扩展activiti嵌入自己的项目

activiti可以独立部署还可以嵌入项目，现在介绍怎么嵌入项目中。

步骤1：配置activiti的配置文件activiti.cfg.xml

步骤2：把activiti所依赖的jar拷到工程下面

步骤3：创建一个标准的ServletContextListener

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.apache.log4j.Logger;


public class ActivitiServletContextListener implements ServletContextListener {
	  
	  private static final Logger logger = Logger.getLogger(ActivitiServletContextListener.class);

	  @Override
	  public void contextInitialized(ServletContextEvent event) {
		  
		  ProcessEngine processEngine =ProcessEngines.getDefaultProcessEngine(); 
		  if (processEngine == null) {
		  logger.error("Could not start the Activiti Engine");
		  }
	  }

	  @Override
	  public void contextDestroyed(ServletContextEvent event) {
	    ProcessEngines.destroy();
	  }
	}

<!-- activiti -->
	<listener>
  		<listener-class>com.xxx.core.ActivitiServletContextListener</listener-class>
	</listener>

到这里就完成了，可以在项目中直接使用activiti工作引擎了。