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Activit的心路历程：获取当前节点的下一节点【可能存在多个】的nodeId

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07/31
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上一任务节点

在我的开发任务中，突然给我提出了一个待办任务需要获取当前任务节点下一任务节点的表单信息，刚开始搞得我有点措手不及，后来仔细是靠后，灵感一下，直接操作流程的bpmn信息就可以获取到节点信息嘛，顺着这个思路，我整理出了自己的思路：

（1）将节点大体分为两类，一类是网关节点，另外一类就是用户任务节点，使用List集合，将网关与用户任务进行分类

（2）获取上一节点，我们就需要从bpmn的连线信息入手，这次我们获取的是UserTask节点的出线，固定连线的sourceRef，辨别节点targtaetRef的类型，当是用户任务时，放进 List behildNodeIdlist= new ArrayList<>();，当是GateWay节点时，将sourceRef设为网关的，继续遍历下一节点，就是跳过网关节点，只要用户任务节点

@Test
public void behindNode() {
// String nodeId="UserTask_0mkm9h7";
String nodeId = "UserTask_0mkm9h7";
String processInstanceId="2205001";
//网关集合
List<Gateway> gateways = new ArrayList<>();
//用户任务集合
List<UserTask> userTasks = new ArrayList<>(); //网关节点id
List<String> gatewayNodelIdList = new ArrayList<>();
//用户任务节点id
List<String> usertaskNodelIdList = new ArrayList<>(); ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
String processDefinitionId = processInstance.getProcessDefinitionId();
//ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().processDefinitionId(processDefinitionId).singleResult();
BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
List<Process> processes = bpmnModel.getProcesses();
Process process = processes.get(0);
Collection<FlowElement> flowElements = process.getFlowElements();
//将网关信息与用户任务进行分类存储（放于JVM堆中）
flowElements.forEach(flowElement -> {
if (flowElement instanceof Gateway) {
gatewayNodelIdList.add(flowElement.getId());
gateways.add((Gateway) flowElement);
}
if (flowElement instanceof UserTask) {
usertaskNodelIdList.add(flowElement.getId());
userTasks.add((UserTask) flowElement);
}
}); //存放下一节点的nodeId（可能存在多个）
List<String> behildNodeIdlist = new ArrayList<>(); //变量所有的UserTask节点
for (UserTask userTask : userTasks) {
//获取UserTask节点的出线
List<SequenceFlow> outgoingFlows = userTask.getOutgoingFlows();
for (SequenceFlow outgoingFlow : outgoingFlows) {
String sourceRef = outgoingFlow.getSourceRef();
String targetRef = outgoingFlow.getTargetRef();
//固定出线的（sourceRef）
if (nodeId.equals(sourceRef)) {
//当前节点的下一节点是网关,跳过
if (gatewayNodelIdList.contains(targetRef)) {
for (Gateway gateway : gateways) {
//获取网关的出线信息
List<SequenceFlow> outgoingFlowsGateWay = gateway.getOutgoingFlows();
for (SequenceFlow sequenceFlow : outgoingFlowsGateWay) {
String sourceRefGateWay = sequenceFlow.getSourceRef();
String targetRefGateWay = sequenceFlow.getTargetRef();
//定sourceRefGateWay
if (targetRef.equals(sourceRefGateWay)) {
behildNodeIdlist.add(targetRefGateWay);
}
}
}
} else {
behildNodeIdlist.add(targetRef);
}
}
} } behildNodeIdlist.forEach(System.out::println);
}

我使用的测试流程bpmn如下

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://activiti.org/bpmn">
<process id="Process_1" name="1023后台设计器测试数据HH" isExecutable="true">
<startEvent id="StartEvent_1b9bgjv" name="start"></startEvent>
<userTask id="UserTask_1wba62u" name="faqi" activiti:assignee="wuniting">
<extensionElements>
<modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
</extensionElements>
</userTask>
<sequenceFlow id="SequenceFlow_1fnj22n" sourceRef="StartEvent_1b9bgjv" targetRef="UserTask_1wba62u"></sequenceFlow>
<parallelGateway id="ParallelGateway_0g393ev"></parallelGateway>
<userTask id="UserTask_1nt87by" name="tb1" activiti:assignee="wuniting">
<extensionElements>
<modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
</extensionElements>
</userTask>
<userTask id="UserTask_1xty4gu" name="tb2" activiti:assignee="zhangmiao">
<extensionElements>
<modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
</extensionElements>
</userTask>
<userTask id="UserTask_0y14rmq" name="sp1" activiti:assignee="wuniting">
<extensionElements>
<modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
</extensionElements>
</userTask>
<userTask id="UserTask_17jd9y1" name="sp2" activiti:assignee="zhangmiao">
<extensionElements>
<modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
</extensionElements>
</userTask>
<parallelGateway id="ParallelGateway_1qs7f87"></parallelGateway>
<endEvent id="EndEvent_0fo9mwb" name="交易完成"></endEvent>
<sequenceFlow id="SequenceFlow_1dkxqia" sourceRef="UserTask_1wba62u" targetRef="ParallelGateway_0g393ev"></sequenceFlow>
<sequenceFlow id="SequenceFlow_1pp85s1" sourceRef="ParallelGateway_0g393ev" targetRef="UserTask_1nt87by"></sequenceFlow>
<sequenceFlow id="SequenceFlow_1x051ae" sourceRef="ParallelGateway_0g393ev" targetRef="UserTask_1xty4gu"></sequenceFlow>
<sequenceFlow id="SequenceFlow_05zxco5" sourceRef="UserTask_1nt87by" targetRef="UserTask_0y14rmq"></sequenceFlow>
<sequenceFlow id="SequenceFlow_0bx5wt0" sourceRef="UserTask_1xty4gu" targetRef="UserTask_17jd9y1"></sequenceFlow>
<sequenceFlow id="SequenceFlow_0xgm2pr" sourceRef="UserTask_17jd9y1" targetRef="ParallelGateway_1qs7f87"></sequenceFlow>
<sequenceFlow id="SequenceFlow_1o2rph4" sourceRef="UserTask_0y14rmq" targetRef="ParallelGateway_1qs7f87"></sequenceFlow>
<sequenceFlow id="SequenceFlow_1hyky18" sourceRef="ParallelGateway_1qs7f87" targetRef="UserTask_0mkm9h7"></sequenceFlow>
<userTask id="UserTask_0mkm9h7" name="spe" activiti:assignee="wuniting">
<extensionElements>
<modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
</extensionElements>
</userTask>
<sequenceFlow id="SequenceFlow_1smv331" sourceRef="UserTask_0mkm9h7" targetRef="EndEvent_0fo9mwb"></sequenceFlow>
</process>
<bpmndi:BPMNDiagram id="BPMNDiagram_Process_1">
<bpmndi:BPMNPlane bpmnElement="Process_1" id="BPMNPlane_Process_1">
<bpmndi:BPMNShape bpmnElement="StartEvent_1b9bgjv" id="BPMNShape_StartEvent_1b9bgjv">
<omgdc:Bounds height="36.0" width="36.0" x="182.0" y="222.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="UserTask_1wba62u" id="BPMNShape_UserTask_1wba62u">
<omgdc:Bounds height="80.0" width="100.0" x="270.0" y="200.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="ParallelGateway_0g393ev" id="BPMNShape_ParallelGateway_0g393ev">
<omgdc:Bounds height="50.0" width="50.0" x="425.0" y="215.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="UserTask_1nt87by" id="BPMNShape_UserTask_1nt87by">
<omgdc:Bounds height="80.0" width="100.0" x="540.0" y="140.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="UserTask_1xty4gu" id="BPMNShape_UserTask_1xty4gu">
<omgdc:Bounds height="80.0" width="100.0" x="540.0" y="260.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="UserTask_0y14rmq" id="BPMNShape_UserTask_0y14rmq">
<omgdc:Bounds height="80.0" width="100.0" x="710.0" y="140.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="UserTask_17jd9y1" id="BPMNShape_UserTask_17jd9y1">
<omgdc:Bounds height="80.0" width="100.0" x="710.0" y="260.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="ParallelGateway_1qs7f87" id="BPMNShape_ParallelGateway_1qs7f87">
<omgdc:Bounds height="50.0" width="50.0" x="865.0" y="205.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="EndEvent_0fo9mwb" id="BPMNShape_EndEvent_0fo9mwb">
<omgdc:Bounds height="36.0" width="36.0" x="1162.0" y="212.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="UserTask_0mkm9h7" id="BPMNShape_UserTask_0mkm9h7">
<omgdc:Bounds height="80.0" width="100.0" x="990.0" y="190.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1pp85s1" id="BPMNEdge_SequenceFlow_1pp85s1">
<omgdi:waypoint x="450.0" y="215.0"></omgdi:waypoint>
<omgdi:waypoint x="450.0" y="180.0"></omgdi:waypoint>
<omgdi:waypoint x="540.0" y="180.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_0xgm2pr" id="BPMNEdge_SequenceFlow_0xgm2pr">
<omgdi:waypoint x="810.0" y="300.0"></omgdi:waypoint>
<omgdi:waypoint x="890.0" y="300.0"></omgdi:waypoint>
<omgdi:waypoint x="890.0" y="255.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1dkxqia" id="BPMNEdge_SequenceFlow_1dkxqia">
<omgdi:waypoint x="370.0" y="240.0"></omgdi:waypoint>
<omgdi:waypoint x="425.0" y="240.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_05zxco5" id="BPMNEdge_SequenceFlow_05zxco5">
<omgdi:waypoint x="640.0" y="180.0"></omgdi:waypoint>
<omgdi:waypoint x="710.0" y="180.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1x051ae" id="BPMNEdge_SequenceFlow_1x051ae">
<omgdi:waypoint x="450.0" y="265.0"></omgdi:waypoint>
<omgdi:waypoint x="450.0" y="300.0"></omgdi:waypoint>
<omgdi:waypoint x="540.0" y="300.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1o2rph4" id="BPMNEdge_SequenceFlow_1o2rph4">
<omgdi:waypoint x="810.0" y="180.0"></omgdi:waypoint>
<omgdi:waypoint x="890.0" y="180.0"></omgdi:waypoint>
<omgdi:waypoint x="890.0" y="205.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_0bx5wt0" id="BPMNEdge_SequenceFlow_0bx5wt0">
<omgdi:waypoint x="640.0" y="300.0"></omgdi:waypoint>
<omgdi:waypoint x="710.0" y="300.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1smv331" id="BPMNEdge_SequenceFlow_1smv331">
<omgdi:waypoint x="1090.0" y="230.0"></omgdi:waypoint>
<omgdi:waypoint x="1162.0" y="230.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1fnj22n" id="BPMNEdge_SequenceFlow_1fnj22n">
<omgdi:waypoint x="218.0" y="240.0"></omgdi:waypoint>
<omgdi:waypoint x="270.0" y="240.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="SequenceFlow_1hyky18" id="BPMNEdge_SequenceFlow_1hyky18">
<omgdi:waypoint x="915.0" y="230.0"></omgdi:waypoint>
<omgdi:waypoint x="990.0" y="230.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>