Springmvc:(四) 结果跳转方式

一、ModelAndView

  1. 视图解析器

    <!-- 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>
    

    controller

    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;
        }
    }
    

二、ServletAPI

导入依赖
<dependency>
 <groupId>javax.servlet</groupId>
 <artifactId>javax.servlet-api</artifactId>
 <version>4.0.1</version>
</dependency>

通过设置ServletAPI,不需要设置视图解析器

  1. 通过HttpServletResponse进行输出,重定向,转发
@Controller
public class ResultGo {

    @RequestMapping("/result/t1")
    public void test1(HttpServletRequest req, HttpServletResponse rsp) throws 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 {
        //转发
        req.setAttribute("msg","/result/t3");
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,rsp);
    }

}

三、springmvc

通过springmvc来实现转发和重定向,

  • 无需视图解析器
@Controller
public class ResultSpringMVC {
    @RequestMapping("/rsm/t1")
    public String test1(){
        //转发
        return "/index.jsp";
    }

    @RequestMapping("/rsm/t2")
    public String test2(){
        //转发二
        return "forward:/index.jsp";
    }

    @RequestMapping("/rsm/t3")
    public String test3(){
        //重定向
        return "redirect:/index.jsp";
    }
}
  • 有视图解析器

    @Controller
    public class ResultSpringMVC2 {
        @RequestMapping("/rsm2/t1")
        public String test1(){
            //转发
            return "test";
        }
    
        @RequestMapping("/rsm2/t2")
        public String test2(){
            //重定向
            return "redirect:/index.jsp";
            //return "redirect:hello.do"; //hello.do为另一个请求/
        }
    
    }
    
posted @ 2020-03-13 12:18  梦想与爱  阅读(152)  评论(0编辑  收藏  举报