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？
    }
}

4.配置tomcat并测试