As we all know, the controller is only used to receive the client's request.
Annotations for handling controller and url mapping:
@Controller handles http requests;
@RestController This is a new annotation added after Spring 4. It is recommended to use this annotation. The above @Controller is not used, because it also needs @ResponseBody to cooperate with @Controller to return json;
@RequestMapping configures url mapping;
Access is successful:
Access is successful:
In order to be safe and in line with business scenarios, the post/get method still needs to be added. The post method cannot be accessed in the browser. Postman can be used to send requests:
Annotations for handling url parameters:
@PathVariable get data in url
@RequestParam gets the value of the request parameter
@GetMapping composition annotation
ps: This annotation can be used to receive parameters regardless of the post/get method.
Access is successful:
Other properties of @RequestParam:
@GetMapping or @PostMapping, simplified annotation:
