MyEclipse Struts2 There is no Action mapped for namespace [/] and action name [Login]

问题描述:

最近做 JavaEE 实验,遇到各种奇怪的问题,这里说一个很常见的:
如题所述,在 Struts 配置文件中配置的 Action 无法正常映射。

解决步骤:

1、确保 struts.xml 文件名大小写正确:struts.xml
2、确保 struts.xml 文件在 src 目录下
3、检查 struts.xml action配置

示例:

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>TestStructs</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
        <filter-mapping>
            <filter-name>struts2</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 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <constant name="struts.i18n.encoding" value="gb2312" />
    <package name="default" extends="struts-default">
        <action name="login" class="action.LoginAction">
            <result name="success">/success.jsp</result>
            <result name="error">/error.jsp</result>
        </action>
    </package>
</struts>

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'login.jsp' starting page</title>
  </head>
  <body>
    <s:actionerror/>
    <s:form action="login.action" method="post">
        <s:textfield name="user.username" label="Username"></s:textfield>
        <s:password name="user.password" label="Password"></s:password>
        <s:submit value="Submit"></s:submit>
    </s:form>
  </body>
</html>

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