项目地址	https://gitee.com/lwj/flowable.git
代码分支	flowable-base
视频讲解地址	https://www.bilibili.com/video/av78779999/

用户名	密码
0000001	test
0000002	test
0000003	test
0000004	test

1. 场景

驳回：当前处理人可以驳回历史走过的任何一个节点
1、驳回任意普通节点
2、驳回多实例节点
3、驳回并行网关节点
4、驳回子流程节点
5、子流程节点驳回主流程节点

实际情况中，为了获取可驳回的节点列表，我们做了一些规定，比方说并行网关节点，要求必须成对出现，也只能驳回到并行网关节点的 fork节点

2. 演示

由于情况很多，截图反而不能重点讲述驳回的事情，这里只截一张图，如果想看详情请查看视频里面的讲解

3. 代码分享

3.1. 获取可驳回节点

public List<FlowNodeVo> getBackNodesByProcessInstanceId(String taskId,String processInstanceId) {List<FlowNodeVo> backNods = new ArrayList<>();TaskEntity taskEntity = (TaskEntity) taskService.createTaskQuery().taskId(taskId).singleResult();String currActId = taskEntity.getTaskDefinitionKey();//获取运行节点表中usertaskString sql = "select t.* from act_ru_actinst t where t.ACT_TYPE_ = 'userTask' " +" and t.PROC_INST_ID_=#{processInstanceId} and t.END_TIME_ is not null ";List<ActivityInstance> activityInstances = runtimeService.createNativeActivityInstanceQuery().sql(sql).parameter("processInstanceId", processInstanceId).list();//获取运行节点表的parallelGateway节点并出重sql = "SELECT t.ID_, t.REV_,t.PROC_DEF_ID_,t.PROC_INST_ID_,t.EXECUTION_ID_,t.ACT_ID_, t.TASK_ID_, t.CALL_PROC_INST_ID_, t.ACT_NAME_, t.ACT_TYPE_, " +" t.ASSIGNEE_, t.START_TIME_, max(t.END_TIME_) as END_TIME_, t.DURATION_, t.DELETE_REASON_, t.TENANT_ID_" +" FROM  act_ru_actinst t WHERE t.ACT_TYPE_ = 'parallelGateway' AND t.PROC_INST_ID_ = #{processInstanceId} and t.END_TIME_ is not null" +" and t.ACT_ID_ <> #{actId} GROUP BY t.act_id_";List<ActivityInstance> parallelGatewaies = runtimeService.createNativeActivityInstanceQuery().sql(sql).parameter("processInstanceId", processInstanceId).parameter("actId", currActId).list();//排序if (CollectionUtils.isNotEmpty(parallelGatewaies)) {activityInstances.addAll(parallelGatewaies);activityInstances.sort(Comparator.comparing(ActivityInstance::getEndTime));}//分组节点int count = 0;Map<ActivityInstance, List<ActivityInstance>> parallelGatewayUserTasks = new HashMap<>();List<ActivityInstance> userTasks = new ArrayList<>();ActivityInstance currActivityInstance = null;for (ActivityInstance activityInstance : activityInstances) {if (BpmnXMLConstants.ELEMENT_GATEWAY_PARALLEL.equals(activityInstance.getActivityType())) {count++;if (count % 2 != 0) {List<ActivityInstance> datas = new ArrayList<>();currActivityInstance = activityInstance;parallelGatewayUserTasks.put(currActivityInstance, datas);}}if (BpmnXMLConstants.ELEMENT_TASK_USER.equals(activityInstance.getActivityType())) {if (count % 2 == 0) {userTasks.add(activityInstance);} else {if (parallelGatewayUserTasks.containsKey(currActivityInstance)) {parallelGatewayUserTasks.get(currActivityInstance).add(activityInstance);}}}}//组装人员名称List<HistoricTaskInstance> historicTaskInstances = historyService.createHistoricTaskInstanceQuery().processInstanceId(processInstanceId).finished().list();Map<String, List<HistoricTaskInstance>> taskInstanceMap = new HashMap<>();List<String> userCodes = new ArrayList<>();historicTaskInstances.forEach(historicTaskInstance -> {userCodes.add(historicTaskInstance.getAssignee());String taskDefinitionKey = historicTaskInstance.getTaskDefinitionKey();if (taskInstanceMap.containsKey(historicTaskInstance.getTaskDefinitionKey())) {taskInstanceMap.get(taskDefinitionKey).add(historicTaskInstance);} else {List<HistoricTaskInstance> tasks = new ArrayList<>();tasks.add(historicTaskInstance);taskInstanceMap.put(taskDefinitionKey, tasks);}});//组装usertask的数据List<User> userList = identityService.createUserQuery().userIds(userCodes).list();Map<String, String> activityIdUserNames = this.getApplyers(processInstanceId, userList, taskInstanceMap);if (CollectionUtils.isNotEmpty(userTasks)) {userTasks.forEach(activityInstance -> {FlowNodeVo node = new FlowNodeVo();node.setNodeId(activityInstance.getActivityId());node.setNodeName(activityInstance.getActivityName());node.setEndTime(activityInstance.getEndTime());node.setUserName(activityIdUserNames.get(activityInstance.getActivityId()));backNods.add(node);});}//组装会签节点数据if (MapUtils.isNotEmpty(taskInstanceMap)) {parallelGatewayUserTasks.forEach((activity, activities) -> {FlowNodeVo node = new FlowNodeVo();node.setNodeId(activity.getActivityId());node.setEndTime(activity.getEndTime());StringBuffer nodeNames = new StringBuffer("会签:");StringBuffer userNames = new StringBuffer("审批人员:");if (CollectionUtils.isNotEmpty(activities)){activities.forEach(activityInstance -> {nodeNames.append(activityInstance.getActivityName()).append(",");userNames.append(activityIdUserNames.get(activityInstance.getActivityId())).append(",");});node.setNodeName(nodeNames.toString());node.setUserName(userNames.toString());backNods.add(node);}});}//去重合并List<FlowNodeVo> datas = backNods.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() ->new TreeSet<>(Comparator.comparing(nodeVo -> nodeVo.getNodeId()))), ArrayList::new));//排序datas.sort(Comparator.comparing(FlowNodeVo::getEndTime));return datas;}

3.2. 驳回代码分享

public ReturnVo<String> backToStepTask(BackTaskVo backTaskVo) {ReturnVo<String> returnVo = null;TaskEntity taskEntity = (TaskEntity) taskService.createTaskQuery().taskId(backTaskVo.getTaskId()).singleResult();//1.把当前的节点设置为空if (taskEntity != null) {//2.设置审批人taskEntity.setAssignee(backTaskVo.getUserCode());taskService.saveTask(taskEntity);//3.添加驳回意见this.addComment(backTaskVo.getTaskId(), backTaskVo.getUserCode(), backTaskVo.getProcessInstanceId(),CommentTypeEnum.BH.toString(), backTaskVo.getMessage());//4.处理提交人节点FlowNode distActivity = flowableBpmnModelService.findFlowNodeByActivityId(taskEntity.getProcessDefinitionId(), backTaskVo.getDistFlowElementId());if (distActivity != null) {if (FlowConstant.FLOW_SUBMITTER.equals(distActivity.getName())) {ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(taskEntity.getProcessInstanceId()).singleResult();runtimeService.setVariable(backTaskVo.getProcessInstanceId(), FlowConstant.FLOW_SUBMITTER_VAR, processInstance.getStartUserId());}}//5.删除节点this.deleteActivity(backTaskVo.getDistFlowElementId(), taskEntity.getProcessInstanceId());List<String> executionIds = new ArrayList<>();//6.判断节点是不是子流程内部的节点if (flowableBpmnModelService.checkActivitySubprocessByActivityId(taskEntity.getProcessDefinitionId(),backTaskVo.getDistFlowElementId())&& flowableBpmnModelService.checkActivitySubprocessByActivityId(taskEntity.getProcessDefinitionId(),taskEntity.getTaskDefinitionKey())){//6.1 子流程内部驳回Execution executionTask = runtimeService.createExecutionQuery().executionId(taskEntity.getExecutionId()).singleResult();String parentId = executionTask.getParentId();List<Execution> executions = runtimeService.createExecutionQuery().parentId(parentId).list();executions.forEach(execution -> executionIds.add(execution.getId()));this.moveExecutionsToSingleActivityId(executionIds,backTaskVo.getDistFlowElementId());}else {//6.2 普通驳回List<Execution> executions = runtimeService.createExecutionQuery().parentId(taskEntity.getProcessInstanceId()).list();executions.forEach(execution -> executionIds.add(execution.getId()));this.moveExecutionsToSingleActivityId(executionIds,backTaskVo.getDistFlowElementId());}returnVo = new ReturnVo<>(ReturnCode.SUCCESS, "驳回成功!");} else {returnVo = new ReturnVo<>(ReturnCode.FAIL, "不存在任务实例,请确认!");}return returnVo;}