• 通過實體 Bean 接收請求參數

@RequestMapping("/login")
public String login(User user, Model model) {
    if ("bianchengbang".equals(user.getName())
            && "123456".equals(user.getPwd())) {
       
        model.addAttribute("message", "登錄成功");
        return "main"; // 登錄成功，跳轉到 main.jsp
    } else {
        model.addAttribute("message", "用戶名或密碼錯誤");
        return "login";
    }

• 通過處理方法的形參接收請求參數

@RequestMapping("/login")
public String login(String name, String pwd, Model model) {
    if ("bianchengbang".equals(user.getName())
            && "123456".equals(user.getPwd())) {
       
        model.addAttribute("message", "登錄成功");
        return "main"; // 登錄成功，跳轉到 main.jsp
    } else {
        model.addAttribute("message", "用戶名或密碼錯誤");
        return "login";
    }
}

• 通過 HttpServletRequest 接收請求參數?

@RequestMapping("/login")
public String login(HttpServletRequest request, Model model) {
    String name = request.getParameter("name");
    String pwd = request.getParameter("pwd");
   
    if ("bianchengbang".equals(name)
            && "123456".equals(pwd)) {
       
        model.addAttribute("message", "登錄成功");
        return "main"; // 登錄成功，跳轉到 main.jsp
    } else {
        model.addAttribute("message", "用戶名或密碼錯誤");
        return "login";
    }
}

• 通過 @PathVariable 接收 URL 中的請求參數

@RequestMapping("/login/{name}/{pwd}")
public String login(@PathVariable String name, @PathVariable String pwd, Model model) {
   
    if ("bianchengbang".equals(name)
            && "123456".equals(pwd)) {
       
        model.addAttribute("message", "登錄成功");
        return "main"; // 登錄成功，跳轉到 main.jsp
    } else {
        model.addAttribute("message", "用戶名或密碼錯誤");
        return "login";
    }
}

• 通過 @RequestParam 接收請求參數?

@RequestMapping("/login")
public String login(@RequestParam String name, @RequestParam String pwd, Model model) {
   
    if ("bianchengbang".equals(name)
            && "123456".equals(pwd)) {
       
        model.addAttribute("message", "登錄成功");
        return "main"; // 登錄成功，跳轉到 main.jsp
    } else {
        model.addAttribute("message", "用戶名或密碼錯誤");
        return "login";
    }
}

• 通過 @ModelAttribute 接收請求參數?

@RequstMapping("/login")
public String login(@ModelAtrribute("user") User user,Model model){
id("bb".equals(name)&& "1234".equals(pwd)){
  model.addAttribute("message"," 登陸成功");
  return"main";
}  else{
model.addAtrribute("message","錯誤");
return "login";
}
}