web.xml文件中可以配置哪些内容?

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web.xml用于配置Web应用的相关信息,如:监听器(listener)、过滤器(filter)、 Servlet、相关参数、会话超时时间、安全验证方式、错误页面等,下面是一些开发中常见的配置:

①配置spring上下文加载监听器加载Spring配置文件并创建IoC容器:

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationContext.xml</param-value>

</context-param>

 

<listener>

<listener-class>

org.springframework.web.context.ContextLoaderListener

</listener-class>

</listener>

②配置Spring的OpenSessionInView过滤器来解决延迟加载和hibernate会话关闭的矛盾:

<filter>

<filter-name>openSessionInView</filter-name>

<filter-class>

org.springframework.orm.hibernate3.support.OpenSessionInViewFilter

</filter-class>

</filter>

 

<filter-mapping>

<filter-name>openSessionInView</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

③配置会话超时时间为10分钟:

<session-config>

<session-timeout>10</session-timeout>

</session-config>

④配置404和Exception的错误页面:

<error-page>

<error-code>404</error-code>

<location>/error.jsp</location>

</error-page>

 

<error-page>

<exception-type>java.lang.Exception</exception-type>

<location>/error.jsp</location>

</error-page>

⑤配置安全认证方式:

<security-constraint>

<web-resource-collection>

<web-resource-name>ProtectedArea</web-resource-name>

<url-pattern>/admin/*</url-pattern>

<http-method>GET</http-method>

<http-method>POST</http-method>

</web-resource-collection>

<auth-constraint>

<role-name>admin</role-name>

</auth-constraint>

</security-constraint>

 

<login-config>

<auth-method>BASIC</auth-method>

</login-config>

 

<security-role>

<role-name>admin</role-name>

</security-role>

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