問題描述
在搭建struts2環境的時候，拷貝了web.xml，拷貝了struts.xml，拷貝了jar包。運行，正常，訪問jsp頁面，報404錯誤。
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://xmlns.jcp.org/xml/ns/javaee"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"id="WebApp_ID" version="3.1"><display-name>hellostruts2</display-name><filter><filter-name>struts</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>struts</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd">
<struts><package name="xxxx" extends="struts-default"><action name="hello" class="com.zengmg.strtus.HelloAction" method="execute"><result name="success">/success.jsp</result></action></package></struts>訪問：
http://localhost:8080/strutsfiledemo/success.jsp。報 404！
原因：
因為struts.xml配置了的action沒有java類與其對應，所以報錯。但是我沒把控制臺的信息拉到上面看，導致沒看到信息。
Caused by: Action class [com.zengmg.strtus.HelloAction] not found - action - file:/E:/apache-tomcat-8.0.26/webapps/strutsfiledemo/WEB-INF/classes/struts.xml:8:82
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyAction(XmlConfigurationProvider.java:434)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:378)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:495)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:286)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:234)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
... 16 more
解決方法：
把struts.xml的action刪了，或者寫好java類，配置正確action。
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