springMVC重定向

springMVC重定向是一个controller方法跳转到另外一个controller方法，是用forward和redirect关键字在controller层进行处理。

session传值

public String save(@RequestParam(value="name", required=false ) String name, HttpServletRequest request,Model model){
    //常规做法，重定向之前把参数放进Session中，在重定向之后的controller中把参数从Session中取出并放进ModelAndView
    request.getSession().setAttribute("name", name);
    return "redirect:/main";
}
​
public String main(Model model,HttpServletRequest request){
    //从session中取值
    HttpSession session = request.getSession();
    model.addAttribute("name",session.getAttribute("name"));
    return "main";
}

RedirectAttributes传值

public String save(@RequestParam(value="name", required=false ) String name, HttpServletRequest request,RedirectAttributes redirectAttributes){
    //把值放入RedirectAttributes
    redirectAttributes.addFlashAttribute("name", name);
    return "forward:/main";
}
​
//直接取值
public String main(@RequestParam("name") String name){
    System.out.println("name : "+name);
    return "main";
}

3.URL中拼接参数

public String save(@RequestParam(value="name", required=false ) String name, HttpServletRequest request,RedirectAttributes redirectAttributes){
    //把值放入RedirectAttributes
    return "redirect:/main?name="+name;
}
​
//直接取值
public String main(@RequestParam("name") String name){
    System.out.println("name : "+name);
    return "main";
}