreadNamePrefix("asyncTaskExecutor-");
taskExecutor.setWaitForTasksToCompleteOnShutdown(true);
taskExecutor.setAwaitTerminationSeconds(60);
//修改拒绝策略为使用当前线程执行
taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
//初始化线程池
taskExecutor.initialize();
return taskExecutor;
}
}一、启动时项目启动时，加载任务关联的触发器，并全量执行流程。
initLineRunner类：
package com.merak.hyper.automation.Scheduling;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.merak.hyper.automation.persist.entity.AutoTriggerInfo;
import com.merak.hyper.automation.persist.entity.BusWorkflow;
import com.merak.hyper.automation.persist.service.IAutoTriggerInfoService;
import com.merak.hyper.automation.persist.service.IBusWorkflowService;
import com.merak.hyper.automation.util.CommonUtil;
import com.merak.hyper.automation.util.ScheduleUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* 项目启动时，加载数字员工关联的触发器，并全量执行
* @Date: 2020/12/25:16:00
**/
@Component
@Order(1)
public class initLineRunner implements CommandLineRunner {
public static final Logger log = LoggerFactory.getLogger(initLineRunner.class);
private DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
@Autowired
private TaskService taskService;
@Autowired
private IAutoTriggerInfoService triggerInfoService;
@Autowired
private IBusWorkflowService workflowService;
@Override
public void run(String... args) {
log.info("项目启动:加载数字员工关联的触发器信息并全量执行," + df.format(LocalDateTime.now()));
QueryWrapper<BusWorkflow> wrapper = new QueryWrapper<>();
wrapper.eq("wf_type", "3");//3:云托管
wrapper.eq("wf_state", "1");
List<BusWorkflow> busWorkflows = workflowService.list(wrapper);
List<AutoTriggerInfo> triggerInfos = triggerInfoService.list();
if( 0 == busWorkflows.size() || 0 == triggerInfos.size() ){
log.info("数字员工关联的触发器信息不正确，员工记录数:"+busWorkflows.size()+",触发器记录数:"+triggerInfos.size());
}
else{
//数字员工关联的触发器信息
Map<String,AutoTriggerInfo> loadWfidAndTriggerInfo = CommonUtil.loadWfidAndTriggerInfo(busWorkflows,triggerInfos);
Iterator<Map.Entry<String, AutoTriggerInfo>> entries = loadWfidAndTriggerInfo.entrySet().iterator();
while (entries.hasNext()) {
Map.Entry<String, AutoTriggerInfo> entry = entries.next();
String wfId = entry.getKey();
BusWorkflow workflow = busWorkflows.stream().filter( t -> wfId.equals(t.getWfId()) ).findAny().orElse(null);
if( null != workflow ){
ScheduleUtil.start(new ScheduleTask(wfId,String.valueOf(workflow.getWfCreateuserId()),taskService), entry.getValue());
}
}
log.info("数字员工关联的触发器信息全量执行完成，数字员工定时个数:"+loadWfidAndTriggerInfo.size()+","+df.format(LocalDateTime.now()));
}
}
}
核心代码：
```java
ScheduleUtil.start(new ScheduleTask(wfId,String.valueOf(workflow.getWfCreateuserId()),taskService), entry.getValue());Scheduler管理工具类:启动、取消、修改等管理
package com.merak.hyper.automation.util;
import com.merak.hyper.automation.Scheduling.ScheduleTask;
import com.merak.hyper.automation.persist.entity.AutoTriggerInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledFuture;
/**
* @version 1.0
* @ClassName: ScheduleUtil
* @description: Scheduler管理工具类:启动、取消、修改等管理
*/
public class ScheduleUtil {
public static final Logger log = LoggerFactory.getLogger(ScheduleUtil.class);
private static ThreadPoolTaskScheduler threadPoolTaskScheduler = SpringContextUtils.getBean(ThreadPoolTaskScheduler.class);
//存储[数字员工wfI，dScheduledFuture]集合
private static Map<String, ScheduledFuture<?>> scheduledFutureMap = new HashMap<>();
/**
* 启动
*
* @param scheduleTask 定时任务
* @param triggerInfo
*/
public static boolean start(ScheduleTask scheduleTask, AutoTriggerInfo triggerInfo) {
String wfId = scheduleTask.getId();
log.info("启动数字员工"+wfId+"定时任务线程" + scheduleTask.getId());
ScheduledFuture<?> scheduledFuture = threadPoolTaskScheduler.schedule(scheduleTask, new CronTrigger(triggerInfo.getLogicConfig()));
scheduledFutureMap.put(wfId, scheduledFuture);
return true;
}
/**
* 取消
*
* @param scheduleTask 定时任务
*/
public static boolean cancel(ScheduleTask scheduleTask) {
log.info("关闭定时任务线程 taskId " + scheduleTask.getId());
ScheduledFuture<?> scheduledFuture = scheduledFutureMap.get(scheduleTask.getId());
if (scheduledFuture != null && !scheduledFuture.isCancelled()) {
scheduledFuture.cancel(false);
}
scheduledFutureMap.remove(scheduleTask.getId());
return true;
}
/**
* 修改
*
* @param scheduleTask 定时任务
* @param triggerInfo
*/
public static boolean reset(ScheduleTask scheduleTask, AutoTriggerInfo triggerInfo) {
//先取消定时任务
cancel(scheduleTask);
//然后启动新的定时任务
start(scheduleTask, triggerInfo);
return true;
}
}ScheduleTask类：ScheduleTask任务类
package com.merak.hyper.automation.Scheduling;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @version 1.0
* @ClassName: ScheduleTask
* @description: ScheduleTask，关联任务id、用户id和具体执行的TaskService类，实现Runnable类
*/
public class ScheduleTask implements Runnable {
private static final int TIMEOUT = 30000;
private String id;
private String userId;
private TaskService service;
public static final Logger log = LoggerFactory.getLogger(ScheduleTask.class);
public String getId() {
return id;
}
/**
* @param id 任务ID
* @param service 业务类
*/
public ScheduleTask(String id, String userId, TaskService service) {
this.id = id;
this.userId = userId;
this.service = service;
}
@Override
public void run() {
log.info("ScheduleTask-执行数字员工消息的发送,id:"+ this.id + ",用户id:"+userId);
service.work(this.id,this.userId);
}
}/**
* @version 1.0
* @ClassName: TaskService
* @description: TaskService
*/
public interface TaskService {
/**
* 业务处理方法
* @param keyword 关键参数
* @param userId
*/
void work(String keyword,String userId);
}
/**
* @description: TaskService实现类，具体执行定时调度的业务
*/
@Service
public class TaskServiceImpl implements TaskService {
public static final Logger log = LoggerFactory.getLogger(TaskServiceImpl.class);
@Autowired
private IAutoDeviceInfoService deviceInfoService;
@Override
public void work(String wfId,String userId) {
try {
log.info("定时任务：根据数字员工wfId"+ wfId +",用户id:"+userId+"，发送消息...");
//sendRobotMsg(wfId,userId);
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}二、通过WEB配置的变更，动态管理定时任务
ScheduledController类:scheduled Web业务层：启动、取消、修改等管理schedule
调度任务信息变更（如1：Trigger Cron变更 2：任务停止 3：任务新增加等）
package com.merak.hyper.automation.controller;
import com.merak.hyper.automation.common.core.domain.AjaxResult;
import com.merak.hyper.automation.common.core.vo.ScheduledApiVo;
import com.merak.hyper.automation.persist.entity.AutoTriggerInfo;
import com.merak.hyper.automation.persist.service.IAutoTriggerInfoService;
import com.merak.hyper.automation.util.ScheduledHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
/**
* @version 1.0
* @ClassName: ScheduledController
* @description: scheduled Web业务层：启动、取消、修改等管理schedule
*/
@RestController
@RequestMapping("/api/scheduled")
public class ScheduledController {
public static final Logger log = LoggerFactory.getLogger(ScheduledController.class);
@Autowired
private IAutoTriggerInfoService triggerInfoService;
@Autowired
private ScheduledHelper scheduledHelper;
@PostMapping("/add")
public AjaxResult addScheduleds(@RequestBody ScheduledApiVo scheduledApiVo){
AutoTriggerInfo autoTriggerInfo = triggerInfoService.getById(scheduledApiVo.getTriggerId());
scheduledHelper.addScheduleds(scheduledApiVo,autoTriggerInfo);
return AjaxResult.success();
}
@PostMapping("/reset")
public AjaxResult resetScheduleds(@RequestBody ScheduledApiVo scheduledApiVo){
AutoTriggerInfo autoTriggerInfo = triggerInfoService.getById(scheduledApiVo.getTriggerId());
scheduledHelper.resetScheduleds(scheduledApiVo,autoTriggerInfo);
return AjaxResult.success();
}
@PostMapping("/stop")
public AjaxResult stopScheduleds(@RequestBody ScheduledApiVo scheduledApiVo){
AutoTriggerInfo autoTriggerInfo = triggerInfoService.getById(scheduledApiVo.getTriggerId());
scheduledHelper.stopScheduleds(scheduledApiVo);
return AjaxResult.success();
}
}
ScheduledHelper类：对外提供ScheduledHelper管理:创建、变更、停止
```java
package com.merak.hyper.automation.util;
import com.merak.hyper.automation.Scheduling.ScheduleTask;
import com.merak.hyper.automation.Scheduling.TaskService;
import com.merak.hyper.automation.common.core.vo.ScheduledApiVo;
import com.merak.hyper.automation.persist.entity.AutoTriggerInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;
/**
* @version 1.0
* @ClassName: ScheduledHelper
* @description:对外提供ScheduledHelper管理:创建、变更、停止
*/
@Component
public class ScheduledHelper {
public static final Logger log = LoggerFactory.getLogger(ScheduledHelper.class);
/**
* @description: 对外（Web)提供异步的Scheduleds增加操作
*/
@Async("asyncTaskExecutor")
public void addScheduleds(ScheduledApiVo scheduledApiVo, AutoTriggerInfo triggerInfo) {
//addSchedule任务
log.warn("创建原数字员工["+scheduledApiVo.getWfId()+"],同步启动Schedule任务");
TaskService taskService = SpringContextUtils.getBean(TaskService.class);
ScheduleUtil.start(new ScheduleTask(scheduledApiVo.getWfId(), scheduledApiVo.getUserId(), taskService), triggerInfo);
}
@Async("asyncTaskExecutor")
public void resetScheduleds(ScheduledApiVo scheduledApiVo,AutoTriggerInfo triggerInfo) {
//cron值改变，变更Schedule任务
log.warn("数字员工["+scheduledApiVo.getWfId()+"]关联的触发器信息cron值改变，变更Schedule任务");
TaskService taskService = SpringContextUtils.getBean(TaskService.class);
ScheduleUtil.reset(new ScheduleTask(scheduledApiVo.getWfId(), scheduledApiVo.getUserId(), taskService), triggerInfo);
}
@Async("asyncTaskExecutor")
public void stopScheduleds(ScheduledApiVo scheduledApiVo) {
//移除Wfid，停止原Schedule任务
log.warn("原数字员工["+scheduledApiVo.getWfId()+"]无效，同步停止Schedule任务");
TaskService taskService = SpringContextUtils.getBean(TaskService.class);
ScheduleUtil.cancel(new ScheduleTask(scheduledApiVo.getWfId(), scheduledApiVo.getUserId(), taskService));
}
}SpringContextUtils类：
package com.merak.hyper.automation.util;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
* @version 1.0
* @ClassName: SpringContextUtils
* @description: 加载Class对象
*/
@Component
public class SpringContextUtils implements ApplicationContextAware {
private static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
SpringContextUtils.applicationContext = applicationContext;
}
public static Object getBean(String name) {
return applicationContext.getBean(name);
}
public static <T> T getBean(Class<T> requiredType) {
return applicationContext.getBean(requiredType);
}
public static <T> T getBean(String name, Class<T> requiredType) {
return applicationContext.getBean(name, requiredType);
}
public static boolean containsBean(String name) {
return applicationContext.containsBean(name);
}
public static boolean isSingleton(String name) {
return applicationContext.isSingleton(name);
}
public static Class<? extends Object> getType(String name) {
return applicationContext.getType(name);
}
}ScheduledApiVo类：
import java.io.Serializable;
/**
* @version 1.0
* @ClassName: ScheduledApiVo
* @description: scheduled Web业务层Api传递参数Vo类
*/
public class ScheduledApiVo implements Serializable {
private String wfId;
private String userId;
private String triggerId;
//set get 略
}最终：Web端通过发送Http请求 ，调用ScheduledHelper管理类接口，实现Scheduled创建、变更、停止操作
log.info("3:云托管更新启动数字员工操作");
ScheduledApiVo scheduledApiVo = new ScheduledApiVo();
scheduledApiVo.setWfId(wfId);
scheduledApiVo.setUserId(String.valueOf(updateUserId));
scheduledApiVo.setTriggerId(newTriggerInfo.getId());
String webHookBody = JSON.toJSONString(scheduledApiVo);
EmsApiUtil.SendQuartzMessage(url, "add", webHookBody);
******************** 分隔 ************************
public static boolean SendQuartzMessage(String quartzUrl, String method, String webHookBody){
boolean result = false;
try{
//org.apache.httpcomponents.httpclient sendPost，pom依赖如下dependency
String resp = HttpClientUtil.sendPostByJson(quartzUrl+"/"+method, webHookBody,0);
if( "error".equals(resp) || resp.contains("405 Not Allowed")){
log.error("调用任务调度中心消息发送失败,地址:"+quartzUrl);
}
else {
JSONObject jsonObject = JSON.parseObject(resp);
if( "200".equals(String.valueOf(jsonObject.get("code"))) ){
result = true;
}
else{
log.error("调用任务调度中心失败,msg："+String.valueOf(jsonObject.get("msg")));
}
}
}catch (Exception e){
log.error("调用任务调度中心失败,msg："+e.getMessage());
}
return result;
} <dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency> 
