通配符映射

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一个web应用可能有成百上千个action声明，可以利用Struts提供的通配符映射机制把多个彼此相似的映射关系简化为一个映射关系

1.index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <a href="UserAction-save">User Save</a>    <br><br>    <a href="UserAction-update">User Update</a>    <br><br>    <a href="UserAction-delete">User Delete</a>    <br><br>    <a href="UserAction-query">User Query</a></body></html>

2.struts.xml

**重点：
若找到多个匹配，没有通配符的胜出
若找到不止一个通配符的匹配，按先后顺序匹配**

<?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><!-- 配置Struts可以受理的请求的扩展名 --><constant name="struts.action.extension" value="action,do,"></constant><package extends="struts-default" name="Hello" namespace="/">       <action name="UserAction-*" class="TestAction.UserAction"        method="{1}">        <result name="{1}-success">/success.jsp</result>        </action>    <action name="*-update" class="TestAction.UserAction"        method="test">        <result name="query-success">/success.jsp</result>      </action>    <!--      <action name="UserAction-save" class="TestAction.UserAction"        method="test">        <result name="query-success">/success.jsp</result>      </action>    --></package></struts>

3.UserAction.java

package TestAction;public class UserAction {    public String save()    {        System.out.println("save");        return "save-success";    }    public String update()    {        System.out.println("update");        return "update-success";    }    public String delete()    {        System.out.println("delete");        return "delete-success";    }    public String query()    {        System.out.println("query");        return "query-success";    }    public String test()    {        System.out.println("test");        return "query-success";    }}

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