@Controller
public class RequestController{
 @RequestMapping("/resp")
  public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {

     resp.getWriter().println("hello HttpServletResponse");

  }

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
     version="3.1">

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

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

  <!--作用是扫描指定包下所有的包含注解的类-->
  <context:component-scan base-package="com.jsu.mvc"/>

</beans>

  @RequestMapping("/resp")
  public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {

    resp.sendRedirect("index.jsp");

  }
}

@RequestMapping("/resp")
  public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
    req.setAttribute("message","it's forword ");
    req.getRequestDispatcher("index.jsp").forward(req,resp);
    }

 @RequestMapping("/nice")
  public String hello1(){
    //转发方式1
    return "home.jsp";
    //转发方式2
    return "forward:index.jsp";
    //重定向方式
    return "redirect:index.jsp";
  }

 @RequestMapping("/nice")
  public String hello1(){
    //转发方式1
    return "home";
    //转发方式2
    return "forward:index";
    //重定向方式 hello指的是requsrmapping
    return "redirect:hello";
  }

public class HelloController implements Controller {


  @Override
  public ModelAndView handleRequest(javax.servlet.http.HttpServletRequest httpServletRequest,
                   javax.servlet.http.HttpServletResponse httpServletResponse) throws Exception {

    ModelAndView mv = new ModelAndView();
    //封装要显示到视图的数据
    mv.addObject("msg","hello myfirst mvc");
    //视图名
    mv.setViewName("hello");
    return mv;

  }
}

<!--配置渲染器-->
  <!--配置hellocontroller中页面的位置-->

  <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
  <bean id="viewResolver"
           class="org.springframework.web.servlet.view.UrlBasedViewResolver">
  <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
  <!--结果视图的前缀-->
  <property name="prefix" value="/WEB-INF/jsp/"/>
  <!--结果视图的后缀-->
  <property name="suffix" value=".jsp"/>
</bean>
  <bean name="/hello.do" class="com.jsu.mvc.HelloController"></bean>

 //通过modelmap方式
  @RequestMapping("/modelmap")
  public String modelHello(String name,ModelMap map){
    map.addAttribute("name",name);
    System.out.println(name);

    return "index.jsp";
  }