利用Spring IOC技术实现用户登录验证机制

package com.importnew;

public class User {
  private String username;
  private String password;
  
  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;
  }
}

package com.importnew;

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

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class TestUtil extends AbstractController{
  
  private User user;

  public User getUser() {
    return user;
  }
  public void setUser(User user) {
    this.user = user;
  }
  @Override 
  protected ModelAndView handleRequestInternal(HttpServletRequest arg0,
      HttpServletResponse arg1) throws Exception {
    String username = arg0.getParameter("username");
    String password = arg0.getParameter("password");
    if(username.equals(user.getUsername()) && password.equals(user.getPassword())){
      return new ModelAndView("yes");
    }else{
      
      return new ModelAndView("Error");
    }
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:tx="http://www.springframework.org/schema/tx"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd">
    
   <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="prefix">
       <value>/</value>
     </property>
     <property name="suffix">
       <value>.jsp</value>
     </property>
   </bean>
   
   <bean id="user" class="com.importnew.User" >
     <property name="username">
       <value>admin</value>
     </property>
     <property name="password">
       <value>123</value>
     </property>
   </bean>
   
   <bean autowire="byName" id="testUtil" class="com.importnew.TestUtil" >
     <property name="user">
       <ref bean="user"/>
     </property>
   </bean>
</beans>

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
 <display-name>Archetype Created Web Application</display-name>
 <servlet>
     <servlet-name>dispatcherServlet</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>/applicationContext.xml</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
     <servlet-name>dispatcherServlet</servlet-name>
     <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 
</web-app>