Spring + Activiti + Drools整合的请假例子

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：

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><!-- <property name="deploymentResources" value="classpath*:/bpmn/*.bpmn" />  
		 --></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：

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