Compare and contrast the usage differences between @RequestParam and @PathVariable

In spring MVC, the function of both is to bind the value of the parameter in the request to the method parameter in the contorl. The difference is that the URL is written differently.

When using @RequestParam, the URL is like this: http://host:port/path?Parameter name = parameter value

When using @PathVariable, the URL is like this: http://host:port/path/Parameter value

For example:

[java] view plain copy

1. @RequestMapping(value="/user",method = RequestMethod.GET)

2. ##public @ResponseBody

# User printUser(
3. @RequestParam( value =

   "id", required = false, defaultValue = "0")

##int id) {

4. # User user =

   new User();

5. ## user = userService .getUserById(id);

6. #@RequestMapping(value=

   "/user/{id:\\d+}",method = RequestMethod.GET)
public
8. @ResponseBody

9. ## User printUser2(

   @PathVariable
int id) {

10. ## User user = new User();

11. user = userService.getUserById(id);

return user;
13. The access paths for the above two methods are as follows:

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