提交后就报这个错：The requested resource (There is no Action mapped for action name Sum.)

问题描述：

The requested resource (There is no Action mapped for action name Sum.) is not available.

下面是代码，很简单的，提示是说没这个映射，麻烦把为什么这样改说下，谢谢
目录：
[img]http://dl.iteye.com/upload/attachment/537165/b3d62be5-0cbd-3cf4-a7e2-aaf56e543c79.jpg[/img]

struts.xml
[code="java"]<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

/page/positive.jsp
/page/negative.jsp

[/code]

web.xml
[code="java"]<?xml version="1.0" encoding="UTF-8"?>
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">
Spec Builder

struts2

org.apache.struts2.dispatcher.FilterDispatcher

struts2
/*

[/code]

sum.jsp
[code="java"]<%@ page language="java" import="java.util.*" pageEncoding="GBK" %>
<%@ taglib prefix="s" uri="/struts-tags"%>

输入操作数

  <body>
       求代数和
      <br/>
      <s:form action="Sum">                
          <s:textfield name="operand1" label=" 操作数1"/>
          <s:textfield name="operand2"  label=" 操作数2" />        
          <s:submit value="代数和" />            
      </s:form>
  </body>

[/code]

FirstAction.java
[code="java"]package action;

import com.opensymphony.xwork2.ActionSupport;

public class FirstAction extends ActionSupport
{
private int operand1;
private int operand2;

public String execute() throws Exception
{
    if (getSum() >= 0)  // 如果代码数和是非负整数，跳到positive.jsp页面
    {
        return "positive";
    }
    else  // 如果代码数和是负整数，跳到negative.jsp页面
    {
        return "negative";
    }
}

public int getOperand1()
{
    return operand1;
}

public void setOperand1(int operand1)
{
    System.out.println(operand1);
      this.operand1 = operand1;
}

public int getOperand2()
{
    return operand2;
}  
public void setOperand2(int operand2)
{
    System.out.println(operand2);
    this.operand2 = operand2;
}
public int getSum()
{
    return operand1 + operand2;  // 计算两个整数的代码数和
}

}
[/code]

答

你这个URL生成没有命名空间是../Sum.action

/page/positive.jsp

/page/negative.jsp

你这个要../struts2/Sum.action才能访问到吧

提交后就报这个错：The requested resource (There is no Action mapped for action name Sum.)

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