警告: No configuration found for the specified action: '/HelloWorld'

struts2的配置问题
因为有个项目需要用到Struts2, 所以照着书上的例子从最简单的HelloWorlod学起,可是总是报404找不到网页的错误,找了半天就是不知道什么原因,郁闷了

首先我的项目名称叫Struts2_HelloWorld,我在项目下的src目录下新建了一个HelloWorld类,如下:

package tutorial;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorld extends ActionSupport
{
private static final long serialVersionUID = 1L;
private String name;

public String getName
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public String execute()
{
name = "Hello, " + name + "!";

return SUCCESS;
}
}

该目录下还有struts.properties文件和struts2.xml文件

struts.properties文件内容如下:

struts.locale = en_GB

struts2.xml文件内容:

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<include file="struts-default.xml"/>
<package name="tutorial" extends="struts-default">
<action name="HelloWorld" class="tutorial.HelloWorld">
<result>HelloWorld.jsp</result>
</action>
</package>
</struts>

另外连个jsp文件分别是sayHello.jsp:
<%@ page language="java" contentType="text/html;charset=gb2312" %>
<%@ taglib prefix="s" uri="/struts-tags"%>

<body>
<h3:>Say "Hello" to:</h3>
<s:form action="HelloWorld">
Name:<s:textfield name="name"/>
<s:submit/>
</s:form>
</body>

HelloWorld.jsp文件如下:

<%@ page language="java" contentType="text/html;charset=gb2312"%>
<%@ taglib prefix="s" uri="/struts-tags"%>

<body>
<h3><s:property value="name"/></h3>
</body>

我现在浏览器输入http://localhost:8080/Struts2_HelloWorld/sayHello.jsp
我输入内容提交以后就报404的错误:
HTTP Status 404 - /Struts2_HelloWorld/HelloWorld

--------------------------------------------

type Status report

message /Struts2_HelloWorld/HelloWorld

description The requested resource (/Struts2_HelloWorld/HelloWorld) is not available.

--------------------------------------------

Apache Tomcat/5.5.20

后台出现两条警告:

信息: Server startup in 7109 ms
2011-4-6 7:35:16 org.apache.struts2.components.Form evaluateExtraParamsServletRequest
警告: No configuration found for the specified action: '/HelloWorld' in namespace: ''. Form action defaulting to 'action' attribute's literal value.
2011-4-6 7:35:18 org.apache.struts2.components.Form evaluateExtraParamsServletRequest
警告: No configuration found for the specified action: '/HelloWorld' in namespace: ''. Form action defaulting to 'action' attribute's literal value.

我在配置文件里面把路径弄了半天还是这个错,真是郁闷了

[解决办法]
我按照你写的再重写一遍：
Action类HelloWorld 代码如下：

Java code

package tutorial;import com.opensymphony.xwork2.ActionSupport;public class HelloWorld extends ActionSupport {    private static final long serialVersionUID = 1L;    private String name;    public String getName {        return name;    }    public void setName(String name){        this.name = name;    }    public String sayHelloWorld(){        name = "Hello, " + name + "!";        return "sayHello";    }} 
 
[解决办法]
struts.xml的问题，提示你 namespace 不能是""  可以写
&lt;package name="admin_config" namespace="/main" extends="struts-default"&gt;

引用时 /main/HelloWorld.action 就可以
[解决办法]
&lt;package name="tutorial" extends="struts-default" namespace="/"&gt;

警告: No configuration found for th

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