Spring + Activiti + Drools整合的请假例子

傷城~ 2022-08-04 08:43 260阅读 0赞

业务规则是这样的（没有实际意义，只是做demo演示）  
  
  
如果请假总天数大于等于3天，则需要总经理审批，否则不需要总经理审批  
  
  
如果当次请假小于3天，则请假总天数等于当次请假天数+2  
否则，请假总天数等于当次请假次数+5

其中，总的请假次数的计算逻辑交给drools处理

新建maven项目，目录结构如下：

![Center][]

一：加入maven依赖：

<properties>
    	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    	<activiti.version>5.17.0</activiti.version>
    	<drools.version>5.6.0.Final</drools.version>
    </properties>
    
    <dependencies>
    	<dependency>
    		<groupId>org.drools</groupId>
    		<artifactId>drools-core</artifactId>
    		<version>${drools.version}</version>
    	</dependency>
    	<dependency>
    		<groupId>org.drools</groupId>
    		<artifactId>drools-compiler</artifactId>
    		<version>${drools.version}</version>
    	</dependency>
    	<dependency>
    		<groupId>org.activiti</groupId>
    		<artifactId>activiti-engine</artifactId>
    		<version>${activiti.version}</version>
    		<scope>provided</scope>
    	</dependency>
    	<dependency>
    		<groupId>org.activiti</groupId>
    		<artifactId>activiti-bpmn-layout</artifactId>
    		<version>${activiti.version}</version>
    		<scope>provided</scope>
    	</dependency>
    	<dependency>
    		<groupId>org.activiti</groupId>
    		<artifactId>activiti-spring</artifactId>
    		<version>${activiti.version}</version>
    		<scope>provided</scope>
    	</dependency>
    	<dependency>
    		<groupId>org.postgresql</groupId>
    		<artifactId>postgresql</artifactId>
    		<version>9.4-1201-jdbc41</version>
    	</dependency>
    </dependencies>

drools貌似不能用6.x版本的

spring配置文件：

<?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="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
    		<property name="driverClass" value="org.postgresql.Driver" />
    		<property name="url" value="jdbc:postgresql://127.0.0.1/activiti17" />
    		<property name="username" value="admin" />
    		<property name="password" value="root" />
    	</bean>
    
    	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    		<property name="dataSource" ref="dataSource" />
    	</bean>
    
    	<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
    		<property name="dataSource" ref="dataSource" />
    		<property name="transactionManager" ref="transactionManager" />
    		<property name="databaseSchemaUpdate" value="true" />
    		<property name="customPostDeployers">
    			<list> 
    	              <bean class="org.activiti.engine.impl.rules.RulesDeployer" />
    	        </list> 
    		</property>
    		
    	</bean>
    
    	<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
    		<property name="processEngineConfiguration" ref="processEngineConfiguration" />
    	</bean>
    
    	<bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
    	<bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
    	<bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
    	<bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
    	<bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />
    
    </beans>

ppleave.bpmn

<?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="leave" name="请假审批" isExecutable="true">
    		<startEvent id="startevent1" name="Start"></startEvent>
    		<endEvent id="endevent1" name="End"></endEvent>
    		<userTask id="usertask1" name="部门经理审批"></userTask>
    		<businessRuleTask id="businessruletask1" name="天数判断" activiti:ruleVariablesInput="${leave}" activiti:rules="leave1,leave2" activiti:resultVariable="reason"></businessRuleTask>
    		<serviceTask id="servicetask1" name="获取变量" activiti:class="com.lala.service.DroolsService"></serviceTask>
    		<userTask id="usertask2" name="HR审批"></userTask>
    		<sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
    		<sequenceFlow id="flow2" sourceRef="usertask1" targetRef="businessruletask1"></sequenceFlow>
    		<sequenceFlow id="flow3" sourceRef="businessruletask1" targetRef="servicetask1"></sequenceFlow>
    		<userTask id="usertask3" name="总经理审批"></userTask>
    		<sequenceFlow id="flow4" sourceRef="servicetask1" targetRef="usertask3">
    			<conditionExpression xsi:type="tFormalExpression"><![CDATA[${reason[0].total >= 10}]]></conditionExpression>
    		</sequenceFlow>
    		<sequenceFlow id="flow5" sourceRef="servicetask1" targetRef="usertask2">
    			<conditionExpression xsi:type="tFormalExpression"><![CDATA[${reason[0].total < 10}]]></conditionExpression>
    		</sequenceFlow>
    		<sequenceFlow id="flow6" sourceRef="usertask3" targetRef="usertask2"></sequenceFlow>
    		<sequenceFlow id="flow7" sourceRef="usertask2" targetRef="endevent1"></sequenceFlow>
    	</process>
    </definitions>

流程图如下：

![Center 1][]

drools规则文件：product.drl

package com.product;
    import com.lala.bean.Leave;
    
    rule "leave1"
        when
        	u : Leave(day < 3);
        then
        	u.setTotal(u.getDay() + 2);
    end
    
    rule "leave2"
        when
        	u : Leave(day >= 3);
        then
        	u.setTotal(u.getDay() + 5);
    end

Fact对象：

package com.lala.bean;
    
    import java.io.Serializable;
    
    public class Leave implements Serializable
    {
    	private static final long serialVersionUID = 1L;
    	private String name;
    	private Integer day; 			//当前请假天数
    	private Integer total = 0;		//总共请假天数
    	public Leave(String name, Integer day)
    	{
    		this.name = name;
    		this.day = day;
    	}
    	public Integer getDay() 
    	{
    		return day;
    	}
    	public void setDay(Integer day)
    	{
    		this.day = day;
    	}	
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public Integer getTotal() {
    		return total;
    	}
    	public void setTotal(Integer total) {
    		this.total = total;
    	}
    	public String toString()
    	{
    		return "[name="+name+",day="+day+",total="+total+"]";
    	}
    }

package com.lala.service;
    
    import org.activiti.engine.delegate.DelegateExecution;
    import org.activiti.engine.delegate.JavaDelegate;
    
    public class DroolsService implements JavaDelegate
    {
    	public void execute(DelegateExecution execution) throws Exception
    	{	
    		System.out.println("++++++++++++++++++++++++++++++++++++++");
    		System.out.println(execution.getVariable("reason"));
    		System.out.println("++++++++++++++++++++++++++++++++++++++");
    	}
    }

测试：

package com.lala.spring;
    
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import org.activiti.engine.RepositoryService;
    import org.activiti.engine.RuntimeService;
    import org.activiti.engine.TaskService;
    import org.activiti.engine.repository.DeploymentBuilder;
    import org.activiti.engine.runtime.ProcessInstance;
    import org.activiti.engine.task.Task;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import com.lala.bean.Leave;
    
    public class Main 
    {
    	static void run(ApplicationContext context) throws Exception
    	{
        	RepositoryService repositoryService = (RepositoryService)context.getBean("repositoryService");
        	
        	/**
        	 * 注意这里：必须要把drl文件一起deploy
        	 */
        	DeploymentBuilder deploy = repositoryService.createDeployment();
        	deploy.addClasspathResource("rule/product.drl");
        	deploy.addClasspathResource("bpmn/ppleave.bpmn");
        	deploy.deploy();
        	
        	RuntimeService runtimeService = (RuntimeService)context.getBean("runtimeService");
        	
        	ProcessInstance pi = runtimeService.startProcessInstanceByKey("leave");
        	
        	TaskService taskService = (TaskService)context.getBean("taskService");
        	
        	Map<String, Object> vars = new HashMap<String, Object>();  
            vars.put("leave", new Leave("白展堂", 12));
        	
            /**
             * 当前任务
             */
        	List<Task> tasks = taskService.createTaskQuery().processInstanceId(pi.getId()).list();
        	for(Task task : tasks)
        	{
        		System.out.println(task.getId() + " , " + task.getName());
        		taskService.complete(task.getId(), vars);
        	}
        	
        	/**
        	 * 下一步任务
        	 */
        	tasks = taskService.createTaskQuery().processInstanceId(pi.getId()).list();
        	for(Task task : tasks)
        	{
        		System.out.println(task.getId() + " , " + task.getName());
        	}
    	}
        public static void main( String[] args )throws Exception
        {
        	ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        	run(context);
        	context.close();
        }
    }

运行结果：

请假天数小于3天时，输出结果：

5009 , 部门经理审批  
\++++++++++++++++++++++++++++++++++++++  
\[\[name=白展堂,day=2,total=4\]\]  
\++++++++++++++++++++++++++++++++++++++  
5019 , HR审批

否则，输出结果：

7509 , 部门经理审批  
\++++++++++++++++++++++++++++++++++++++  
\[\[name=白展堂,day=22,total=27\]\]  
\++++++++++++++++++++++++++++++++++++++  
7519 , 总经理审批

[Center]: /images/20220731/4c5b72b8372449c8ba50eaa23d110027.png
[Center 1]: /images/20220731/e0a880b93d6241e39705d764dc7a7575.png