activiti5第四弹----serviceTask中的java服务任务

activiti.cfg.xml内容：

<?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来实现java服务任务

HelloService内容：

package org.mpc.final_activiti;import org.activiti.engine.delegate.DelegateExecution;import org.activiti.engine.delegate.JavaDelegate;/** *  * 作为activiti的ServiceTask的实现，必须实现JavaDelegate接口，但是不需要实现序列化接口 *  * activiti会使用反射机制将类初始化，因此在实现JavaDelegate接口的时候需要提供一个 * 无参数的构造器，否则会抛出异常。 *  * @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();}}

测试方法：

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());}}

测试结果：

从测试结果可以看到，我们在流程中定义的连个Service task都执行了，而且可以从红线标注处看到这两个Service是不一样的，也就是说activiti在每次需要执行一个Service task 的时候都重新创建了服务对象。

方式二：使用 Delegate expression来实现java服务任务

delegate对应的java类:

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 {/** * 实现JavaDelegate接口，使用其中的execute方法 由于要放入流程定义中，所以要实现可序列话接口 *  */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();}}

测试类:

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() {//定义delegate放入流程定义中启动流程Map<String, Object> map = new HashMap<String, Object>();map.put("delegate", new Helloservice1());runtimeService.startProcessInstanceByKey("service2", map);}}

测试结果:

结果显示两个Service task 都执行了，而且可以发现，使用的是同一个服务对象。这样更节省系统开销吧。。。

方式三：使用expression

第二个Service task 的main config内容：

myBean对应的服务类：

package org.mpc.final_activiti;import java.io.Serializable;import org.activiti.engine.runtime.Execution;/** *  * 不需要实现javadelegate，但是由于要放入到流程定义中，所以需要实现可序列话接口 *  *  */public class HelloService2 implements Serializable {private static final long serialVersionUID = 2356L;private String name = "test_mpc";/** * @Title: getName * @Description: 这里的get方法是必要的，因为在流程中直接使用对象.属性的方式调用属性的话，就相当于调用这里的get方法 * @param @return 设定文件 * @return String 返回类型 * @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 ! ");}}

测试类:

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());}}

测试结果: