集成activiti到现有项目中

1.在lib中添加相关的jar包

2.找到一个activiti.cfg.xml，若是想用现有的数据库需要配置

<?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.StandaloneInMemProcessEngineConfiguration">
		<property name="jdbcDriver" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/activiti?createDatabaseIfNotExist=true&useUnicode=true&characterEncoding=utf-8&characterSetResults=utf-8"></property>
		<property name="jdbcUsername" value="root"></property>
		<property name="jdbcPassword" value="foresight"></property>
		<property name="databaseSchemaUpdate" value="true"/>
	</bean>
</beans>

　　并且在eclipse中画出bpmn2.0流程图，要想默认能够加载到activiti.cfg.xml需要把该文件放在根目录src下，或者新建一个source folder，并将该文件放入其中，可以使用如下代码加载流程引擎：

ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
ProcessEngine processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("activiti123.cfg.xml").buildProcessEngine();

若是想把activiti.cfg.xml放到某个包下（如：org.activiti.resource），加载时需要指定路径才能访问到，不然会报找不到该文件

ProcessEngine processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("org/activiti/resource/activiti.cfg.xml").buildProcessEngine();