创建Web应用和Struts框架的配置文件

2008-02-23 07:47:56来源：互联网阅读 ()

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2-7为web.xml的源代码。

例程2-7  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>

  

 <!-- Standard Action Servlet Configuration  -->

  <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>



  <!-- Standard Action Servlet Mapping -->

  <servlet-mapping>

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

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

  </servlet-mapping>



  <!-- The Usual Welcome File List -->

  <welcome-file-list>

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

  </welcome-file-list>



  <!-- Struts Tag Library Descriptors -->

  <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框架允许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2-8是helloapp应用的struts-config.xml文件的源代码。

例程2-8  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>

以上代码对helloapp应用的HelloForm、HelloAction和消息资源文件进行了配置，首先通过<form-bean>元素配置了一个ActionForm Bean，名叫HelloForm，它对应的类为hello.HelloForm：
<form-bean name="HelloForm" type="hello.HelloForm"/>

接着通过元素配置了一个Action组件：

<action    path      = "/HelloWorld"

          type      = "hello.HelloAction"

          name     = "HelloForm"

          scope     = "request"

          validate   = "true"

             input     = "/hello.jsp"

>

        <forward name="SayHello" path="/hello.jsp" />

</action>

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