SpringMVC

web.xml

 <servlet>
      <servlet-name>DispatcherServlet</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:applicationContext.xml</param-value>
      </init-param>
  </servlet>
  
  <servlet-mapping>
          <servlet-name>DispatcherServlet</servlet-name>
          <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  

applicationContext.xml

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    
    <!-- 配置Controller类 -->
    <bean id="loginControl" class="com.fengyi.control.LoginContorller">
        <property name="failView" value="index"/>
        <property name="successView" value="show"/>
    </bean>
    <!-- 配置Controller 和 URL 的映射关系！ -->
    <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <props>
                <prop key="/login.do">loginControl</prop>            
            </props>    
        </property>
    </bean>
    <!-- 配置试图解析器  jsp freemark... -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

Controller.java

package com.fengyi.control;

import java.util.HashMap;
import java.util.Map;

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

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

import com.fengyi.entity.Users;

public class LoginContorller extends AbstractController {

    private String failView ;
    private String successView ;
    public String getFailView() {
        return failView;
    }
    public void setFailView(String failView) {
        this.failView = failView;
    }
    public String getSuccessView() {
        return successView;
    }
    public void setSuccessView(String successView) {
        this.successView = successView;
    }
    
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        
        String name = request.getParameter("username");
        String password = request.getParameter("password");
        
        Users user = getUser(name, password) ;
        Map<String , Object>model = new HashMap<String, Object>();
        
        if(user!=null)
        {
            model.put("user", user);
            return new ModelAndView(successView , model);
        }
        //失败时返回的信息
        model.put("error", "输入的用户名称或者密码错误！");
        return new ModelAndView(failView , model);
    }
    //业务逻辑方法
    private Users getUser(String username , String password)
    {
        if("123".equals(username)&&"123".equals(password))
        {
            Users user = new Users ();
            user.setPassword("123");
            user.setUsername("123");
            return user ;
        }
        return null ;
    }
}