初学Struts遇到的坑爹问题

主要页面

Action: LoginAction.java //用于处理登陆这个事件

FromBean: LoginForm.java //存储Login.jsp中传过来的表单内容

JSP:Login.jsp //登陆页面，提交到login.do

XML配置文件：struts-config.xml，web.xml

struts-config.xml配置文件：

 1 <struts-config>
 2     <form-beans>
 3         <form-bean name="loginForm" type="cn.strut.form.LoginForm" />
 4     </form-beans>
 5     <action-mappings>
 6         <action path="/login" type="cn.strut.action.LoginAction" name="loginForm">
 7 
 8             <forward name="LoginSuccess" path="/LoginSuccess.jsp"></forward>
 9             <forward name="LoginFailure" path="/LoginFailure.jsp"></forward>
10         </action>
11     </action-mappings>
12 </struts-config>

LoginAction.java

package cn.strut.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import cn.strut.form.LoginForm;

public class LoginAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		// TODO Auto-generated method stub
		
		LoginForm Lf=(LoginForm)form;
		
		System.out.println(Lf.getUserName());       //每次都输出null
		if("AgoniShao".equals(Lf.getUserName()))
		{
			return mapping.findForward("LoginSuccess");
		}
		else
		{
			return mapping.findForward("LoginFailure");
		}
	}

}

LoginForm.java

package cn.strut.form;

import org.apache.struts.action.ActionForm;

public class LoginForm extends ActionForm {
	private String UserName;
	private String PassWord;
	
	public String getUserName() {
		return UserName;
	}
	public void setUserName(String userName) {
		UserName = userName;
	}
	public String getPassWord() {
		return PassWord;
	}
	public void setPassWord(String passWord) {
		PassWord = passWord;
	}
	

}

<body>
    <form action="<%=request.getContextPath() %>/login.do" method="post">
    	UserName:<input type="text" name="UserName" /><br>
    	PassWord:<input type="text" name="PassWord" /><br>
    	<input type="submit" value="OK"/>
    </form>
  </body>

web.xml

 1 <servlet>
 2      <servlet-name>action</servlet-name>
 3      <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
 4      <init-param>
 5          <param-name>config</param-name>
 6          <param-value>/WEB-INF/struts-config.xml</param-value>
 7      </init-param>
 8      <load-on-startup>0</load-on-startup>
 9  </servlet>
10  <servlet-mapping>
11      <servlet-name>action</servlet-name>
12      <url-pattern>*.do</url-pattern>
13  </servlet-mapping>

已知在语法，拼写以及服务器配置方面都是对的，jar包什么的也都正确导入的，但是调试时候会发现无论怎样，运行到LoginAction的时候 LoginForm Lf=(LoginForm)form; 这里的Lf里东西都是空的，即Lf.getUserName()的值都是null 。

感兴趣的朋友可以想想这是什么原因。