SpringMVC 返回值分类-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_43196090/article/details/108477380

文章目录

项目目录结构

在这里插入图片描述

1.String

index.jsp

<a href="resp/testString">testString</a><br>

@RequestMapping("/testString")
    public String testString(){
        System.out.println("testString");
        return "success";
        // 下面两个并不通过视图解析器
        // 我的success.jsp是直接放在webapp目录下的所以看起来两个目录相同
        // 其实若将success.jsp放在xx目录下,forward:/xx/success.jsp,
        // 而redirect路径不会发生变化
        //return "forward:/success.jsp";
        //return "redirect:/success.jsp";
    }

2.void

index.jsp

<a href="resp/testVoid">testVoid</a><br>

 @RequestMapping("/testVoid")
    public void testVoid(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("testVoid");
        // 使用请求转发跳转
//        request.getRequestDispatcher("/success.jsp").forward(request, response);
        // 使用重定向跳转
        response.sendRedirect(request.getContextPath()+"/success.jsp");

        // 直接响应数据
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html; charset=UTF-8");
        response.getWriter().write("测试");
    }

3.ModelAndView

success.jsp
注意mav.addObject的值存在request域中

<body>
    <h3>success</h3>
    ${requestScope.temp}
</body>

index.jsp

<a href="resp/testModelAndView">testModelAndView</a><br>

@RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView(){
        System.out.println("testModelAndView");
        ModelAndView mav = new ModelAndView();
        // 走视图解析器
        mav.setViewName("success");
        mav.addObject("temp","xxx");
        return mav;
    }