准备环境：
springMvc框架及Activity所需要的jar:
创建spring-activity.xml文件，里面内容：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"
default-lazy-init="true">
<!-- 创建一个流程引擎的配置对象 -->
<bean />
</beans>
然后在web.xml加入：
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:spring/spring-activiti.xml
</param-value>
</context-param>
启动就可以了。
如果报默报错 spring-activity.xml 改成如下：
<bean />
</bean>