activiti实现跳转节点的方法

最新推荐文章于 2025-09-14 03:43:41 发布

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本文探讨了两种工作流回退的方法：通过代码实现和通过排他网关。代码实现中详细展示了如何从two节点退回到one节点，涉及历史任务查询、流程图修改及任务完成。而排他网关方案则依赖于特定条件来决定是否退回one节点。注意，代码实现不自动清除流程变量，而网关方式可以自动删除。

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<HistoricTaskInstance> 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<HistoricTaskInstance> 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<HistoricActivityInstance> 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<SequenceFlow> oriSequenceFlows = new ArrayList<>();
        oriSequenceFlows.addAll(curFlowNode.getOutgoingFlows());
        //清理活动方向
        curFlowNode.getOutgoingFlows().clear();
        //建立新方向
        List<SequenceFlow> 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);
        //恢复原方向
        curFlowNode.setOutgoingFlows(oriSequenceFlows);
        return "成功";
    }

对应的流程图如下：