1.创建bpmn文件（生成bpmn文件步骤见helloworld）
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" 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" xmlns:tns="http://www.activiti.org/test" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" expressionLanguage="http://www.w3.org/1999/XPath" id="m1558514107482" name="" targetNamespace="http://www.activiti.org/test" typeLanguage="http://www.w3.org/2001/XMLSchema">
<process id="myProcess" isClosed="false" isExecutable="true" processType="None">
<startEvent id="_2" name="StartEvent"/>
<userTask activiti:assignee="张3" activiti:exclusive="true" id="_3" name="Task1"/>
<userTask activiti:assignee="李4" activiti:exclusive="true" id="_4" name="Task2-1"/>
<userTask activiti:assignee="王5" activiti:exclusive="true" id="_5" name="Task2-2"/>
<userTask activiti:assignee="赵6" activiti:exclusive="true" id="_6" name="Task3"/>
<endEvent id="_7" name="EndEvent"/>
<sequenceFlow id="_8" sourceRef="_2" targetRef="_3"/>
<sequenceFlow id="_9" sourceRef="_3" targetRef="_4">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${message=='重要'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="_10" sourceRef="_3" targetRef="_5">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${message=='不重要'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="_11" sourceRef="_4" targetRef="_6">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${condition=='1'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="_12" sourceRef="_5" targetRef="_6">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${condition=='0'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="_13" sourceRef="_6" targetRef="_7"/>
</process>
<bpmndi:BPMNDiagram documentation="background=#3C3F41;count=1;horizontalcount=1;orientation=0;width=842.4;height=1195.2;imageableWidth=832.4;imageableHeight=1185.2;imageableX=5.0;imageableY=5.0" id="Diagram-_1" name="New Diagram">
<bpmndi:BPMNPlane bpmnElement="myProcess_1">
<bpmndi:BPMNShape bpmnElement="_2" id="Shape-_2">
<omgdc:Bounds height="32.0" width="32.0" x="530.0" y="-5.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="32.0" width="32.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_3" id="Shape-_3">
<omgdc:Bounds height="55.0" width="85.0" x="490.0" y="80.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="55.0" width="85.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_4" id="Shape-_4">
<omgdc:Bounds height="55.0" width="85.0" x="445.0" y="280.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="55.0" width="85.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_5" id="Shape-_5">
<omgdc:Bounds height="55.0" width="85.0" x="570.0" y="275.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="55.0" width="85.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_6" id="Shape-_6">
<omgdc:Bounds height="55.0" width="85.0" x="510.0" y="485.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="55.0" width="85.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_7" id="Shape-_7">
<omgdc:Bounds height="32.0" width="32.0" x="550.0" y="665.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="32.0" width="32.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge bpmnElement="_13" id="BPMNEdge__13" sourceElement="_6" targetElement="_7">
<omgdi:waypoint x="566.0" y="540.0"/>
<omgdi:waypoint x="566.0" y="665.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="0.0" width="0.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="_12" id="BPMNEdge__12" sourceElement="_5" targetElement="_6">
<omgdi:waypoint x="582.5" y="330.0"/>
<omgdi:waypoint x="582.5" y="485.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="0.0" width="0.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="_8" id="BPMNEdge__8" sourceElement="_2" targetElement="_3">
<omgdi:waypoint x="546.0" y="27.0"/>
<omgdi:waypoint x="546.0" y="80.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="0.0" width="0.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="_9" id="BPMNEdge__9" sourceElement="_3" targetElement="_4">
<omgdi:waypoint x="510.0" y="135.0"/>
<omgdi:waypoint x="510.0" y="280.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="0.0" width="0.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="_11" id="BPMNEdge__11" sourceElement="_4" targetElement="_6">
<omgdi:waypoint x="520.0" y="335.0"/>
<omgdi:waypoint x="520.0" y="485.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="0.0" width="0.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="_10" id="BPMNEdge__10" sourceElement="_3" targetElement="_5">
<omgdi:waypoint x="572.5" y="135.0"/>
<omgdi:waypoint x="572.5" y="275.0"/>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="0.0" width="0.0" x="0.0" y="0.0"/>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>
2.在完成任务是设置流程变量 决定下一步走哪一条连线
@Test
public void test2(){
ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
processEngine.getRuntimeService().startProcessInstanceByKey("myProcess");
}
@Test
public void test3(){
ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
HashMap<String, Object> map = new HashMap<>();
map.put("message","重要");
processEngine.getTaskService().complete("15004",map);
}
测试成功
3.总结
1、一个活动中可以指定一个或多个SequenceFlow（Start中有一个，End中没有）。
* 开始活动中有一个SequenceFlow 。
* 结束活动中没有SequenceFlow 。
* 其他活动中有1条或多条SequenceFlow
2、如果只有一个，则可以不使用流程变量设置codition的名称；
如果有多个，则需要使用流程变量设置codition的名称。message表示流程变量的名称，‘不重要’表示流程变量的值，${}中间的内容要使用boolean类型的表达式，用来判断应该执行的连线。
