Question

我尝试编写以下简单的struts但在运行时遇到此错误。

[org.apache.struts2.dispatcher.Dispatcher] Could not find action or result: 
No result defined for action com.peter.action.LoginAction and result success

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"  
    pageEncoding="ISO-8859-1"%>  
<%@ taglib prefix="s" uri="/struts-tags" %>  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
  <body>  
    <h2>Hello Struts</h2>  

    <s:form action="login" >  
      <s:textfield name="username" label="Username:" />  
      <s:password name="password" label="Password:"/>  
      <s:submit />  
    </s:form>  
  </body>  
</html>

LoginAction.java

package com.peter.action;

import org.apache.struts2.convention.annotation.ResultPath;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Action;

import com.opensymphony.xwork2.ActionSupport;

@ResultPath("/")
public class LoginAction extends ActionSupport {

    private String username;
    private String password;

    @Override
    @Action(value = "login", results = 
        {@Result(name="success", location="welcome.jsp")})
    public String execute() {
        return SUCCESS;
    }

    // Getters and setters for username, password    
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <display-name>Struts</display-name>

    <filter>
        <filter-name>Struts_Filter</filter-name>
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
        <init-param>
            <param-name>actionPackages</param-name>
            <param-value>com.peter.action</param-value> 
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>Struts_Filter</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

除运行时错误外，还存在部署错误

错误[com.opensymphony.xwork2.util.finder.ClassFinder]（MSC服务线程1-2）无法阅读课程 [WEB-INF.classes.com.peter.action.LoginAction]：无法加载 WEB-INF / classes / com / peter / action / LoginAction.class - [未知位置] com.opensymphony.xwork2.util.finder.ClassFinder.readClassDef（ClassFinder.java:785） [XWork的核 - 2.3.1.2.jar：2.3.1.2]

AFAIK，struts的扫描方法将扫描名为struts2的默认包，用于任何带注释的类，但我已指示struts2使用init-param在com.peter.action中进行扫描但仍无法找到该类。这很奇怪。

Answer 1

升级到Struts 2.3.8时遇到了同样的问题，除了以WEB-INF.*开头的错误类包，它以WAR文件的名称开头（表示为WarFileName）。我通过将以下行添加到struts.xml来解决它：

<constant name="struts.convention.exclude.packages" value="org.apache.struts.*,org.apache.struts2.*,org.springframework.web.struts.*,org.springframework.web.struts2.*,org.hibernate.*,WarFileName.*"/>

除WarFileName.*之外的所有内容都是默认设置，因此我也包含了这些内容。我希望这有助于某人。

Answer 2

我通过更改为xml映射样式解决了问题。

org.apache.struts2.dispatcher.Dispatcher：找不到操作或结果错误

2 个答案: