Web项目同时使用Struts2和SpringMVC

接手公司历史遗留的一个项目，要在原有系统中添加新的功能。原有系统只使用Struts2做Web MVC，没有用Spring做解耦，数据持久层使用JDBC连接，数据库连接池是c3p0。从设计上看，原有系统抛弃了独立的服务层，把服务层和数据持久层合并，控制层（Struts2的Action）直接调用持久层对象。新增功能采用SpringMVC和Mybatis。

<!-- Struts2配置 --> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/</url-pattern> </filter-mapping> <!-- End Struts2配置 -->

从Web.xml的配置上看，Struts2把所有请求都拦截了，在struts.xml配置文件中，实际上Struts2只处理do和action结尾的请求。

<!-- 设置struts的Action请求的后缀，支持多个时以逗号隔开。 --> <constant name="struts.action.extension" value="do,action" />

修改web.xml中的配置，让Struts2过滤器只拦截do和action的路径，修改后的struts2过滤器如下

<!-- Struts2配置 --> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> <!-- End Struts2配置 -->

修改SpringMVC的处理路径，把SpringMVC的请求都改为以mvc结尾，web.xml中的配置如下

<!-- SpringMVC配置 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.mvc</url-pattern> </servlet-mapping> <!-- End SpringMVC配置 -->

经过以上配置，Struts2和SpringMVC分别处理不同的请求，实现了Struts2和SpringMVC共存。只需修改配置文件和少量代码的情况，把新功能集成到老系统中。

完整的web.xml配置如下

<!-- Spring配置 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-context.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- End Spring配置 --> <!-- 编码过滤 --> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.mvc</url-pattern> </filter-mapping> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping> <!-- End 编码过滤 --> <!-- SpringMVC配置 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.mvc</url-pattern> </servlet-mapping> <!-- End SpringMVC配置 --> <!-- Struts2配置 --> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <!-- End Struts2配置 -->