public JsonResult add(@RequestBody(required = false) User user){
if(user == null){
// RequestBody ;
// ;
}
}
public JsonResult add(@RequestBody(required = false) User user){
if(user == null){
// RequestBody ;
// ;
}
}use @ ControllerAdvice for uniform exception handling
Spring provides its own parameter verification mechanism
validation class
public class UserValidator implements Validator {
@Override
public boolean supports(Class<?> aClass) {
return aClass.equals(User.class);
}
@Override
public void validate(Object o, Errors errors) {
if (o == null) {
errors.rejectValue("", null, "");
}
}
}UserController
public class UserController {
/**
* @Valid
*/
@InitBinder
public void initBinder(WebDataBinder binder) {
//
binder.setValidator(new UserValidator());
}
public JsonResult add(@Valid @RequestBody User user, Errors errors) {
if (errors.hasErrors()) {
//
}
//balabala
}
}just search for the specific usage
Previous: The first screen of react project flashes after build.
Next: Javascript can print out objects, but sub-objects can't get them.