Alternative of @ModelAttribute annotation in Spring

Question

Like in Spring we have httpServeletRequest.getParameter("key") as an alternative to @RequestParam("key"), do we have any alternative to @ModelAttribute("key") ?

model.addAttribute("student",new Student()); ... ... @RequestMapping("/processStudentForm") public String processTheForm( @ModelAttribute("student") Student student ) { ... }

Do we have something like?

public String processTheForm( Model model ) { Student student = model.getAtribute("key"); ... }

Update 1

 @RequestMapping("/showStudentForm") public String showTheForm(Model model) { model.addAttribute("key",new Student()); return "studentForm"; }

<form:form action='processStudentForm' modelAttribute='key' method='post'> ... </form:form>

I am binding the form values into student object. How to access this model attribute through request object??

There is @RequestBody annotation in spring-boot

MangduYogii
– MangduYogii

2019-08-21 13:07:32 +00:00
Commented Aug 21, 2019 at 13:07 — MangduYogii
– MangduYogii, Commented Aug 21, 2019 at 13:07

Manoj Krishna · Accepted Answer · 2019-08-21 12:48:03Z

The student Model Object cannot be accessed directly though the request object but you can access this in different ways from the request object .By Default spring does lot of work under the hood its uses FormHttpMessageConverter to convert it to a model map on a application/x-www-form-urlencoded request you can refer the docs.

https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/http/converter/FormHttpMessageConverter.html

You can do the same what spring does internally.I tried this its working but you can do it in multiple ways refer the stack overflow post for other answers

 Map map = httpServletRequest.getParameterMap().entrySet() .stream().collect(Collectors.toMap(e -> e.getKey(), e -> Arrays.stream(e.getValue()).findFirst().get())); Student student = new ObjectMapper().convertValue(map, Student.class);

Getting request payload from POST request in Java servlet

But its always a good practice to use the default implementation.

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