SpringMVC 转发 重定向【vaynexiao】

1.通过ModuleAndView实现转发和重定向

设置ModelAndView对象 , 根据view的名称 , 和视图解析器跳到指定的页面 .
页面 : {视图解析器前缀} + viewName +{视图解析器后缀}

<!-- 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>

public class ControllerTest1 implements Controller {
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        //返回一个模型视图对象
        ModelAndView mv = new ModelAndView();
        mv.addObject("msg","ControllerTest1");
        mv.setViewName("test");
        return mv;
    }
}

2.通过ServletAPI实现转发和重定向

不需要视图解析器：
1.通过HttpServletResponse进行输出
2.通过HttpServletResponse实现重定向
3.通过HttpServletRequest实现转发

@Controller
public class ModelAndViewTest {

   @RequestMapping("/result/t1")
    public void test1(HttpServletRequest req, HttpServletResponse rsp)throws IOException,IOException {
        rsp.getWriter().println("Hello,Spring BY servlet API");
    }

    @RequestMapping("/result/t2")
    public void test2(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
       rsp.sendRedirect("/index.jsp");
    }

    @RequestMapping("/result/t3")
    public void test3(HttpServletRequest req, HttpServletResponse rsp) throws Exception {
        req.setAttribute("msg","/result/t3");
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,rsp);
    }
}

3.通过Springmvc实现转发和重定向

springmvc.xml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
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--自动扫描包，让指定包下面的注解生效，由IOC容器同一管理-->
    <context:component-scan base-package="com.hh.controller"/>

    <!--让Springmvc不处理静态资源-->
    <mvc:default-servlet-handler/>

    <!--支持springmvc注解驱动-->
    <mvc:annotation-driven/>
</beans>

@Controller
public class ModelTest1 {
    @RequestMapping("/m1/t1")
    public String test(Model model){
        model.addAttribute("msg","modelTest1");
        //转发 请求前后，地址栏没有改变，转发跳转
        return "forward:/WEB-INF/jsp/test.jsp";
        //重定向 地址改变，重定向跳转
        //设置重定向不能写逻辑视图，必须写明目标资源的物理路径，如"redirect:/index.jsp"。
        return "redirect:/index.jsp";
    }
}