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工作流引擎 -- Activiti6

第一个Activiti实例, 源码见: https://github.com/zhouweixin/activiti-demo-1

1. 下载activiti6, 地址: https://www.activiti.org/

2. 创建一个空的java项目, 名称为activiti-demo-1, 往项目添加以下文件夹

  • src -- source folder, 用来存放各种源文件
  • lib -- folder, 存放各种jar包
  • resource -- source folder, 配置文件和相应的资源文件

3. lib里需要放入三类jar包

  • activiti
  • log4j
  • mysql-connnector-java

4. resource里需要写三个文件

  • activiti.cfg.xml -- activiti默认加载的配置文件, 主要是对数据库的配置, 这里用的是mysql数据库, 所以需要提前创建act数据库
<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       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">
	
	<!-- 流程引擎配置的bean -->
	<bean id="processEngineConfiguration"
		class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/act" />
		<property name="jdbcDriver" value="com.mysql.jdbc.Driver" />
		<property name="jdbcUsername" value="root" />
		<property name="jdbcPassword" value="root" />
		<property name="databaseSchemaUpdate" value="true" />
	</bean>
</beans>
  • log4j.properties -- 日志文件默认加载的配置文件
log4j.rootLogger=INFO, stdout

# Console Appender
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern= %d{hh:mm:ss,SSS} [%t] %-5p %c %x - %m%n

# Custom tweaks
log4j.logger.com.codahale.metrics=WARN
log4j.logger.com.ryantenney=WARN
log4j.logger.com.zaxxer=WARN
log4j.logger.org.apache=WARN
log4j.logger.org.hibernate=WARN
log4j.logger.org.hibernate.engine.internal=WARN
log4j.logger.org.hibernate.validator=WARN
log4j.logger.org.springframework=WARN
log4j.logger.org.springframework.web=WARN
log4j.logger.org.springframework.security=WARN
  • MyProcess.bpmn -- 创建的一个流程, 任意创建一个流程都可运行
<?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">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="task1"></userTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
    <userTask id="usertask2" name="task2"></userTask>
    <sequenceFlow id="flow2" sourceRef="usertask1" targetRef="usertask2"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow3" sourceRef="usertask2" 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="70.0" y="120.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55.0" width="105.0" x="150.0" y="110.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2">
        <omgdc:Bounds height="55.0" width="105.0" x="300.0" y="110.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="450.0" y="120.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="105.0" y="137.0"></omgdi:waypoint>
        <omgdi:waypoint x="150.0" y="137.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="255.0" y="137.0"></omgdi:waypoint>
        <omgdi:waypoint x="300.0" y="137.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="405.0" y="137.0"></omgdi:waypoint>
        <omgdi:waypoint x="450.0" y="137.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

5. src里创建Demo1.java

public class Demo1 {

	/**
	 * 部署流程
	 */
	@Test
	public void deployProcess() {

		// 默认去加载resource下的activiti.cfg.xml配置文件，可以查看源码
		// 通过默认的方法创建流程引擎:这里主要是数据库的配置
		ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();

		// 【存储服务】
		RepositoryService repositoryService = engine.getRepositoryService();

		// 部署流程文件：文件内容和流程图存储到数据表【act_ge_bytearray】中
		repositoryService.createDeployment().addClasspathResource("MyProcess.bpmn").deploy();
	}

	/**
	 * 执行流程
	 */
	@Test
	public void doProcess() {
		// 通过默认的方法创建流程引擎:这里主要是数据库的配置
		ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
		// 【运行时服务】
		RuntimeService runService = engine.getRuntimeService();
		// 【任务服务】
		TaskService taskService = engine.getTaskService();
		
		// 启动流程
		ProcessInstance processInstance = runService.startProcessInstanceByKey("myProcess");

		// 普通员工完成请假的任务
		Task task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
		System.out.println("当前流程节点：" + task.getName());
		taskService.complete(task.getId());

		// 经理审核任务
		task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
		System.out.println("当前流程节点：" + task.getName());
		taskService.complete(task.getId());

		task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
		System.out.println("流程结束后：" + task);

		engine.close();
		System.exit(0);
	}

}

6. 执行部署流程函数deployProcess

  • 第一次执行会比较慢, 因为程序会在act数据库里创建28张activiti用到的表

7. 执行doProcess函数

  • 创建一个流程实例, 并按次序执行任务1和任务2

结束

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