springMVC 几种页面跳转方式

1.在注解的方式中

1.1通过HttpServletResponse的API直接输出（不需要配置渲染器）

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");



    }

web.xml配置

<?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>

dispatcher-servlet.xml主要代码

<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>

1.2 使用HttpServletResponse 重定向到另一个视图(其他不变 )

 @RequestMapping("/resp")

    public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {


        resp.sendRedirect("index.jsp");


    }

}

1.3 使用HttpServletRequest 转发（默认访问/下的index.jsp页面 不受渲染器的影响）

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

        req.setAttribute("message","it's forword ");

        req.getRequestDispatcher("index.jsp").forward(req,resp);

        }

1.4直接返回jsp页面的名称（无渲染器）

其他的配置不变

 @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";

    }

1.5当有渲染器指定

@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";

    }

2 使用view

2.1 使用modelandview

需要视图解析器 能指定跳转页面

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;


    }

}

[servlet-name]-servlet.xml

<!--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>

2.2 使用modelview

不需要视图解析器 不能指定跳转页面

  //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";

    }