Form 为空的问题
各位，本人是菜鸟，建了个工程测试struts登录，当点击subset时报空指针，哪位仁兄指点一下。
- Java code
package com.isoftstone.Test.form;import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionErrors;import org.apache.struts.action.ActionMapping;import org.apache.struts.validator.ValidatorForm;public class LoginForm extends ValidatorForm { private String userName; private String password; @Override public void reset(ActionMapping mapping, HttpServletRequest request) { System.out.println("--------LoginAcionForm.reset()--------"); } /* (non-Javadoc) * @see org.apache.struts.action.ActionForm#validate(org.apache.struts.action.ActionMapping, javax.servlet.http.HttpServletRequest) */ @Override public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { System.out.println("-----LoginAcitonForm.validate()"); // UserManager.getInstance().login(username, password); return null; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; }}下面是action
- Java code
package com.isoftstone.Test.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 com.isoftstone.Test.dao.UserDAO;import com.isoftstone.Test.form.LoginForm;public class LoginAction extends Action{ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){ LoginForm loginForm = (LoginForm)form; System.out.println(loginForm.getUserName()); UserDAO dao = new UserDAO(); if(dao.check(loginForm.getUserName())){ return mapping.findForward("success"); }else{ return mapping.findForward("error"); } }}这是jsp页面
- HTML code
<%@ page language="java" pageEncoding="gb2312"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %><%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %><%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %><%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html:html lang="true"> <head> <html:base /> <title>login.jsp</title> </head> <body> <form action="/Test/login.do" method="post"> username：<input type=text name="userName" size="15"/><br> password：<input type=password name="password" size="15"/><br> <input type="submit" value="submit"> <input type="reset" value="reset"> </form> </body></html:html>
[解决办法]
伙计,写代码的时候小心点,
你看看
这是你的form定义 <form-bean name="LoginForm" type="com.isoftstone.Test.form.LoginForm" />
再看看你的引用
<action
input="/login.jsp"
name="loginForm"
path="/login"
scope="request"
type="com.isoftstone.Test.action.LoginAction" >
这你能取到值吗?