Activiti5第十一弹，流程监听器与任务监听器

首先创建流程监听器和任务监听器的实体类，个人比较喜欢使用Delegate Expression方式，其他两种方式也可以

流程监听器

package org.mpc.final_activiti;import java.io.Serializable;import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.ExecutionListener;
import org.activiti.engine.delegate.Expression;/*** * 可以使用 CLASS ,EXPRESSION,DELEGATE EXPRESSSION三种方式来创建监听器，这里使用第三种方式，其他两种方式和* 在servicetask中的使用方式相同* * */
public class ExectuionListenerDemo implements Serializable, ExecutionListener {/*** @Fields serialVersionUID : TODO(用一句话描述这个变量表示什么)*/private static final long serialVersionUID = 8513750196548027535L;private Expression message;public Expression getMessage() {return message;}public void setMessage(Expression message) {this.message = message;}@Overridepublic void notify(DelegateExecution execution) throws Exception {System.out.println("流程监听器" + message.getValue(execution));}}

任务监听器

package org.mpc.final_activiti;import java.io.Serializable;import org.activiti.engine.delegate.DelegateTask;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.delegate.TaskListener;/*** * 任务监听器，实现TaskListener接口* * */
public class TaskListenerDemo implements Serializable, TaskListener {private Expression arg;public Expression getArg() {return arg;}public void setArg(Expression arg) {this.arg = arg;}@Overridepublic void notify(DelegateTask delegateTask) {System.out.println("任务监听器:" + arg.getValue(delegateTask));}}

这两个监听器只是简单的表明了自己的身份，并打印出在流程中注入给他们的值

接着是流程定义图

从左到右依次是空开始事件--排他网关--用户任务--空中间抛出事件--空结束事件

首先在空白处点击鼠标，接着在properties选项卡中做如下操作：

然后在排他网关、空中间抛出事件、以及节点之间的箭头上点击鼠标同样可以做如上的操作，这些都流程监听事件的配置

在usertask上我们特别配置usertask才有的任务监听器，配置过程如下图所示

和流程监听器的配置大同小异呢

展示一下配置结果的xml文件，特别注意一下加注释的地方

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test"><process id="myProcess" name="My process" isExecutable="true"><extensionElements><activiti:executionListener event="start" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[流程启动]]></activiti:string></activiti:field></activiti:executionListener><activiti:executionListener event="end" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[流程结束]]></activiti:string></activiti:field></activiti:executionListener></extensionElements><startEvent id="startevent1" name="Start"></startEvent><exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"><extensionElements><activiti:executionListener event="start" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[排他网关开始]]></activiti:string></activiti:field></activiti:executionListener><activiti:executionListener event="end" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[排他网关结束]]></activiti:string></activiti:field></activiti:executionListener></extensionElements></exclusiveGateway><sequenceFlow id="flow3" sourceRef="startevent1" targetRef="exclusivegateway1"></sequenceFlow><userTask id="usertask2" name="User Task" activiti:assignee="${user}"><extensionElements><activiti:taskListener event="create" delegateExpression="${mytaskListener}"><activiti:field name="arg"><activiti:string><![CDATA[任务启动]]></activiti:string></activiti:field></activiti:taskListener><activiti:taskListener event="assignment" delegateExpression="${mytaskListener}"><activiti:field name="arg"><activiti:string><![CDATA[分配人员]]></activiti:string></activiti:field></activiti:taskListener><activiti:taskListener event="complete" delegateExpression="${mytaskListener}"><activiti:field name="arg"><activiti:string><![CDATA[任务完成]]></activiti:string></activiti:field></activiti:taskListener><!-- 在可视化工具中无法给usertask加上流程监听器，但是，我们在xml中可以自己敲进去· --><activiti:executionListener event="start" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[流程启动任务]]></activiti:string></activiti:field></activiti:executionListener><activiti:executionListener event="end" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[流程关闭任务]]></activiti:string></activiti:field></activiti:executionListener><!-- ........................................................................................................................................ --></extensionElements></userTask><sequenceFlow id="flow4" sourceRef="exclusivegateway1" targetRef="usertask2"><extensionElements><activiti:executionListener event="take" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[从排他网关到用户任务，好长的一段路]]></activiti:string></activiti:field></activiti:executionListener></extensionElements></sequenceFlow><intermediateThrowEvent id="noneintermediatethrowevent1" name="NoneThrowEvent"><extensionElements><activiti:executionListener event="start" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[中间事件开始]]></activiti:string></activiti:field></activiti:executionListener><activiti:executionListener event="end" delegateExpression="${myprocessListener}"><activiti:field name="message"><activiti:string><![CDATA[中间事件结束]]></activiti:string></activiti:field></activiti:executionListener></extensionElements></intermediateThrowEvent><sequenceFlow id="flow5" sourceRef="usertask2" targetRef="noneintermediatethrowevent1"></sequenceFlow><endEvent id="endevent1" name="End"></endEvent><sequenceFlow id="flow6" sourceRef="noneintermediatethrowevent1" targetRef="endevent1"></sequenceFlow></process><bpmndi:BPMNDiagram id="BPMNDiagram_myProcess"><bpmndi:BPMNPlane bpmnElement="myProcess" id="BPMNPlane_myProcess"><bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1"><omgdc:Bounds height="35.0" width="35.0" x="160.0" y="180.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="exclusivegateway1" id="BPMNShape_exclusivegateway1"><omgdc:Bounds height="40.0" width="40.0" x="240.0" y="130.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2"><omgdc:Bounds height="55.0" width="105.0" x="325.0" y="123.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="noneintermediatethrowevent1" id="BPMNShape_noneintermediatethrowevent1"><omgdc:Bounds height="35.0" width="35.0" x="475.0" y="133.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1"><omgdc:Bounds height="35.0" width="35.0" x="555.0" y="133.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3"><omgdi:waypoint x="195.0" y="197.0"></omgdi:waypoint><omgdi:waypoint x="260.0" y="170.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4"><omgdi:waypoint x="280.0" y="150.0"></omgdi:waypoint><omgdi:waypoint x="325.0" y="150.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="flow5" id="BPMNEdge_flow5"><omgdi:waypoint x="430.0" y="150.0"></omgdi:waypoint><omgdi:waypoint x="475.0" y="150.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="flow6" id="BPMNEdge_flow6"><omgdi:waypoint x="510.0" y="150.0"></omgdi:waypoint><omgdi:waypoint x="555.0" y="150.0"></omgdi:waypoint></bpmndi:BPMNEdge></bpmndi:BPMNPlane></bpmndi:BPMNDiagram>
</definitions>

为了让usertak产生一个指定人员的事件，我们给这个usertask弄一个指定人员

然后就是测试代码

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.ExectuionListenerDemo;
import org.mpc.final_activiti.TaskListenerDemo;public class ListenersTest extends PluggableActivitiTestCase {@Test@Deployment(resources = "final_activiti/progress/listeners.bpmn")public void test() {Map<String, Object> map = new HashMap<String, Object>();map.put("myprocessListener", new ExectuionListenerDemo());map.put("mytaskListener", new TaskListenerDemo());map.put("user", "mpc");runtimeService.startProcessInstanceByKey("myProcess", map);taskService.complete(taskService.createTaskQuery().singleResult().getId());;}}

测试结果：