1.通过代码实现，即获取到当前节点，然后退回到已走过的指定节点。代码如下：
@RequestMapping("/returnNode")
public String returnNode(String taskId) {
// 取得当前任务.当前任务节点
HistoricTaskInstance currTask = historyService.createHistoricTaskInstanceQuery().taskId(taskId).singleResult();
// 取得所有历史任务按时间降序排序
List hisInstances = historyService.createHistoricTaskInstanceQuery().processInstanceId(currTask.getProcessInstanceId()).orderByTaskCreateTime().desc().list();
if(ObjectUtils.isEmpty(hisInstances)||hisInstances.size()<2){
return "fail";
}
//目的节点
HistoricTaskInstance lastTask = null;
//所有目的节点的历史记录
List commitList = historyService.createHistoricTaskInstanceQuery().processInstanceId(currTask.getProcessInstanceId()).taskName("one").orderByTaskCreateTime().asc().list();
lastTask=commitList.get(0);
if (null==lastTask){
return "fail";
}
// 目的节点的taskId
String lastTaskId = lastTask.getId();
// 目的节点的executionId
String lastExecutionId = lastTask.getExecutionId();
//目的节点对应的流程定义ID
String processDefinitionId = lastTask.getProcessDefinitionId();
//对应的流程图文件
BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
String lastActivityId = null;
//获取所有和目的节点任务名一样的已完成的历史记录
List finishedList = historyService.createHistoricActivityInstanceQuery().executionId(lastExecutionId).finished().list();
for (HistoricActivityInstance f: finishedList){
if(lastTaskId.equals(f.getTaskId())){
lastActivityId=f.getActivityId();
break;
}
}
FlowNode lastFlowNode = (FlowNode)bpmnModel.getMainProcess().getFlowElement(lastActivityId);
// 取得当前节点的信息
// 当前节点的executionId
String curExecutionId = currTask.getExecutionId();
Execution execution = runtimeService.createExecutionQuery().executionId(curExecutionId).singleResult();
String curActivityId = execution.getActivityId();
FlowNode curFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(curActivityId);
//记录当前节点的原活动方向
List oriSequenceFlows = new ArrayList<>();
oriSequenceFlows.addAll(curFlowNode.getOutgoingFlows());
//清理活动方向
curFlowNode.getOutgoingFlows().clear();
//建立新方向
List newSequenceFlowList = new ArrayList<>();
SequenceFlow newSequenceFlow = new SequenceFlow();
newSequenceFlow.setId("newSequenceFlowId");
newSequenceFlow.setSourceFlowElement(curFlowNode);
newSequenceFlow.setTargetFlowElement(lastFlowNode);
newSequenceFlowList.add(newSequenceFlow);
curFlowNode.setOutgoingFlows(newSequenceFlowList);
// 完成任务
taskService.complete(taskId);
return "成功";
} |
对应的流程图如下：
上述代码可以实现从two节点退回到one节点
2.通过排他网关实现，流程图如下：
通过设置two节点完成时的参数确定流程图是退回到one节点还是结束。
注意，方法一不会自动删除流程中的参数，需要手动删除，如果通过网关退回，可以实现退回后之前的流程变量自动被删除。
