public void isProcessEnd()

    {

        String processInstanceId = "901";

        ProcessInstance pi = processEngine.getRuntimeService()//表示正在执行的流程实例和执行对象

                .createProcessInstanceQuery()//创建流程实例查询

                .processInstanceId(processInstanceId)//使用流程实例ID查询

                .singleResult();

        if(pi==null){

            System.out.println("流程已经结束");

        }

        else{

            System.out.println("流程没有结束");

        }

    }

public void findHistoryTask(){

        String taskAssignee = "张三";

        List<HistoricTaskInstance> list = processEngine.getHistoryService()//与历史数据（历史表）相关的Service

                        .createHistoricTaskInstanceQuery()//创建历史任务实例查询

                        .taskAssignee(taskAssignee)//指定历史任务的办理人

                        .list();

        if(list!=null && list.size()>0){

            for(HistoricTaskInstance hti:list){

                System.out.println(hti.getId()+"    "+hti.getName()+"    "+hti.getProcessInstanceId()+"   "+hti.getStartTime()+"   "+hti.getEndTime()+"   "+hti.getDurationInMillis());

                System.out.println("################################");

            }

        }

    }

public void findHistoryProcessInstance(){

        String processInstanceId = "901";

        HistoricProcessInstance hpi = processEngine.getHistoryService()//与历史数据（历史表）相关的Service

                        .createHistoricProcessInstanceQuery()//创建历史流程实例查询

                        .processInstanceId(processInstanceId)//使用流程实例ID查询

                        .singleResult();

        System.out.println(hpi.getId()+"    "+hpi.getProcessDefinitionId()+"    "+hpi.getStartTime()+"    "+hpi.getEndTime()+"     "+hpi.getDurationInMillis()+"     "+hpi.getEndActivityId());

    }