Hello World

controller

public class HelloWorldController implements Controller {
public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
//1、收集参数、验证参数
//2、绑定参数到命令对象
//3、将命令对象传入业务对象进行业务处理
//4、选择下一个页面
ModelAndView mv = new ModelAndView();
//添加模型数据 可以是任意的POJO对象
mv.addObject("message", "Hello World!!!!");
//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setViewName("hello");
return mv;
}
}

jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

${message} message=<%=request.getParameter("message")%>

web.xml

Archetype Created Web Application mymvct org.springframework.web.servlet.DispatcherServlet 1 mymvct /

mymvct-servlet.xml

<!-- HandlerMapping -->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>

<!-- HandlerAdapter -->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

<!-- ViewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/pages/"/>
    <property name="suffix" value=".jsp"/>
</bean>

<!-- 处理器 -->
<bean name="/hello" class="cn.myspringmvct.chapter2.web.controller.HelloWorldController"/>

在csdn论坛找到了问题的原因：maven自动生成的web.xml有问题，schema写的不对，修改后可以正确取值：
web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app  version="2.5"
        xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name>Archetype Created Web Application</display-name>

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

</web-app>