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。
1.1.1. BpmnModel使用
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。
1.1.1.1. eclipse绘制流程
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:
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<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">
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<process id="process1" isExecutable="true">
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<startEvent id="start1shareniu" name="start1shareniu"></startEvent>
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<sequenceFlow id="starttouserTask" name="starttouserTask" sourceRef="start1shareniu" targetRef="userTask1shareniu"></sequenceFlow>
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<userTask id="userTask1shareniu" name="userTask1shareniu"></userTask>
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<sequenceFlow id="userTasktoend" name="userTasktoend" sourceRef="userTask1shareniu" targetRef="endEventshareniu"></sequenceFlow>
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<endEvent id="endEventshareniu" name="endEventshareniu"></endEvent>
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</process>
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<bpmndi:BPMNDiagram id="BPMNDiagram_process1">
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<bpmndi:BPMNPlane bpmnElement="process1" id="BPMNPlane_process1">
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<bpmndi:BPMNShape bpmnElement="start1shareniu" id="BPMNShape_start1shareniu">
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<omgdc:Bounds height="35.0" width="35.0" x="70.0" y="150.0"></omgdc:Bounds>
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</bpmndi:BPMNShape>
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<bpmndi:BPMNShape bpmnElement="userTask1shareniu" id="BPMNShape_userTask1shareniu">
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<omgdc:Bounds height="60.0" width="100.0" x="180.0" y="110.0"></omgdc:Bounds>
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</bpmndi:BPMNShape>
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<bpmndi:BPMNShape bpmnElement="endEventshareniu" id="BPMNShape_endEventshareniu">
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<omgdc:Bounds height="35.0" width="35.0" x="380.0" y="76.0"></omgdc:Bounds>
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</bpmndi:BPMNShape>
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<bpmndi:BPMNEdge bpmnElement="starttouserTask" id="BPMNEdge_starttouserTask">
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<omgdi:waypoint x="87.0" y="150.0"></omgdi:waypoint>
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<omgdi:waypoint x="100.0" y="139.0"></omgdi:waypoint>
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<omgdi:waypoint x="180.0" y="140.0"></omgdi:waypoint>
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<bpmndi:BPMNLabel>
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<omgdc:Bounds height="14.0" width="100.0" x="87.0" y="150.0"></omgdc:Bounds>
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</bpmndi:BPMNLabel>
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</bpmndi:BPMNEdge>
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<bpmndi:BPMNEdge bpmnElement="userTasktoend" id="BPMNEdge_userTasktoend">
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<omgdi:waypoint x="280.0" y="140.0"></omgdi:waypoint>
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<omgdi:waypoint x="324.0" y="129.0"></omgdi:waypoint>
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<omgdi:waypoint x="324.0" y="93.0"></omgdi:waypoint>
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<omgdi:waypoint x="380.0" y="93.0"></omgdi:waypoint>
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<bpmndi:BPMNLabel>
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<omgdc:Bounds height="14.0" width="100.0" x="414.0" y="126.0"></omgdc:Bounds>
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</bpmndi:BPMNLabel>
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</bpmndi:BPMNEdge>
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</bpmndi:BPMNPlane>
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</bpmndi:BPMNDiagram>
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</definitions>
1.1.1.2. 自己生成
下面的代码,就是生成这个bpmnmodel 核心代码,代码如下所示:
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//实例化BpmnModel对象
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BpmnModel bpmnModel=new BpmnModel();
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//开始节点的属性
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StartEvent startEvent=new StartEvent();
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startEvent.setId("start1shareniu");
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startEvent.setName("start1shareniu");
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//普通的UserTask节点
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UserTask userTask=new UserTask();
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userTask.setId("userTask1shareniu");
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userTask.setName("userTask1shareniu");
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//结束节点属性
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EndEvent endEvent=new EndEvent();
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endEvent.setId("endEventshareniu");
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endEvent.setName("endEventshareniu");
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//连线信息
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List<SequenceFlow> sequenceFlows=new ArrayList<SequenceFlow>();
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List<SequenceFlow> toEnd=new ArrayList<SequenceFlow>();
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SequenceFlow s1=new SequenceFlow();
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s1.setId("starttouserTask");
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s1.setName("starttouserTask");
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s1.setSourceRef("start1shareniu");
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s1.setTargetRef("userTask1shareniu");
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sequenceFlows.add(s1);
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SequenceFlow s2=new SequenceFlow();
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s2.setId("userTasktoend");
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s2.setName("userTasktoend");
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s2.setSourceRef("userTask1shareniu");
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s2.setTargetRef("endEventshareniu");
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toEnd.add(s2);
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startEvent.setOutgoingFlows(sequenceFlows);
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userTask.setOutgoingFlows(toEnd);
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userTask.setIncomingFlows(sequenceFlows);
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endEvent.setIncomingFlows(toEnd);
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//Process对象
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Process process=new Process();
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process.setId("process1");
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process.addFlowElement(startEvent);
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process.addFlowElement(s1);
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process.addFlowElement(userTask);
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process.addFlowElement(s2);
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process.addFlowElement(endEvent);
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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。
1.1.2. BpmnModel转化xml
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:
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<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">
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<process id="process1" isExecutable="true">
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<startEvent id="start1shareniu" name="start1shareniu"></startEvent>
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<sequenceFlow id="starttouserTask" name="starttouserTask" sourceRef="start1shareniu" targetRef="userTask1shareniu"></sequenceFlow>
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<userTask id="userTask1shareniu" name="userTask1shareniu"></userTask>
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<sequenceFlow id="userTasktoend" name="userTasktoend" sourceRef="userTask1shareniu" targetRef="endEventshareniu"></sequenceFlow>
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<endEvent id="endEventshareniu" name="endEventshareniu"></endEvent>
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</process>
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<bpmndi:BPMNDiagram id="BPMNDiagram_process1">
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<bpmndi:BPMNPlane bpmnElement="process1" id="BPMNPlane_process1"></bpmndi:BPMNPlane>
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</bpmndi:BPMNDiagram>
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</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。
1.1.3. BpmnModel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。