struts2使用通配符调用action

<?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="student" namespace="/student" extends="struts-default">
		<action name="*_*" class="com.dbj.action.{1}Action" method="{2}">
			<result>/hello.jsp</result>
		</action>
		<action name="Student_add" class="com.dbj.action.StudentAction" method="add">
			<result>/index.jsp</result>
		</action>
	</package>
</struts>

Java后台代码：

public class StudentAction extends ActionSupport{

	public String add() {
		System.out.println("add");
		return SUCCESS;
	}
	
	public String update() {
		System.out.println("update");
		return SUCCESS;
	}
	
	public String search() {
		System.out.println("search");
		return SUCCESS;
	}
}

　　浏览器URL：http://localhost:8080/01Struts2/student/Student_add.action

action name="*_*"中的第一个*匹配的是Student，第二个*匹配add；

class="com.dbj.action.{1}Action" method="{2}"：{1}=Student,{2}=add;

调用结果返回hello.jsp；
如果配置文件中有一个action的名称和Student_add完全匹配，则调用匹配最精确地action
如上述配置文件中则返回index.jsp;