工作流中ServiceTask的各种方法

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.xmlXml代码

<?xml version="1.0" encoding="UTF-8"?>

<definitions id="definitions"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:activiti="http://activiti.org/bpmn"
targetNamespace="Examples">

<process id="serviceTaskProcess">
<startEvent id="start" />
<sequenceFlow id="flow1" sourceRef="start" targetRef="serviceTask" />

<!-- 调用委托类的依赖注入功能 -->
<serviceTask id="serviceTask" name="Java service invocation"
activiti:class="com.easyway.activiti.servicetask.ReverseStringsFieldInjected">
<extensionElements>
<activiti:field name="text1">
<activiti:expression>Welcome to Beijing</activiti:expression>
</activiti:field>
<activiti:field name="text2">
<activiti:expression>Hello Mr. Bai</activiti:expression>
</activiti:field>
</extensionElements>
</serviceTask>

<sequenceFlow id="flow2" sourceRef="serviceTask" targetRef="serviceTask1" />

<!-- 调用spring bean中的相关的委托bean -->
<serviceTask id="serviceTask1" activiti:delegateExpression="${delegateExpressionBean}" />



<sequenceFlow id="flow3" sourceRef="serviceTask1" targetRef="servicetask2" />


<!-- 调用spring bean中的方法 -->
<serviceTask id="servicetask2"
name="My Java Service Task"
activiti:expression="#{sentenceGenerator.getSentence()}" />

<sequenceFlow id="flow4" sourceRef="servicetask2" targetRef="servicetask3" />

<!-- 调用spring bean中的相关的委托bean -->
<serviceTask id="servicetask3"
name="Java service invocation"
activiti:class="com.easyway.activiti.servicetask.ToUppercase">
<extensionElements>
<activiti:field name="text" stringValue="Hello World" />
</extensionElements>
</serviceTask>

<sequenceFlow id="flow5" sourceRef="servicetask3" targetRef="endEvent" />
<endEvent id="endEvent" />
</process>

</definitions>
工作流的实现：Java代码

package com.easyway.activiti.servicetask;

import org.activiti.engine.delegate.DelegateExecution;

/**
* 从配置文件注入多个属性类型必须为Expression
* @author longgangbai
*
* 2011-12-20 下午10:08:01
*/
public class ReverseStringsFieldInjected implements JavaDelegate {

private Expression text1;
private Expression text2;

public void execute(DelegateExecution execution) {
String value1 = (String) text1.getValue(execution);
execution.setVariable("var1", new StringBuffer(value1).reverse().toString());

String value2 = (String) text2.getValue(execution);
execution.setVariable("var2", new StringBuffer(value2).reverse().toString());
}
}
Java代码

package com.easyway.activiti.servicetask;

import org.activiti.engine.delegate.DelegateExecution;

/**
* 从配置文件注入一个字符串用于变为写
* @author longgangbai
*
* 2011-12-20 下午09:56:59
*/
public class ToUppercase implements JavaDelegate {
private Expression text;
public void execute(DelegateExecution execution) throws Exception {
String value1 = (String) text.getValue(execution);
execution.setVariable("input", value1);
}

}
servicetaskSpringTest-context.xmlXml代码

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="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/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

<bean id="sentenceGenerator" class="com.easyway.activiti.servicetask.SentenceGenerator" />

<bean id="delegateExpressionBean" class="com.easyway.activiti.servicetask.DelegateExpressionBean">
<property name="sentenceGenerator" ref="sentenceGenerator" />
</bean>

<bean id="sentenceToUpperCaseBean" class="com.easyway.activiti.servicetask.SentenceToUpperCaseBean">
<property name="sentenceGenerator" ref="sentenceGenerator" />
</bean>

<bean id="myExecutionListenerBean" class="com.easyway.activiti.servicetask.ActivitiExecutionListenerBean" />
<bean id="myTaskListener" class="com.easyway.activiti.servicetask.ActivitiTaskListener" />

<bean id="myTaskListenerBean" class="com.easyway.activiti.servicetask.ActivitiTaskListenerBean" />

<bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
<property name="driverClass" value="org.h2.Driver" />
<property name="url" value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000" />
<property name="username" value="sa" />
<property name="password" value="" />
</bean>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>

<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
<property name="dataSource" ref="dataSource" />
<property name="transactionManager" ref="transactionManager" />
<property name="databaseSchemaUpdate" value="create-drop" />
<property name="jobExecutorActivate" value="false" />
</bean>

<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>

<bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
<bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
<bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
<bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
<bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />

</beans>
测试类：Java代码

package com.easyway.activiti.servicetask;

import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.test.Deployment;
import org.activiti.spring.impl.test.SpringActivitiTestCase;
import org.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。
* <serviceTask id="serviceTask" name="Java service invocation"
activiti:class="com.easyway.activiti.servicetask.ReverseStringsFieldInjected">
<extensionElements>
<activiti:field name="text1">
<activiti:expression>Welcome to Beijing</activiti:expression>
</activiti:field>
<activiti:field name="text2">
<activiti:expression>Hello Mr. Bai</activiti:expression>
</activiti:field>
</extensionElements>
</serviceTask>
2.通过spring的使用委派表达式实现
<serviceTask id="serviceTask1" activiti:delegateExpression="${delegateExpressionBean}" />
3.通过表达式将实现
<serviceTask id="servicetask2"
name="My Java Service Task"
activiti:expression="#{sentenceGenerator.getSentence()}" />

4.通过activiti:class注入相关的属性
<serviceTask id="servicetask3"
name="Java service invocation"
activiti:class="com.easyway.activiti.servicetask.ToUppercase">
<extensionElements>
<activiti:field name="text" stringValue="Hello World" />
</extensionElements>
</serviceTask>
* @author longgangbai
*
* 2011-12-20 下午09:29:23
*/
@ContextConfiguration("classpath:servicetaskSpringTest-context.xml")
public class ServiceTaskExpressionTest extends SpringActivitiTestCase {

@Deployment(resources={"diagrams/serviceTaskExpression.bpmn20.xml"})
public void testDelegateExpression() {
ProcessInstance procInst = runtimeService.startProcessInstanceByKey("serviceTaskProcess");
assertEquals(true,procInst.isEnded());
}

}
原文地址：http://topmanopensource.iteye.com/blog/1319380activiti-servicetask.rar (51.7 KB)
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