Question

我有几个问题，如果有人可以帮我用Struts 2解决这个问题，我会这样做。这就是我遇到的问题。当我运行我的简单登录应用程序时，我有这个错误：

org.apache.jasper.JasperException：找不到Struts调度程序。

这通常是由于使用没有关联过滤器的Struts标签引起的。 Struts标记仅在请求通过其servlet过滤器时可用，该过滤器初始化此标记所需的Struts调度程序。 - [未知位置]

日志就是这个：

Advertencia: StandardWrapperValve[jsp]: PWC1406: Servlet.service() for servlet jsp threw exception
The Struts dispatcher cannot be found.  This is usually caused by using Struts tags without the associated filter. Struts tags are only usable when the request has passed through its servlet filter, which initializes the Struts dispatcher needed for this tag. - [unknown location]
    at org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:60)
    at org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack(StrutsBodyTagSupport.java:44)
    at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:48)
    at org.apache.jsp.Login_jsp._jspx_meth_s_form_0(Login_jsp.java:99)
    at org.apache.jsp.Login_jsp._jspService(Login_jsp.java:72)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:403)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)

文件树就是这个：

            src(es.uniway.action.login as a package and inside this class:
LoginAction.java:

package com.uniway.action.login;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{

@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
return SUCCESS;
}

}

在src内部我还有struts.xml：

<?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="true" />
<constant name="struts.devMode" value="false" />

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

<action name="Login" class="com.uniway.action.LoginAction">
<result name="input">/Login.jsp</result>
<result name="success" type="redirectAction">/index.jsp</result>
</action>


</package>


<!-- Add packages here -->

</struts>

然后在web-info文件夹中我有web.xml我有这个东西：

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>cloud46</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>

<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>


 <welcome-file-list>
 <welcome-file>Login.jsp</welcome-file>

 </welcome-file-list>
 </web-app>

然后在WebContent上我有index.jsp和Login.jsp，我有这段代码：

<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Sign On</title>
</head>

<body>
<s:form action="Login.action"> 
<s:textfield key="username"/>
<s:password key="password" />
<s:submit method="execute"/>
</s:form>  
</body>
</html>

WEB-INF内的lib文件夹中的库包括：asm-3.3.jar，asm-commons-3.3.jar，asm-tree-3.3.jar，commons-fileupload-1.2.2.jar，commons-io-2.0.1.jar，{{ 1}}，commons-lang3-3.1.jar，freemarker-2.3.19.jar，javassist-3.11.0.GA.jar ，ognl-3.0.5.jar，struts2-core-2.3.3.jar。请问，我做错了什么？

Answer 1

这样做改变

<action name="Login" class="com.uniway.action.LoginAction">
<result name="input">/Login.jsp</result>
<result name="success" type="redirectAction">/index.jsp</result>
</action>

要

<action name="Login" class="com.uniway.action.LoginAction">
     <result name="input">/Login.jsp</result>
     <result name="success">/Login.jsp</result>
</action>

更改此

<s:form action="Login.action"> 到

<s:form namespace="/" action="Login">
接着变化

<s:submit method="execute"/>

要

<s:submit value="Login"/>

Answer 2

我的404.jsp页面遇到了这个问题，这是我的解决方案：

我们不应该在404.jsp !!!

中使用<s:标签

我不知道为什么，但这解决了我的问题！

struts 2开发登录的问题

2 个答案: