activiti.cfg.xml內容：

<?xml version="1.0"?> <beans default-lazy-init="false"xsi:schemaLocation=" http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jee="http://www.springframework.org/schema/jee"xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context"xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://www.springframework.org/schema/beans"><beanclass="org.activiti.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration"id="processEngineConfiguration"><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/activi1" /><property name="jdbcDriver" value="com.mysql.jdbc.Driver" /><property name="jdbcUsername" value="root" /><property name="jdbcPassword" value="root" /><property name="databaseSchemaUpdate" value="true" /><property name="jobExecutorActivate" value="true" /><property name="mailServerHost" value="mail.my-corp.com" /><property name="mailServerPort" value="5025" /><property name="history" value="full"></property></bean> </beans>

方式一：使用java class來實現java服務任務

HelloService內容：

package org.mpc.final_activiti;import org.activiti.engine.delegate.DelegateExecution; import org.activiti.engine.delegate.JavaDelegate;/*** * 作為activiti的ServiceTask的實現，必須實現JavaDelegate接口，但是不需要實現序列化接口* * activiti會使用反射機制將類初始化，因此在實現JavaDelegate接口的時候需要提供一個* 無參數的構造器，否則會拋出異常。* * @author mpc**/ public class HelloService implements JavaDelegate {@Overridepublic void execute(DelegateExecution arg0) throws Exception {System.out.println("---------------------------------------------");System.out.println();System.out.println("Hello Service " + this.toString()+ "Is Saying Hello To Every One !");System.out.println("---------------------------------------------");System.out.println();}}
測試方法：

package final_activiti.progress;import org.activiti.engine.impl.test.PluggableActivitiTestCase; import org.activiti.engine.test.Deployment; import org.junit.Test;public class ServiceTask1Test extends PluggableActivitiTestCase {@Test@Deployment(resources = "final_activiti/progress/serviceTask_01.bpmn")public void test() {assertProcessEnded(runtimeService.startProcessInstanceByKey("service1").getId());}}
測試結果：

從測試結果可以看到，我們在流程中定義的連個Service task都執行了，而且可以從紅線標注處看到這兩個Service是不一樣的，也就是說activiti在每次需要執行一個Service task 的時候都重新創建了服務對象。

方式二：使用 Delegate expression來實現java服務任務

delegate對應的java類:

package org.mpc.final_activiti;import java.io.Serializable;import org.activiti.engine.delegate.DelegateExecution; import org.activiti.engine.delegate.JavaDelegate;public class Helloservice1 implements Serializable, JavaDelegate {/*** 實現JavaDelegate接口，使用其中的execute方法 由于要放入流程定義中，所以要實現可序列話接口* */private static final long serialVersionUID = 5593437463482732772L;@Overridepublic void execute(DelegateExecution arg0) throws Exception {System.out.println("---------------------------------------------");System.out.println();System.out.println("Hello Service " + this.toString()+ "Is Saying Hello To Every One !");System.out.println("---------------------------------------------");System.out.println();}}

測試類:

package final_activiti.progress;import java.util.HashMap; import java.util.Map;import org.activiti.engine.impl.test.PluggableActivitiTestCase; import org.activiti.engine.test.Deployment; import org.junit.Test; import org.mpc.final_activiti.Helloservice1;public class ServiceTask2Test extends PluggableActivitiTestCase {@Test@Deployment(resources = "final_activiti/progress/serviceTask_02.bpmn")public void test() {//定義delegate放入流程定義中啟動流程Map<String, Object> map = new HashMap<String, Object>();map.put("delegate", new Helloservice1());runtimeService.startProcessInstanceByKey("service2", map);}}
測試結果:

結果顯示兩個Service task 都執行了，而且可以發現，使用的是同一個服務對象。這樣更節省系統開銷吧。。。

方式三：使用expression

第二個Service task 的main config內容：

myBean對應的服務類：

package org.mpc.final_activiti;import java.io.Serializable;import org.activiti.engine.runtime.Execution;/*** * 不需要實現javadelegate，但是由于要放入到流程定義中，所以需要實現可序列話接口* * */ public class HelloService2 implements Serializable {private static final long serialVersionUID = 2356L;private String name = "test_mpc";/*** @Title: getName* @Description: 這里的get方法是必要的，因為在流程中直接使用對象.屬性的方式調用屬性的話，就相當于調用這里的get方法* @param @return 設定文件* @return String 返回類型* @throws* @author mpc*/public String getName() {return name;}public void print(Execution ex) {System.out.println("This is HellService2 Called by process "+ ex.getId() + "who's saying hello ! ");} }
測試類:

package final_activiti.progress;import java.util.HashMap; import java.util.Map;import org.activiti.engine.impl.test.PluggableActivitiTestCase; import org.activiti.engine.runtime.ProcessInstance; import org.activiti.engine.test.Deployment; import org.junit.Test; import org.mpc.final_activiti.HelloService2;public class ServiceTask3Test extends PluggableActivitiTestCase {@Test@Deployment(resources = "final_activiti/progress/serviceTask_03.bpmn")public void test() {Map<String, Object> map = new HashMap<String, Object>();map.put("myBean", new HelloService2());ProcessInstance pi = runtimeService.startProcessInstanceByKey("service3", map);String s = (String) runtimeService.getVariable(pi.getId(), "myVar");assertTrue("test_mpc".equals(s));taskService.complete(taskService.createTaskQuery().singleResult().getId());assertProcessEnded(pi.getId());}}
測試結果:

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