Activiti的简单入门例子（经典的请假例子）

经典的请假例子：

流程如下，首先需要部门经理审批，如果请假天数大于2天，则需要总经理审批，否则HR审批即可

一：创建maven项目，项目结构如下：

加入依赖

pom.xml

<dependency><groupId>org.activiti</groupId><artifactId>activiti-engine</artifactId><version>5.17.0</version></dependency><dependency><groupId>org.activiti</groupId><artifactId>activiti-bpmn-layout</artifactId><version>5.17.0</version></dependency><dependency><groupId>org.postgresql</groupId><artifactId>postgresql</artifactId><version>9.3-1103-jdbc41</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.12</version></dependency>

activiti.cfg.xml 

数据库使用postgresql

<?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">     <bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">        <property name="databaseSchemaUpdate" value="drop-create"/>        <property name="jdbcUrl" value="jdbc:postgresql://127.0.0.1/db_cloud"/>        <property name="jdbcDriver" value="org.postgresql.Driver"/>        <property name="jdbcUsername" value="admin"/>        <property name="jdbcPassword" value="root"/>        <property name="jobExecutorActivate" value="true"/>    </bean></beans>

流程文件leave.bpmn20.xml

<?xml version="1.0" encoding="UTF-8"?><definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"xmlns:activiti="http://activiti.org/bpmn" targetNamespace="Examples"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL             http://www.omg.org/spec/BPMN/2.0/20100501/BPMN20.xsd"><process id="leave_process" name="某公司请假流程"><startEvent id="leave" name="请假申请"></startEvent><userTask id="dept_manager" name="部门经理审批"></userTask><userTask id="boss" name="总经理审批"></userTask><userTask id="hr" name="HR审批"></userTask><sequenceFlow id="flow1" sourceRef="leave" targetRef="dept_manager"></sequenceFlow><sequenceFlow id="flow2" sourceRef="dept_manager" targetRef="boss"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${day >= 3}]]></conditionExpression></sequenceFlow><sequenceFlow id="flow3" sourceRef="boss" targetRef="hr"></sequenceFlow><sequenceFlow id="flow4" sourceRef="dept_manager" targetRef="hr"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${day < 3}]]></conditionExpression></sequenceFlow><sequenceFlow id="flow5" sourceRef="hr" targetRef="end"></sequenceFlow><endEvent id="end" name="结束"></endEvent></process></definitions>

流程图如下：

二：代码演示

Leave.java

package com.lala.activiti;import java.util.HashMap;import java.util.List;import java.util.Map;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.task.Task;import org.activiti.engine.task.TaskQuery;public class Leave{static void log(Object obj)    {    System.out.println(obj);    }static void run(ProcessEngine processEngine) throws Exception{RepositoryService repositoryService = processEngine.getRepositoryService();        repositoryService.createDeployment().addClasspathResource("leave.bpmn20.xml").deploy();                RuntimeService runtimeService = processEngine.getRuntimeService();                Map<String, Object> variables = new HashMap<>();        variables.put("userid", "10010");        variables.put("day", 3);                runtimeService.startProcessInstanceByKey("leave_process", variables);                TaskService taskService = processEngine.getTaskService();                TaskQuery query = taskService.createTaskQuery();                List<Task> tasks = query.list();        for(Task task : tasks)        {        log(task.getId() + "," + task.getName());        taskService.complete(task.getId(), variables);        }                log("--------------------");                tasks = query.list();        for(Task task : tasks)        {        log(task.getId() + "," + task.getName());        taskService.complete(task.getId(), variables);        }                log("--------------------");                tasks = query.list();        for(Task task : tasks)        {        log(task.getId() + "," + task.getName());        taskService.complete(task.getId(), variables);        }}public static void main(String[] args){ProcessEngine processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("activiti.cfg.xml").buildProcessEngine();try {run(processEngine);} catch (Exception e) {e.printStackTrace();}processEngine.close();}}

当

variables.put("day", 3);

大于等于3的时候，输出

9,部门经理审批
--------------------
11,总经理审批
--------------------
13,HR审批

否则，输出

9,部门经理审批
--------------------
11,HR审批