Controllers with Forms ====================== Sending Form Data - Video ------------------------- .. youtube:: :video_id: LQxzrKPnUGY .. admonition:: Note The starter code for this video is found in the `path-variables branch `__ of the ``hello-spring-demo`` repo. The final code presented in this video is found on the `forms branch `__. As always, code along to the videos on your own ``hello-spring`` project. Sending Form Data - Text ------------------------- What if we want to send over some form data? To send data via a simple form in Spring Boot, we'll set things up like this: We have a controller method that generates a form at index. .. sourcecode:: java @GetMapping @ResponseBody public String helloForm() { String html = "" + "" + "" + "" + ""; return html; } Remember, without an argument, ``@GetMapping`` maps to ``/``. On form submission, the data is sent to another path, ``/hello``. We need a controller for that. .. sourcecode:: java @GetMapping("hello") @ResponseBody public String hello(@RequestParam String coder) { return "Hello, " + coder + "!"; } Now, you have a controller that can handle the form submission. When the form submits, the input entered in the text box will be passed to the URL via a query string. This is why the controller method above passes in ``@RequestParam`` to handle the ``coder`` key. To be able to submit the form via ``POST``, we'll need to modify the ``hello()`` controller to use ``@RequestMapping``. Remember, ``@RequestMapping`` can annotate a method that responds to both ``GET`` and ``POST``. .. sourcecode:: java // Responds to get and post requests at /hello?coder=LaunchCoder @RequestMapping(value = "hello", method = {RequestMethod.GET, RequestMethod.POST}) @ResponseBody public String hello(@RequestParam String coder) { return "Hello, " + coder + "!"; } @GetMapping @ResponseBody public String helloForm() { String html = "" + "" + "" + "" + ""; return html; } Check Your Understanding ------------------------ .. admonition:: Question From the list below, which annotations are applied above a controller class. a. ``@Controller`` b. ``@GetMapping`` c. ``@PostMapping`` d. ``@RequestMapping`` e. ``@ResponseBody`` f. ``@RequestParam`` g. ``@PathVariable`` .. ans: a, d, + e, controller, requestmapping, and responsebody .. admonition:: Question From the list below, which annotations are applied above a controller method. a. ``@Controller`` b. ``@GetMapping`` c. ``@PostMapping`` d. ``@RequestMapping`` e. ``@ResponseBody`` f. ``@RequestParam`` g. ``@PathVariable`` .. ans: b, c, d, + e, getmapping, postmapping, requestmapping, and responsebody