Struts2动态方法调用小问题

网址：http://www.sjsjw.com/kf_code/article/032909ABA001520.asp

今天，在用Struts2中Action接收参数时，在URL中输入：http://localhost:8080/Struts2_03/user/user!add，出错： 

There is no Action mapped for namespace [/user] and action name [user!add] associated with context path [/Struts2_03].

struts.xml配置为： 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
	
    <constant name="struts.devMode" value="true" />
	<package name="font" namespace="/user" extends="struts-default">
		      
       <action name="user" class="com.zhang.HelloAction">
           <result >
             /Studentadd_success.jsp
           </result>
        </action>
        
    </package>
</struts>

HelloAction.java：

package com.zhang;

import com.opensymphony.xwork2.ActionSupport;

public class HelloAction extends ActionSupport
{
	private String name;
	private int age;
	
	public String add()
	{
		System.out.println("name="+name);
		System.out.println("age+"+age);
		return SUCCESS;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

	public int getAge()
	{
		return age;
	}

	public void setAge(int age)
	{
		this.age = age;
	}
	
}

找来找去，原来是动态方法调用(DMI)这方面出了问题； 
原因：struts2中默认不允许使用DMI； 
所以：需要在配置文件中将这句加上： <constant name="struts.enable.DynamicMethodInvocation" value="true"/> 这样大家在地址栏动态输入就可以得到预期的页面； 
这个属xìng是设置Struts2是否支持动态方法调用，为true时是支持，为false时是关闭动态方法调用！ 
配置后的struts.xml： 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
	<constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="true" />
	<package name="font" namespace="/user" extends="struts-default">
		      
       <action name="user" class="com.zhang.HelloAction">
           <result >
             /Studentadd_success.jsp
           </result>
        </action>
        
    </package>
</struts>