IDEA Struts2 There is no Action

问题背景：在IDEA使用Struts2，运行后获取不到传入的值或者键值信息没有传入到后台，以及There is no Action mapped for action name propertyAction.
用代码块功能插入代码

- 在com/in/action/api/GetServletAPIAction1.java

package com.in.action.api;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

import java.util.Map;

public class GetServletAPIAction1 extends ActionSupport {
    public GetServletAPIAction1() {
    }

    @Override
    public String toString() {
        return "GetServletAPIAction1{}";
    }


    //1与Servlet解耦合的非IOC方式
    public String execute() throws Exception{

        //1.1获取Action的上下文
        ActionContext context=ActionContext.getContext();
        //1.2相当于获取javax.servlet.http.HttpServletRequest对象
        //Map req=context.getPramters();
        //1.3相当于获取application
        Map as=context.getApplication();
        //1.4相当于获取javax.servlet.http.HttpSession
        Map ses=context.getSession();

        context.put("req","从request范围获取");
        as.put("appl","从application范围获取");
        ses.put("sess","从session范围获取");


        return "success";
    }
}

在com/in/action/api/biaoqian/PropertyAction.java

package com.in.action.api.biaoqian;

import org.apache.struts2.ServletActionContext;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

public class PropertyAction {
     public String execute(){
        HttpServletRequest request=ServletActionContext.getRequest();
        HttpSession session=request.getSession();
        ServletContext application=ServletActionContext.getServletContext();

        request.setAttribute("req","");
        session.setAttribute("sess","session");
        application.setAttribute("app","appli范围");

        return "success";
     }
}

在web/pages/api/servlet_api_1.jsp中

<%@ taglib prefix="s" uri="/struts-tags" %>
<%--
  Created by IntelliJ IDEA.
  User: 戴尔
  Date: 2022/9/13
  Time: 13:46
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<html>
    <head>
        <title>servlet_api_1title>
    head>
    <body>
        <s:debug>s:debug>
        <%
            System.out.println("可以吗？");

        %>
        <%=request.getParameter("req")%><br>
      request:${requestScope.req}<br>
      application:${applicationScope.appl}<br>
      session:${sessionScope.sess}<br>

        <h4>以下使用scope.getAttribute的形式来接受h4>

        request：      <%=request.getAttribute("req") %><br>

        session：       <%=session.getAttribute("sess") %><br>

        application:<%=application.getAttribute("appl") %><br>
    body>
html>

在web/pages/biaoqian/property.jsp中

<%--
  Created by IntelliJ IDEA.
  User: 戴尔
  Date: 2022/9/15
  Time: 8:45
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
    <head>
        <title>Titletitle>
    head>
    <body>
        EL表达式:<br>
        request:${requestScope.req}<br>
        session:${sessionScope.sess}<br>
        application:${applicationScope.app}<br>
        valuestack:${requestScope.request}<br>
        <hr>
        使用struts标签
        request:<s:property value="#request.req">s:property><br>
        session:<s:property value="#session.sess">s:property><br>
        application:<s:property value="#application.app">s:property><br>
        valuestack:${requestScope.request}<br>

    body>
html>

在web/index.jsp中

<%--
  Created by IntelliJ IDEA.
  User: ����
  Date: 2022/9/13
  Time: 13:27
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>

<html>
    <head>
        <title>魔仙堡歌曲title>
    head>

    <body>

        <a href="${pageContext.request.contextPath}/test2/getServletAPIAction1.action">法一a>
        <a href="${pageContext.request.contextPath}/pages/api/servlet_api_1.jsp">法二a>

        <A href="${pageContext.request.contextPath}/test5/propertyAction.action">测试pp标签A>

    body>
html>

在src/struts.xml中



struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <constant name="struts.enable.DynamicMethodInvocation" value="true" />
 
    <package name="in" namespace="/test2" extends="struts-default">

        <action name="getServletAPIAction1" class="com.in.action.api.GetServletAPIAction1">
            <result type="dispatcher">/pages/api/servlet_api_1.jspresult>
        action>
    package>
    
    <package name="in" namespace="/test5"  extends="struts-default">
        <action name="propertyAction" class="com.in.action.api.biaoqian.PropertyAction" method="execute">
            <result type="dispatcher" name="success">/pages/biaoqian/property.jspresult>
        action>
    package>
struts>

在web/WEB-INF/web.xml中



<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <welcome-file-list>
        <welcome-file>index.jspwelcome-file>
    welcome-file-list>
    <filter>
        <filter-name>struts2filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilterfilter-class>
    filter>
    <filter-mapping>
        <filter-name>struts2filter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>
web-app>

**3. 运行结果及报错内容 **

运行index.jsp
显示
点击法一显示

- 问题：找不到name为getServletAPIAction1的action

点击法二显示

- 问题：没有值

点击测试pp标签显示

** 问题：找不到name为propertyAction的action**

**4. 我的解答思路和尝试过的方法 **

尝试过的方法
struts.xml文件配置了，action的名字没有出错
配置包名时,extends=“struts-default”没写错

1. 想要得到结果
得到值；可以访问到action**

已解决：

在struts.xml文件中，如果有多个<package>标签，<package>标签的name属性不可以相同。
（例如:代码中的<package>标签的name都为in，不可以。）
（关于<package>标签作用的参考链接:https://www.cnblogs.com/carazk/p/6392294.html）

参考链接:https://www.cnblogs.com/carazk/p/6392294.html