struts2 访问不存在的action时，自动跳转

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struts 404 not found action不存在 404跳转

struts 中访问不存在的action时，默认的会显示如下页面：

这显然不友好。能不能跳转到统一的action进行处理呢？

struts 可以做到。

struts.xml配置文件如下：

<?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="false" />
	<constant name="struts.devMode" value="true" />
	<constant name="struts.ui.theme" value="simple" />
	<constant name="struts.objectFactory" value="spring" />
	<constant name="struts.xwork.chaining.copyMessages" value="true" />
	<constant name="struts.multipart.maxSize" value="58871540" /><!-- 
		50 MB -->

	<constant name="struts.xwork.chaining.copyErrors" value="true" />



	<package name="default" namespace="/" extends="struts-default">

		<interceptors>
			<!-- <interceptor name="authorityInterceptor"
				class="com.shop.jn.interceptor.AuthorityInterceptor"></interceptor> -->
			<interceptor name="loggerInterceptor"
				class="com.shop.jn.interceptor.LoggerInterceptor"></interceptor>
			<interceptor name="loginTimesLimitInterceptor"
				class="com.shop.jn.interceptor.LoginTimesLimitInterceptor"></interceptor>
			<interceptor name="jsonIntercept"
				class="com.shop.jn.interceptor.JSONInterceptor"></interceptor>
			<!-- minimum interceptor stack -->
			<interceptor-stack name="minStack">
				<interceptor-ref name="defaultStack"></interceptor-ref>
				<interceptor-ref name="loggerInterceptor"></interceptor-ref>
				<!-- -->
			</interceptor-stack>
			<!-- authority check when access resource -->
			<interceptor-stack name="authorityStack">
				<interceptor-ref name="defaultStack"></interceptor-ref>
				<!-- <interceptor-ref name="authorityInterceptor"></interceptor-ref> -->
				<interceptor-ref name="loggerInterceptor"></interceptor-ref>
			</interceptor-stack>
			<!-- <interceptor-stack name="loginTimesLimitStack"> <interceptor-ref 
				name="defaultStack"></interceptor-ref> <interceptor-ref name="loggerInterceptor"></interceptor-ref> 
				<interceptor-ref name="loginTimesLimitInterceptor"></interceptor-ref> </interceptor-stack> -->
		</interceptors>
		<default-interceptor-ref name="authorityStack"></default-interceptor-ref>
		<!-- <default-action-ref name="index" /> -->

		<default-action-ref name="notFound" />

		<global-results>
			<result name="error">/error.jsp</result>
			<result name="login2">/user/loginInput.jsp</result>
		</global-results>

		<action name="notFound" class="com.shop.jn.action.error.NotFoundErrerAction">
			<result name="success">/not_found.jsp</result>
		</action>
		<!--<global-exception-mappings> <exception-mapping exception="java.lang.Exception" 
			result="error" /> </global-exception-mappings> --><!--<action name="index"> <result type="redirectAction"> </result> </action> -->
	</package>

	<package name="goods22" extends="struts-default" namespace="/goods">
		<action name="*Goods" class="{1}GoodsAction">
			<result type="redirectAction">
				<param name="namespace">/goods</param>
				<param name="actionName">viewGoods</param>
			</result>
			<result name="input">/input.jsp</result>
		</action>

		<!-- this is a exception ,must not use wildcard -->
		<action name="viewGoods" class="viewGoodsAction">
			<result>/goods/viewGoods.jsp</result>
		</action>
		<action name="addInputGoods" class="addInputGoodsAction">
			<result>/goods/addGoods.jsp</result>
		</action>

		<action name="updateInputGoods" class="updateInputGoodsAction">
			<result>/goods/addGoods.jsp</result>
		</action>
	</package>

	<package name="supermarket22" extends="default" namespace="/supermarket">
		<action name="*Supermarket" class="{1}SupermarketAction">
			<result type="redirectAction">
				<param name="namespace">/supermarket</param>
				<param name="actionName">viewSupermarket</param>
			</result>
		</action>
		<!-- this is a exception ,must not use wildcard -->
		<action name="viewSupermarket" class="viewSupermarketAction">
			<result>/supermarket/viewSupermarket.jsp</result>
		</action>

		<action name="updateInputSupermarket" class="updateInputSupermarketAction">
			<result>/supermarket/addSupermarket.jsp</result>
		</action>
	</package>

</struts>

在上述struts.xml文件中，我配置了default-action-ref，默认action的名称是”notFound“，对应的java类是”com.shop.jn.action.error.NotFoundErrerAction“：

package com.shop.jn.action.error;

import com.opensymphony.xwork2.ActionSupport;

public class NotFoundErrerAction extends ActionSupport {

	private static final long serialVersionUID = 6218614965524501080L;
	@Override
	public String execute() throws Exception {
		System.out.println("您访问的action 不存在!");
		return super.execute();
	}
}

访问notFound action时，跳转到的页面是：not_found.jsp，

not_found.jsp 内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
</head>
<body>
<h1>
<font color="red" >not found</font>
</h1>
</body>
</html>

在浏览器中显示界面如下：

继续说明struts.xml文件：

package goods22继承了struts-default（struts默认的package），命名空间是”/goods“；而package supermarket22 继承了default（default中配置了默认的action），命名空间是”/supermarket“。

default 是我自定义的package。

我们在浏览器地址栏中输入：http://localhost:8080/shop_goods/supermarket/xxx.action

上述url对应的action是不存在的！

结果如下：

达到了我们的需求。

但是我在浏览器地址栏中输入：
http://localhost:8080/shop_goods/goods/xxx.action
时，结果如下：

没有达到我们的需求，为什么没有跳转到默认action呢？

因为上述url对应的命名空间（namespace）是/goods，而该package 并没有继承default package。访问http://localhost:8080/shop_goods/supermarket/xxx.action 就可以到达默认action，因为supermarket 继承了default package 。

如何解决上述问题呢？

方式一：

删除package default 的namespace，这样不论package 目录结构如何只要找不到action，就会跳转到默认daction；

struts.xml 部分代码如下：

<package name="default"  extends="struts-default">

		<interceptors>
			<!-- <interceptor name="authorityInterceptor"
				class="com.shop.jn.interceptor.AuthorityInterceptor"></interceptor> -->
			<interceptor name="loggerInterceptor"
				class="com.shop.jn.interceptor.LoggerInterceptor"></interceptor>
			<interceptor name="loginTimesLimitInterceptor"
				class="com.shop.jn.interceptor.LoginTimesLimitInterceptor"></interceptor>
			<interceptor name="jsonIntercept"
				class="com.shop.jn.interceptor.JSONInterceptor"></interceptor>
			<!-- minimum interceptor stack -->
			<interceptor-stack name="minStack">
				<interceptor-ref name="defaultStack"></interceptor-ref>
				<interceptor-ref name="loggerInterceptor"></interceptor-ref>
				<!-- -->
			</interceptor-stack>
			<!-- authority check when access resource -->
			<interceptor-stack name="authorityStack">
				<interceptor-ref name="defaultStack"></interceptor-ref>
				<!-- <interceptor-ref name="authorityInterceptor"></interceptor-ref> -->
				<interceptor-ref name="loggerInterceptor"></interceptor-ref>
			</interceptor-stack>
			<!-- <interceptor-stack name="loginTimesLimitStack"> <interceptor-ref 
				name="defaultStack"></interceptor-ref> <interceptor-ref name="loggerInterceptor"></interceptor-ref> 
				<interceptor-ref name="loginTimesLimitInterceptor"></interceptor-ref> </interceptor-stack> -->
		</interceptors>
		<default-interceptor-ref name="authorityStack"></default-interceptor-ref>
		<!-- <default-action-ref name="index" /> -->

		<default-action-ref name="notFound" />

		<global-results>
			<result name="error">/error.jsp</result>
			<result name="login2">/user/loginInput.jsp</result>
		</global-results>

		<action name="notFound" class="com.shop.jn.action.error.NotFoundErrerAction">
			<result name="success">/not_found.jsp</result>
		</action>
		<!--<global-exception-mappings> <exception-mapping exception="java.lang.Exception" 
			result="error" /> </global-exception-mappings> --><!--<action name="index"> <result type="redirectAction"> </result> </action> -->
	</package>

方式二：

让所有的package 都继承我自定义的package default