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";
}