controller类的主要代码
@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/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/contexthttp://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.sawshaw.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1return "home.jsp";//转发方式2return "forward:index.jsp";//重定向方式return "redirect:index.jsp";}

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

public class HelloController implements Controller {@Overridepublic 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";}