更多ruoyi-nbcio功能请看演示系统
gitee源代码地址
前后端代码： https://gitee.com/nbacheng/ruoyi-nbcio
演示地址：RuoYi-Nbcio后台管理系统
更多nbcio-boot功能请看演示系统
gitee源代码地址
后端代码： https://gitee.com/nbacheng/nbcio-boot
前端代码：https://gitee.com/nbacheng/nbcio-vue.git
在线演示（包括H5） ： http://122.227.135.243:9888
这个功能在已办任务里，就是用户可以通过已办任务，而且最好是发起人可以进行任务的收回，收回后可以重新进行业务流程提交。
具体的代码如下，同时在自定义业务提交的时候做一个判断，符合这种情况可以进行提交：
@Override@Transactional(rollbackFor = Exception.class)public R recallProcess(WfTaskBo bo) {// 当前任务 listtaskList<Task> listtask = taskService.createTaskQuery().processInstanceId(bo.getProcInsId()).active().list();if (listtask == null || listtask.size()==0) {throw new FlowableException("流程未启动或已执行完成，无法收回");}if (taskService.createTaskQuery().taskId(listtask.get(0).getId()).singleResult().isSuspended()) {throw new FlowableException("任务处于挂起状态");}List<Task> procInsId = taskService.createNativeTaskQuery().sql("select * from ACT_HI_TASKINST where PROC_INST_ID_ = #{procInsId} ORDER BY START_TIME_ desc").parameter("procInsId", bo.getProcInsId()).list();String processInstanceId = listtask.get(0).getProcessInstanceId();// 获取所有历史任务（按创建时间升序）List<HistoricTaskInstance> hisTaskList = historyService.createHistoricTaskInstanceQuery().processInstanceId(processInstanceId).orderByTaskCreateTime().asc().list();if (CollectionUtil.isEmpty(hisTaskList) || hisTaskList.size() < 2) {log.error("当前流程 【{}】 审批节点 【{}】正在初始节点无法收回", processInstanceId, listtask.get(0).getName());throw new FlowableException(String.format("当前流程 【%s】 审批节点【%s】正在初始节点无法收回", processInstanceId, listtask.get(0).getName()));}// 第一个任务HistoricTaskInstance startTask = hisTaskList.get(0);//若操作用户不是发起人，不能收回if(!StringUtils.equalsAnyIgnoreCase(LoginHelper.getUsername(), startTask.getAssignee())) {throw new FlowableException("操作用户不是发起人，不能收回");}// 当前任务HistoricTaskInstance currentTask = hisTaskList.get(hisTaskList.size() - 1);BpmnModel bpmnModel = repositoryService.getBpmnModel(listtask.get(0).getProcessDefinitionId());// 获取第一个活动节点FlowNode startFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(startTask.getTaskDefinitionKey());// 获取当前活动节点FlowNode currentFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(currentTask.getTaskDefinitionKey());// 临时保存当前活动的原始方向List<SequenceFlow> originalSequenceFlowList = new ArrayList<>(currentFlowNode.getOutgoingFlows());// 清理活动方向currentFlowNode.getOutgoingFlows().clear();// 建立新方向SequenceFlow newSequenceFlow = new SequenceFlow();newSequenceFlow.setId("newSequenceFlowId");newSequenceFlow.setSourceFlowElement(currentFlowNode);newSequenceFlow.setTargetFlowElement(startFlowNode);List<SequenceFlow> newSequenceFlowList = new ArrayList<>();newSequenceFlowList.add(newSequenceFlow);// 当前节点指向新的方向currentFlowNode.setOutgoingFlows(newSequenceFlowList);// 完成当前任务for(Task task : listtask) {taskService.addComment(task.getId(), listtask.get(0).getProcessInstanceId(),FlowComment.RECALL.getType(), "发起人收回");taskService.setAssignee(task.getId(), startTask.getAssignee());taskService.complete(task.getId());}// 重新查询当前任务Task nextTask = taskService.createTaskQuery().processInstanceId(processInstanceId).singleResult();if (ObjectUtil.isNotNull(nextTask)) {taskService.setAssignee(nextTask.getId(), startTask.getAssignee());//taskService.complete(nextTask.getId());;//跳过流程发起节点}//自定义业务处理idString dataId = bo.getDataId();if(StringUtils.isNotEmpty(dataId)) {WfMyBusiness business = wfMyBusinessService.getByDataId(dataId);//更新删除自定义业务任务关联表与流程历史表，以便可以重新发起流程。if (business != null) {business.setActStatus(ActStatus.recall);business.setTodoUsers("");business.setDoneUsers("");business.setProposer("");business.setTaskName("");business.setTaskId("");business.setTaskNameId("");wfMyBusinessService.updateById(business);} }// 删除运行和历史的节点信息 this.deleteActivity(procInsId.get(1).getTaskDefinitionKey(), bo.getProcInsId(), dataId);// 恢复原始方向currentFlowNode.setOutgoingFlows(originalSequenceFlowList);return R.ok("发起人收回成功");}try {LambdaQueryWrapper<WfMyBusiness> wfMyBusinessLambdaQueryWrapper = new LambdaQueryWrapper<>();wfMyBusinessLambdaQueryWrapper.eq(WfMyBusiness::getDataId, dataId);WfMyBusiness business = wfMyBusinessService.getOne(wfMyBusinessLambdaQueryWrapper);if (business==null || (business != null && business.getActStatus().equals(ActStatus.stop)) || (business != null && business.getActStatus().equals(ActStatus.recall))){if(processDefinition==null) {return R.fail("自定义表单也没关联流程定义表,流程没定义关联自定义表单"+wfCustomForm.getId());}boolean binit = wfCommonService.initActBusiness(wfCustomForm.getBusinessName(), dataId, serviceName, processDefinition.getKey(), processDefinition.getId(), wfCustomForm.getRouteName());if(!binit) {return R.fail("自定义表单也没关联流程定义表,流程没定义关联自定义表单"+wfCustomForm.getId());}WfMyBusiness businessnew = wfMyBusinessService.getOne(wfMyBusinessLambdaQueryWrapper);//流程实例关联初始化结束if (StrUtil.isNotBlank(businessnew.getProcessDefinitionId())){return this.startProcessByDefId(businessnew.getProcessDefinitionId(),variables);}return this.startProcessByDefKey(businessnew.getProcessDefinitionKey(),variables);}else {return R.fail("已经存在这个dataid实例，不要重复申请："+dataId);}} catch (Exception e) {e.printStackTrace();throw new RuntimeException();} 
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