删除流程

删除流程：

 　　　　ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
            HistoryService historyService = engine.getHistoryService();
            RuntimeService runtimeService = engine.getRuntimeService();
流程没有结束： runtimeService.deleteProcessInstance(processInstanceId,"");
               historyService.deleteHistoricProcessInstance(procesInstanceId);(顺序不能换)
流程已经结束：historyService.deleteHistoricProcessInstance(procesInstanceId);