struts2框架学习1

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <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>
  
  </web-app>

 是过滤为后缀为action

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<package name="default"  extends="struts-default" namespace="/" >

    <action name="BookAction" class="servlet.BookAction">
        <result name="Success">/list.jsp</result>
        <result name="Error">/add.jsp</result>
    </action>
    

    
</package>
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
</struts>    

 动态方法调用：（不建议使用）

<form action="BookAction!add.action" method="post">

动态方法调用是指：表单元素的action不直接等于某个Action的名字，而是以感叹号后加方法名来指定对应的动作名：

这里用动态方法还需在struts里添加

<constant name="struts.enable.DynamicMethodInvocation" value="true" />

在action里用

public String execute() {

        return "";//默认为execute，有具体的方法，调用具体的方法，这里调用add方法。

    }

    public String add() {

      return ""

    }

  使用action标签的method属性,在这个属性里面写执行的方法

    <action name="addAction" class="servlet.BookAction" method="add">
        <result name="Success">/list.jsp</result>
        <result name="Error">/add.jsp</result>
    </action>
    <action name="updateAction" class="servlet.BookAction" method="update">
        <result name="Success">/list.jsp</result>
        <result name="Error">/update.jsp</result>
    </action>

使用通配符的方式实现(重点)

action标签里面name属性,name属性值里面写符号 * 星号  与第二种类似

    <action name="*Action" class="servlet.BookAction" method="{1}">
        <result name="Success">/list.jsp</result>
        <result name="Erroradd">/add.jsp</result>
        <result name="Errorupdate">/update.jsp</result>
    </action>