spring mvc 简单登录例子

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------------------------------loginactionpackage com.gc.action;import java.net.BindException;import java.util.HashMap;import java.util.Map;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.SimpleFormController;public class Login extends SimpleFormController { //复写 onSubmit @SuppressWarnings("unchecked") public ModelAndView onSubmit(Object command,BindException errors) throws Exception{  User user=(User)command;  //Map model=(() errors).getModel();  Map model=new HashMap();  model.put("user",user);    return new ModelAndView(getSuccessView(),model);     } }-----------------------------------User 类package com.gc.action;public class User {  private String username=null; private String password=null; private String password2=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; } public String getPassword2() {  return password2; } public void setPassword2(String password2) {  this.password2 = password2; } }------------------UserValidator 类 package com.gc.action;import org.springframework.validation.Errors;import org.springframework.validation.Validator;public class UserValidator implements Validator { public boolean supports(Class arg0) {  // TODO Auto-generated method stub  return arg0.equals(User.class); } public void validate(Object obj, Errors errors) {        User user=(User)obj;        if(!"gf".equals(user.getUsername()))        {         errors.rejectValue("username", "",null,"用户名不正确");        }                if(!"123456".equals(user.getPassword()))        {         errors.rejectValue("password", "",null,"密码不正确");        }        if(!user.getPassword().equals(user.getPassword2()))        {         errors.rejectValue("password2", "",null,"2次输入的密码不一致");        }                   }} -----------------------------dispatcherServlet-servlet.xml<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans>    <!-- 定义映射 -->    <bean id="urlMapping"        class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">                <property name="mappings">            <props>                <prop key="login.do">login</prop>            </props>        </property>                           </bean>     <bean id="viewResolver"        class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="viewClass">            <value>org.springframework.web.servlet.view.InternalResourceView</value>        </property>        <!-- 定义JSP存放路径 -->         <property name="prefix">            <value>/WEB-INF/jsp/</value>         </property>         <!-- 定义JSP页面后缀 -->         <property name="suffix">            <value>.jsp</value>         </property>             </bean>    <!-- 定义控制器 -->    <bean id="login" class="com.gc.action.Login">        <property name="commandClass">            <value>com.gc.action.User</value>        </property>        <property name="validator">            <ref bean="userValidator"/>        </property>                <property name="formView">             <value>login</value>        </property>                <property name="successView">             <value>success</value>        </property>    </bean>           <bean id="userValidator" class="com.gc.action.UserValidator"></bean></beans>----------------------------login.jsp<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib prefix="spring" uri="/spring" %><html><head><title>SpringMVC登录实例</title></head><body>   <form name="User" action="/springmvc/login.do" method="post">       <spring:bind path="command.username">            输入用户名 :<input type="text" name="${status.expression}" value="${status.value}"/>      <font color="red"><b>${status.errorMessage} </b></font><br>       </spring:bind>       <spring:bind path="command.password">            密码：<input type="text" name="${status.expression}" value="${status.value}"/>      <font color="red"><b>${status.errorMessage} </b></font><br>       </spring:bind>     <spring:bind path="command.password2">            确认密码：<input type="text" name="${status.expression}" value="${status.value}"/>      <font color="red"><b>${status.errorMessage} </b></font><br>       </spring:bind>         <input type="submit" value="提交">    </form></body></html>---------------------------------------------------------------
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