Activiti启动流程实例，runtimeService.startProcessInstanceByKey

/*** 启动流程实例，添加进businessKey** 本质：act_ru_execution表中的businessKey的字段要存入业务标识*/
public class BusinessKeyAdd {
    public static void main(String[] args) {
    //1.得到ProcessEngine对象ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();//2.得到RuntimeService对象RuntimeService runtimeService = processEngine.getRuntimeService();//3.启动流程实例,同时还要指定业务标识businessKey 它本身就是请假单的id//第一个参数：是指流程定义key//第二个参数：业务标识businessKeyProcessInstance processInstance = runtimeService.startProcessInstanceByKey("holiday", "1001");//4.输出processInstance相关的属性,取出businessKey使用:processInstance.getBusinessKey()System.out.println(processInstance.getBusinessKey());}
}