在工作流中的activiti的serviceTask幾種方法：

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模擬自動執行任務工作流的流程圖：

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工作流配置：

serviceTaskExpression.bpmn20.xml

Xml代碼??

<?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"?/>??

?????

???<!--?調用委托類的依賴注入功能?-->??

????<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"?/>??

??????

????<!--?調用spring?bean中的相關的委托bean?-->??

????<serviceTask?id="serviceTask1"?activiti:delegateExpression="${delegateExpressionBean}"?/>??

??????

??????

??????

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

???????

???????

?????<!--?調用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"?/>??

??????

??<!--?調用spring?bean中的相關的委托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>??

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工作流的實現：

Java代碼??

package?com.easyway.activiti.servicetask;??

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import?org.activiti.engine.delegate.DelegateExecution;??

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/**?

?*?從配置文件注入多個屬性類型必須為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());???

??????}???

????}??

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Java代碼??

package?com.easyway.activiti.servicetask;??

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import?org.activiti.engine.delegate.DelegateExecution;??

??

/**?

?*??從配置文件注入一個字符串用于變為寫?

?*?@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);???

??????}???

?????????

????}??

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servicetaskSpringTest-context.xml

Xml代碼??

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

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<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"?/>??

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</beans>??

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測試類：

Java代碼??

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的各種方法?

?*?1.通過activiti:class使用相關的javaDelegate的子類。?

?*????<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.通過spring的使用委派表達式實現?

??????<serviceTask?id="serviceTask1"?activiti:delegateExpression="${delegateExpressionBean}"?/>?

????3.通過表達式將實現?

????????<serviceTask?id="servicetask2"???

?????????????name="My?Java?Service?Task"???

?????????????activiti:expression="#{sentenceGenerator.getSentence()}"?/>?

?????

????4.通過activiti:class注入相關的屬性?

????????<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());??

??}??

??

}??

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? 原文地址：http://topmanopensource.iteye.com/blog/1319380

• activiti-servicetask.rar?(51.7 KB)
• 下載次數: 180

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