工作流中ServiceTask的各种方法-优快云博客

在工作流中的activiti的serviceTask几种方法：

模拟自动执行任务工作流的流程图：

工作流配置：

serviceTaskExpression.bpmn20.xml

    Xml代码
     
   
<?xmlversion="1.0"encoding="UTF-8"?>
<definitionsid="definitions"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:activiti="http://activiti.org/bpmn"
targetNamespace="Examples">
<processid="serviceTaskProcess">
<startEventid="start"/>
<sequenceFlowid="flow1"sourceRef="start"targetRef="serviceTask"/>
<!--调用委托类的依赖注入功能-->
<serviceTaskid="serviceTask"name="Javaserviceinvocation"
activiti:class="com.easyway.activiti.servicetask.ReverseStringsFieldInjected">
<extensionElements>
<activiti:fieldname="text1">
<activiti:expression>WelcometoBeijing</activiti:expression>
</activiti:field>
<activiti:fieldname="text2">
<activiti:expression>HelloMr.Bai</activiti:expression>
</activiti:field>
</extensionElements>
</serviceTask>
<sequenceFlowid="flow2"sourceRef="serviceTask"targetRef="serviceTask1"/>
<!--调用springbean中的相关的委托bean-->
<serviceTaskid="serviceTask1"activiti:delegateExpression="${delegateExpressionBean}"/>
<sequenceFlowid="flow3"sourceRef="serviceTask1"targetRef="servicetask2"/>
<!--调用springbean中的方法-->
<serviceTaskid="servicetask2"
name="MyJavaServiceTask"
activiti:expression="#{sentenceGenerator.getSentence()}"/>
<sequenceFlowid="flow4"sourceRef="servicetask2"targetRef="servicetask3"/>
<!--调用springbean中的相关的委托bean-->
<serviceTaskid="servicetask3"
name="Javaserviceinvocation"
activiti:class="com.easyway.activiti.servicetask.ToUppercase">
<extensionElements>
<activiti:fieldname="text"stringValue="HelloWorld"/>
</extensionElements>
</serviceTask>
<sequenceFlowid="flow5"sourceRef="servicetask3"targetRef="endEvent"/>
<endEventid="endEvent"/>
</process>
</definitions>

工作流的实现：

    Java代码
     
   
packagecom.easyway.activiti.servicetask;
importorg.activiti.engine.delegate.DelegateExecution;
/**
*从配置文件注入多个属性类型必须为Expression
*@authorlonggangbai
*
*2011-12-20下午10:08:01
*/
publicclassReverseStringsFieldInjectedimplementsJavaDelegate{
privateExpressiontext1;
privateExpressiontext2;
publicvoidexecute(DelegateExecutionexecution){
Stringvalue1=(String)text1.getValue(execution);
execution.setVariable("var1",newStringBuffer(value1).reverse().toString());
Stringvalue2=(String)text2.getValue(execution);
execution.setVariable("var2",newStringBuffer(value2).reverse().toString());
}
}

    Java代码
     
   
packagecom.easyway.activiti.servicetask;
importorg.activiti.engine.delegate.DelegateExecution;
/**
*从配置文件注入一个字符串用于变为写
*@authorlonggangbai
*
*2011-12-20下午09:56:59
*/
publicclassToUppercaseimplementsJavaDelegate{
privateExpressiontext;
publicvoidexecute(DelegateExecutionexecution)throwsException{
Stringvalue1=(String)text.getValue(execution);
execution.setVariable("input",value1);
}
}

servicetaskSpringTest-context.xml

    Xml代码
     
   
<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<beanid="sentenceGenerator"class="com.easyway.activiti.servicetask.SentenceGenerator"/>
<beanid="delegateExpressionBean"class="com.easyway.activiti.servicetask.DelegateExpressionBean">
<propertyname="sentenceGenerator"ref="sentenceGenerator"/>
</bean>
<beanid="sentenceToUpperCaseBean"class="com.easyway.activiti.servicetask.SentenceToUpperCaseBean">
<propertyname="sentenceGenerator"ref="sentenceGenerator"/>
</bean>
<beanid="myExecutionListenerBean"class="com.easyway.activiti.servicetask.ActivitiExecutionListenerBean"/>
<beanid="myTaskListener"class="com.easyway.activiti.servicetask.ActivitiTaskListener"/>
<beanid="myTaskListenerBean"class="com.easyway.activiti.servicetask.ActivitiTaskListenerBean"/>
<beanid="dataSource"class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
<propertyname="driverClass"value="org.h2.Driver"/>
<propertyname="url"value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000"/>
<propertyname="username"value="sa"/>
<propertyname="password"value=""/>
</bean>
<beanid="transactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<propertyname="dataSource"ref="dataSource"/>
</bean>
<beanid="processEngineConfiguration"class="org.activiti.spring.SpringProcessEngineConfiguration">
<propertyname="dataSource"ref="dataSource"/>
<propertyname="transactionManager"ref="transactionManager"/>
<propertyname="databaseSchemaUpdate"value="create-drop"/>
<propertyname="jobExecutorActivate"value="false"/>
</bean>
<beanid="processEngine"class="org.activiti.spring.ProcessEngineFactoryBean">
<propertyname="processEngineConfiguration"ref="processEngineConfiguration"/>
</bean>
<beanid="repositoryService"factory-bean="processEngine"factory-method="getRepositoryService"/>
<beanid="runtimeService"factory-bean="processEngine"factory-method="getRuntimeService"/>
<beanid="taskService"factory-bean="processEngine"factory-method="getTaskService"/>
<beanid="historyService"factory-bean="processEngine"factory-method="getHistoryService"/>
<beanid="managementService"factory-bean="processEngine"factory-method="getManagementService"/>
</beans>

测试类：

    Java代码
     
   
packagecom.easyway.activiti.servicetask;
importorg.activiti.engine.runtime.ProcessInstance;
importorg.activiti.engine.test.Deployment;
importorg.activiti.spring.impl.test.SpringActivitiTestCase;
importorg.springframework.test.context.ContextConfiguration;
/**
*工作流中ServiceTask的各种方法
*1.通过activiti:class使用相关的javaDelegate的子类。
*<serviceTaskid="serviceTask"name="Javaserviceinvocation"
activiti:class="com.easyway.activiti.servicetask.ReverseStringsFieldInjected">
<extensionElements>
<activiti:fieldname="text1">
<activiti:expression>WelcometoBeijing</activiti:expression>
</activiti:field>
<activiti:fieldname="text2">
<activiti:expression>HelloMr.Bai</activiti:expression>
</activiti:field>
</extensionElements>
</serviceTask>
2.通过spring的使用委派表达式实现
<serviceTaskid="serviceTask1"activiti:delegateExpression="${delegateExpressionBean}"/>
3.通过表达式将实现
<serviceTaskid="servicetask2"
name="MyJavaServiceTask"
activiti:expression="#{sentenceGenerator.getSentence()}"/>
4.通过activiti:class注入相关的属性
<serviceTaskid="servicetask3"
name="Javaserviceinvocation"
activiti:class="com.easyway.activiti.servicetask.ToUppercase">
<extensionElements>
<activiti:fieldname="text"stringValue="HelloWorld"/>
</extensionElements>
</serviceTask>
*@authorlonggangbai
*
*2011-12-20下午09:29:23
*/
@ContextConfiguration("classpath:servicetaskSpringTest-context.xml")
publicclassServiceTaskExpressionTestextendsSpringActivitiTestCase{
@Deployment(resources={"diagrams/serviceTaskExpression.bpmn20.xml"})
publicvoidtestDelegateExpression(){
ProcessInstanceprocInst=runtimeService.startProcessInstanceByKey("serviceTaskProcess");
assertEquals(true,procInst.isEnded());
}
}