创建Web应用和Struts框架的配置文件

创建Web应用的配置文件

对于Struts应用，它的配置文件web.XML应该对ActionServlet类进行配置，此外，还应该声明Web应用所使用的Struts标签库，本例中声明使用了三个标签库: Struts Bean、Struts Html和Struts Logic标签库。例程1为web.xml的源代码。

例程1　web.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"

"http://Java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>

<display-name>HelloApp Struts Application</display-name>



<servlet>

<servlet-name>action</servlet-name>

<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

<init-param>

<param-name>config</param-name>

<param-value>/WEB-INF/struts-config.xml</param-value>

</init-param>

<load-on-startup>2</load-on-startup>

</servlet>



<servlet-mapping>

<servlet-name>action</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>



<welcome-file-list>

<welcome-file>hello.jsp</welcome-file>

</welcome-file-list>



<taglib>

<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>

</taglib>

<taglib>

<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-html.tld</taglib-location>

</taglib>

<taglib>

<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>

</taglib>

</web-app>

创建Struts框架的配置文件

正如前面提及的，Struts框架答应把应用划分成多个组件，提高开发速度。而Struts框架的配置文件struts-config.xml可以把这些组件组装起来，决定如何使用它们。例程2是helloapp应用的struts-config.xml文件的源代码。

例程2  struts-config.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">

<!--
This is the Struts configuration file 

for the "Hello!" sample application
-->

<struts-config>

<!-- ======== Form Bean Definitions ==================== -->
    <form-beans>
        <form-bean name="HelloForm" type="hello.HelloForm"/>
    </form-beans>

<!-- ========== Action Mapping Definitions =================== -->
  <action-mappings>
    <!-- Say Hello! -->
    <action    path      = "/HelloWorld"
               type      = "hello.HelloAction"
               name      = "HelloForm"
               scope     = "request"
               validate  = "true"
               input     = "/hello.jsp"
     >
        <forward name="SayHello" path="/hello.jsp" />
    </action>
  </action-mappings>

  <!-- ========== Message Resources Definitions ================ -->
  <message-resources parameter="hello.application"/>

</struts-config>