SpringMVC请求转发和重定向测试

保存视图解析器的请求转发和重定向测试

1.web.xml模板文件（略）

2.springmvc配置文件

<?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:mvc="http://www.springframework.org/schema/mvc"

       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.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--    自动扫描包，让指定包下的注解生效，有IOC容器统一管理-->

    <context:component-scan base-package="com.lian.controller"/>

    <mvc:default-servlet-handler/>

    <mvc:annotation-driven/>

    <!--    视图解析器-->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"

          id="internalResourceViewResolver">

        <!--        前缀-->

        <property name="prefix" value="/WEB-INF/jsp/"/>

        <!--        后缀-->

        <property name="suffix" value=".jsp"/>

    </bean>

</beans>

3.Controller类

请求转发需要全限定路径，同时要注意重定向不能访问到WEB-INF文件下的资源

@Controller

public class ResultGo {

    @RequestMapping("/result/t1")

    public void test1(HttpServletRequest req, HttpServletResponse resp) throws IOException {

        resp.getWriter().println("Hello,Spring by servlet API!");

    }

    @RequestMapping("/result/t2")

    public void test2(HttpServletRequest req,HttpServletResponse resp) throws IOException {

       //重定向

        resp.sendRedirect("/index.jsp");

    }

    @RequestMapping("/result/t3")

    public void test3(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException {

        //请求转发

        req.setAttribute("msg","/result/t3");

        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);

    }

}

不保存视图的请求转发和重定向测试

@Controller

public class ResultGo2 {

    @RequestMapping("/rsm/t1")

    public String test1(){

        //请求转发方式一

        return "/index.jsp";

    }

    @RequestMapping("/rsm/t2")

    public  String test2(Model model){

        //请求转发方式二

        model.addAttribute("msg","test2请求转发");

        return "forward:/WEB-INF/jsp/test.jsp";

    }

    @RequestMapping("/rsm/t3")

    public  String test3(Model model){

        model.addAttribute("msg","test3redirect");

        //重定向

        return "redirect:/index.jsp";//这里重定向转不过去/WEB-INF/jsp/test.jsp，，重定向访问不到WEB-INF下的资源，访问WEB-INF/jsp/test.jsp只能通过转发的方式咯？

    }

}