bpmnModel对象,是activiti动态部署钟很重要的一个对象,如果bpmnModel对象不能深入的理解,那可能如果自己需要开发一套流程设计器,就显得力不从心,之前我们公司自己开发了一套activiti web设计器,如下图所示:
当activiti web设计器设计的时候,存储格式是自定义的json对象,那现在问题来了,我们怎么把我们自己的json格式转化为标准的bpmn需要的xml文件呢?这一点很重要?所以这也是本节课需要重点讲解的地方,大家实际开发可以举一反三。灵活的运用到项目中。
因为平时我们在使用的时候,展示流程图没有使用是默认的流程生成的这种方式,所以这里坐标信息,暂时不演示,主要演示节点等的核心功能。
为了方便演示,这里我们先在eclipse中绘制一个简单的流程。具体的流程图如下:
流程图的xml文件如下:直接用文本打开bpmn文件即可:
<?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://www.activiti.org/test"> <process id="process1" isExecutable="true"> <startEvent id="start1shareniu" name="start1shareniu"></startEvent> <sequenceFlow id="starttouserTask" name="starttouserTask" sourceRef="start1shareniu" targetRef="userTask1shareniu"></sequenceFlow> <userTask id="userTask1shareniu" name="userTask1shareniu"></userTask> <sequenceFlow id="userTasktoend" name="userTasktoend" sourceRef="userTask1shareniu" targetRef="endEventshareniu"></sequenceFlow> <endEvent id="endEventshareniu" name="endEventshareniu"></endEvent> </process> <bpmndi:BPMNDiagram id="BPMNDiagram_process1"> <bpmndi:BPMNPlane bpmnElement="process1" id="BPMNPlane_process1"> <bpmndi:BPMNShape bpmnElement="start1shareniu" id="BPMNShape_start1shareniu"> <omgdc:Bounds height="35.0" width="35.0" x="70.0" y="150.0"></omgdc:Bounds> </bpmndi:BPMNShape> <bpmndi:BPMNShape bpmnElement="userTask1shareniu" id="BPMNShape_userTask1shareniu"> <omgdc:Bounds height="60.0" width="100.0" x="180.0" y="110.0"></omgdc:Bounds> </bpmndi:BPMNShape> <bpmndi:BPMNShape bpmnElement="endEventshareniu" id="BPMNShape_endEventshareniu"> <omgdc:Bounds height="35.0" width="35.0" x="380.0" y="76.0"></omgdc:Bounds> </bpmndi:BPMNShape> <bpmndi:BPMNEdge bpmnElement="starttouserTask" id="BPMNEdge_starttouserTask"> <omgdi:waypoint x="87.0" y="150.0"></omgdi:waypoint> <omgdi:waypoint x="100.0" y="139.0"></omgdi:waypoint> <omgdi:waypoint x="180.0" y="140.0"></omgdi:waypoint> <bpmndi:BPMNLabel> <omgdc:Bounds height="14.0" width="100.0" x="87.0" y="150.0"></omgdc:Bounds> </bpmndi:BPMNLabel> </bpmndi:BPMNEdge> <bpmndi:BPMNEdge bpmnElement="userTasktoend" id="BPMNEdge_userTasktoend"> <omgdi:waypoint x="280.0" y="140.0"></omgdi:waypoint> <omgdi:waypoint x="324.0" y="129.0"></omgdi:waypoint> <omgdi:waypoint x="324.0" y="93.0"></omgdi:waypoint> <omgdi:waypoint x="380.0" y="93.0"></omgdi:waypoint> <bpmndi:BPMNLabel> <omgdc:Bounds height="14.0" width="100.0" x="414.0" y="126.0"></omgdc:Bounds> </bpmndi:BPMNLabel> </bpmndi:BPMNEdge> </bpmndi:BPMNPlane> </bpmndi:BPMNDiagram> </definitions>
下面的代码,就是生成这个bpmnmodel 核心代码,代码如下所示:
//实例化BpmnModel对象 BpmnModel bpmnModel=new BpmnModel(); //开始节点的属性 StartEvent startEvent=new StartEvent(); startEvent.setId("start1shareniu"); startEvent.setName("start1shareniu"); //普通的UserTask节点 UserTask userTask=new UserTask(); userTask.setId("userTask1shareniu"); userTask.setName("userTask1shareniu"); //结束节点属性 EndEvent endEvent=new EndEvent(); endEvent.setId("endEventshareniu"); endEvent.setName("endEventshareniu"); //连线信息 List<SequenceFlow> sequenceFlows=new ArrayList<SequenceFlow>(); List<SequenceFlow> toEnd=new ArrayList<SequenceFlow>(); SequenceFlow s1=new SequenceFlow(); s1.setId("starttouserTask"); s1.setName("starttouserTask"); s1.setSourceRef("start1shareniu"); s1.setTargetRef("userTask1shareniu"); sequenceFlows.add(s1); SequenceFlow s2=new SequenceFlow(); s2.setId("userTasktoend"); s2.setName("userTasktoend"); s2.setSourceRef("userTask1shareniu"); s2.setTargetRef("endEventshareniu"); toEnd.add(s2); startEvent.setOutgoingFlows(sequenceFlows); userTask.setOutgoingFlows(toEnd); userTask.setIncomingFlows(sequenceFlows); endEvent.setIncomingFlows(toEnd); //Process对象 Process process=new Process(); process.setId("process1"); process.addFlowElement(startEvent); process.addFlowElement(s1); process.addFlowElement(userTask); process.addFlowElement(s2); process.addFlowElement(endEvent); bpmnModel.addProcess(process);
上面的代码,我们已经写好了bpmnmodel绘制的流程,那我们怎么知道对还是不对呢?下面就开始将我们的bpmnmodel对象转化为标准的xml文件看一下。
将上面的对象转化为标准的xml代码如下所示:
//bpmnModel 转换为标准的bpmn xml文件
BpmnXMLConverter bpmnXMLConverter=new BpmnXMLConverter();
byte[] convertToXML = bpmnXMLConverter.convertToXML(bpmnModel);
String bytes=new String(convertToXML);
System.out.println(bytes);
运行程序,看一下程序的输出如下:
<?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://www.activiti.org/test"> <process id="process1" isExecutable="true"> <startEvent id="start1shareniu" name="start1shareniu"></startEvent> <sequenceFlow id="starttouserTask" name="starttouserTask" sourceRef="start1shareniu" targetRef="userTask1shareniu"></sequenceFlow> <userTask id="userTask1shareniu" name="userTask1shareniu"></userTask> <sequenceFlow id="userTasktoend" name="userTasktoend" sourceRef="userTask1shareniu" targetRef="endEventshareniu"></sequenceFlow> <endEvent id="endEventshareniu" name="endEventshareniu"></endEvent> </process> <bpmndi:BPMNDiagram id="BPMNDiagram_process1"> <bpmndi:BPMNPlane bpmnElement="process1" id="BPMNPlane_process1"></bpmndi:BPMNPlane> </bpmndi:BPMNDiagram> </definitions>
我们看到转化的xml文件,对比eclipse绘制流程的xml,除了坐标没有,其他的都是正确的。那我们怎么验证我们生成的xml是正确的呢?因为转化成功,也不一定可以使用的。接下来看一下bpmnmodel如何验证。
验证的方法代码如下所示:
//验证bpmnModel 是否是正确的bpmn xml文件
ProcessValidatorFactory processValidatorFactory=new ProcessValidatorFactory();
ProcessValidator defaultProcessValidator = processValidatorFactory.createDefaultProcessValidator();
//验证失败信息的封装ValidationError
List<ValidationError> validate = defaultProcessValidator.validate(bpmnModel);
System.out.println(validate.size());
需要说明的是:ValidationError封装的是验证信息,如果size为0说明,bpmnmodel正确,大于0,说明自定义的bpmnmodel是错误的,不可以使用的。
验证还是很有必要使用的,因为流程部署的时候,我们最好验证一次,没有问题在部署。
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