Activiti工作流的初步学习

第一个Activiti程序

流程小结

1.创建流程图
eclipse插件、手动编写xml
推荐使用eclipse插件的方式
插件安装方式参考：http://www.cnblogs.com/strinkbug/p/4876819.html

2. 上传流程图
创建仓库（Repository）来保存流程图
流程引擎（ processEnginer）<-流程引擎的配置

3.部署流程图
RepositoryService加载流程图，然后部署流程图

4.启动流程
Class Person{
}
Person p=new Person();//创建一个实例
processInstance //流程实例
Runtime，通过运行服务（RuntimeService）得到流程实例

5.处理流程任务
任务task，通过任务服务（taskservice）去检索待处理的任务



流程引擎的配置如下：

<?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="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
<property name="jdbcUrl" value="jdbc:h2:mem:activiti"></property>
<property name="jdbcDriver" value="org.h2.Driver"></property>
<property name="jdbcUsername" value="sa"></property>
<property name="jdbcPassword" value=""></property>
<property name="databaseSchemaUpdate" value="true"></property>
</bean>

</beans>

本工程由于只是简单的学习，所以采用了H2DB

流程图（实现一个简单的HelloWorld任务）：

<?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="第一个流程图" isExecutable="true">
<startEvent id="startevent1" name="开始事件"></startEvent>
<userTask id="usertask1" name="HelloWorld"></userTask>
<endEvent id="endevent1" name="结束事件"></endEvent>
<sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
<sequenceFlow id="flow2" sourceRef="usertask1" 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="170.0" y="200.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
<omgdc:Bounds height="55.0" width="105.0" x="520.0" y="230.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
<omgdc:Bounds height="35.0" width="35.0" x="430.0" y="380.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
<omgdi:waypoint x="205.0" y="217.0"></omgdi:waypoint>
<omgdi:waypoint x="572.0" y="230.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
<omgdi:waypoint x="572.0" y="285.0"></omgdi:waypoint>
<omgdi:waypoint x="447.0" y="380.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>

具体实现的代码如下:

package com.activiti;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;

public class Helloword {
public static void main(String[] args) {
//1.获取流程引擎配置
ProcessEngineConfiguration config=ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("/config/activiti.cfg.xml");
//2.创建流程引擎
ProcessEngine engine=config.buildProcessEngine();
//3.获取RepositoryService
RepositoryService  repositoryService=engine.getRepositoryService();
//4.部署流程图
repositoryService.createDeployment().addClasspathResource("process/HelloWorld.bpmn20.xml").deploy();
//5.获取运行时服务
RuntimeService runtimeService=engine.getRuntimeService();
//6.获取流程实例
String processDefinitionKey="myProcess";
ProcessInstance instance=runtimeService.startProcessInstanceByKey(processDefinitionKey);
System.out.println(instance.getId());
//7.获取TaskService
TaskService taskService=engine.getTaskService();
//8.查询task
Task task=taskService.createTaskQuery().singleResult();
System.out.println(task.getName());

}

}

结果：