<servlet>
   <servlet-name>spmvc</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
   <servlet-name>spmvc</servlet-name>
  <url-pattern>*.do</url-pattern>   
 </servlet-mapping>

<form action="login.do" method="post">
  username:<input type="text" name = "username" ><p> 
  password:<input type="password" name = "password" ><p>
  <input type="submit" value="登录"> 
</form>

@Controller
public class loginAction {
  
  @RequestMapping("login.do")
  public String login(String username,String password){
    if ("admol".equals(username)) {
      System.out.println(username +" 登录成功");
      return "loginSuccess";//逻辑视图名    跳转页面默认为转发

　　　　　　　 System.out.println(username +" 登录成功");
    }
    return "loginError";
  }  
}

<?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:p="http://www.springframework.org/schema/p"
    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-3.0.xsd">
  <!-- 启用spring mvc注解 -->
  <context:annotation-config></context:annotation-config>
  <!-- 扫描包 -->
  <context:component-scan base-package="com.wjl.web"></context:component-scan>
  
  <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀  如：http://127.0.0.1:8080/springmvc/jsp/****.jsp-->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/jsp/" p:suffix=".jsp"></bean>
</beans>

/**
   * 返回的是一个ModelAndView
   * @param username 页面传递的用户名
   * @param password 页面传递过来的密码
   * @return
   */
  @RequestMapping("login2.do")
  public ModelAndView login2(String username,String password){
    if ("admol".equals(username)) {
      System.out.println(username +" 登录成功2");
      return new ModelAndView("loginSuccess");//逻辑视图名    跳转页面默认为转发
    }
    return new ModelAndView("redirect:/jsp/loginError");//以重定向的方式
  }
  
  /**
   * 传递一个JAVABEAN对象给控制器
   * @param users bean对象
   * @return
   */
  @RequestMapping(value="login3.do",method=RequestMethod.POST)
  public ModelAndView login3(@ModelAttribute("users") Users users){
    if ("admol".equals(users.getUsername()) && "123".equals(users.getPassword())) {
      System.out.println(users.getUsername() +"  "+ users.getPassword());
      return new ModelAndView("loginSuccess");
    }
    return new ModelAndView("redirect:/jsp/loginError.jsp");//以重定向的方式
  }

package com.wjl.bean;

public class Users {  
  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;
  }

}