RuntimeService rs = processEngine.getRuntimeService();

//2.创建查询流程实例

ProcessInstanceQuery piq = rs.createProcessInstanceQuery();

//3.获取流程实例ID

String processInstanceId = "1001";

//4.查询是否存在进行中的流程

ProcessInstance pi = piq.processInstanceId(processInstanceId).singleResult();

//5-1.没有说明已经结束

}

//5-2.有说明正在进行

}