Struts2 配置

　在web.xml配置文件中（class在struts-core的jar包中）
  <!-- 中央控制器 -->
  <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>

struts.xml验证在struts-core的jar包的struts-2.3.dtd文件中
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

在struts.xml文件中修改后缀(下文配置代表后缀为 jspx和空的后缀)

 <constant name="struts.action.extension" value = "jspx,"></constant>  

name在url中的路径，method为调用后台方法的方法名
result标签中name属性为方法返回的字符串，默认为"success"
<package name="mypackage" extends="struts-default">
            <action name="home" class="com.peng.action.HomeAction" method="add">
                <result name="success">/WEB-INF/views/home.jsp</result>
            </action>
        
            <action name="login" class="com.peng.action.HomeAction" method="login">
                <result name="success">/WEB-INF/views/home.jsp</result>
            </action>
 </package>

在struts-core.jar包的struts-default.xml文件中定义了跳转类型。
result-type标签的name,对应result的type属性。
<result-types>
            <result-type name="chain" class="com.opensymphony.xwork2.ActionChainResult"/>
            <result-type name="dispatcher" class="org.apache.struts2.dispatcher.ServletDispatcherResult" default="true"/>
            <result-type name="freemarker" class="org.apache.struts2.views.freemarker.FreemarkerResult"/>
            <result-type name="httpheader" class="org.apache.struts2.dispatcher.HttpHeaderResult"/>
            <result-type name="redirect" class="org.apache.struts2.dispatcher.ServletRedirectResult"/>
            <result-type name="redirectAction" class="org.apache.struts2.dispatcher.ServletActionRedirectResult"/>
            <result-type name="stream" class="org.apache.struts2.dispatcher.StreamResult"/>
            <result-type name="velocity" class="org.apache.struts2.dispatcher.VelocityResult"/>
            <result-type name="xslt" class="org.apache.struts2.views.xslt.XSLTResult"/>
            <result-type name="plainText" class="org.apache.struts2.dispatcher.PlainTextResult" />
        </result-types>

请求转发：
chain  → 到action
dispatcher(默认) →到jsp
重定向：
redirect →到jsp
redirectAction →到action

<action name="add" class="com.peng.action.HomeAction" method="add">
                <!--重定向到action  -->
                <result name="success" type="redirectAction">
                    <param name="actionName">login</param>
                    <!-- login?code=1001 -->
                    <param name="code">1001</param>
                </result>
                <!--请求转发到cation  -->
                <result name="input" type="chain">
                    <param name="actionName">login</param>
                </result>
            </action>

struts2 标签库在struts2-core.jar→META-INF→struts-tag.tld
<!--jsp引用-->
<%@ taglib prefix="s" uri="/struts-tags"%>