我们在配置一个action的时候，为了避免下Action类的每个方法都映射成一个action 我们可以这样配置：
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="*User" method="{1}" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
</package>
</struts>
以前我们是：
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="User" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
<action name="addUser" method="add" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
<action name="updateUser" method="update" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
<action name="deleteUser" method="delete" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
</package>
</struts>
写了比较多的重复代码，现在struts2支持动态方法调用，以通配符的形式来查找对应的方法。
下面我们写java代码
package vaannila;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
private String message;
public String execute()
{
message = "Inside execute method";
return SUCCESS;
}
public String add()
{
message = "Inside add method";
return SUCCESS;
}
public String update()
{
message = "Inside update method";
return SUCCESS;
}
public String delete()
{
message = "Inside delete method";
return SUCCESS;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
最后就是我们访问action的url怎么写呢？
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<s:form action="User" >
<s:submit />
<s:submit action="addUser" value="Add" />
<s:submit action="updateUser" value="Update" />
<s:submit action="deleteUser" value="Delete" />
</s:form>
</body>
</html>
addUser匹配在strut2中配置的*User，那么add将会被作为了方法的名字到UserAction查找叫add的方法。这样就实现了动态方法的关系映射。
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