Struts2动态方法调用（DMI）的三种方法

1.使用Action中的method属性

UserAction.java

package org.bigjava.web.action;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {

	public String login() throws Exception {
		return "login";
	}

}

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>

	<constant name="struts.devMode" value="true" />

	<package name="user" extends="struts-default" namespace="/">
		<action name="login" class="org.bigjava.web.action.UserAction"
			method="login">
			<result name="login">
				/welcome.jsp
			</result>
		</action>
	</package>
</struts>    

index.jsp

  <body>
	<a href="login.action">Login</a>
  </body>

<body>
This is welcome JSP page.
</body>

2.使用!调用(不推荐使用）

UserAction.java

package org.bigjava.web.action;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {
	public String add() throws Exception {
		return "add";
	}
	
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		return SUCCESS;
	}

}

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>

	<constant name="struts.devMode" value="true" />
	<!-- 开启动态调用 -->
	<constant name="struts.enable.DynamicMethodInvocation" value="true" />
	
	<package name="user" extends="struts-default" namespace="/">
		<action name="user" class="org.bigjava.web.action.UserAction" method="login">
			<result name="add">
				/add.jsp
			</result>
		</action>
	</package>
</struts>    

index.jsp

<body>
	<a href="user.action">Login</a><br />
	<a href="user!add">add</a>
  </body>

3.使用通配符(推荐使用)

UserAction.java

package org.bigjava.web.action;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {

	public String login() throws Exception {
		return "login";
	}
	
	public String update() throws Exception {
		return "update";
		
	}
	
	public String delete() throws Exception {
		return "delete";
	}
	
	public String add() throws Exception {
		return "add";
	}
	
}

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>

	<constant name="struts.devMode" value="true" />
	<!-- 开启动态调用 -->
	<constant name="struts.enable.DynamicMethodInvocation" value="true" />
	
	<package name="user" extends="struts-default" namespace="/">	
		<!--{1}表示第一个*，{2}表示第二个* -->
		<action name="*_*" class="org.bigjava.web.action.{1}" method="{2}">
			<result name="{2}">
				/{2}.jsp
			</result>
		</action>
	</package>
</struts>    

index.jsp

<body>
	<a href="UserAction_login">login</a>
	<a href="UserAction_add">add</a>
	<a href="UserAction_update">update</a>
	<a href="UserAction_delete">delete</a>
  </body>