SpringMVC框架学习笔记（4）——结果跳转方式

1.设置ModelAndView对象。根据View和视图解析器跳转到指定页面（视图解析器前缀+viewname+视图解析器后缀）

@Override
public ModelAndView handleRequest(HttpServletRequest req,
        HttpServletResponse resp) throws Exception {
    ModelAndView mv = new ModelAndView();
    mv.setViewName("hello");
    mv.addObject("msg", "first spring mvc app");
    return mv;
}

2.通过ServletAPI对象来实现，不需要配置视图解析器

通过HttpServletRequest输出

resp.getWriter().print("Use httpServletAPI");

通过HttpServletRequest实现重定向

@RequestMapping(value = "/hi.do")
public void hello(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
    resp.sendRedirect("hello.jsp");
}

通过HttpServletRequest实现转发

@RequestMapping(value = "/hi.do")
public void hello(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
    req.setAttribute("msg", "testRequestDispatcher");
    req.getRequestDispatcher("hello.jsp").forward(req, resp);
}

3.通过springMVC来实现重定向和转发

转发

@RequestMapping("/hi2")
public String hello2() {
    //转发1
    //return "index";
    //转发2
    return "forward:index.jsp";
}

重定向

@RequestMapping("/hi3.do")
public String hello3(ModelMap map) {
    map.addAttribute("msg", "helloworld");
    return "redirect:index.jsp";
}