Spring or Springboot Unified exception handling

Spring or Springboot Unified exception handling
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One, this article describes the custom exception handling of spring MVC, where the client receives a hint of a more friendly JSON format when throwing out a defined exception in the controller. Rather than the usual error page.

Second, the scene description: Implement the public API, verify the logic of the API key, put in the interceptor to judge (equivalent to in the controller) and throw an exception, the user received a similar prompt:

The HTTP status code can also be controlled freely.

Three, Solution:

1, throw an exception in the Ratelimitinterceptor.java Interceptor:

[Java] View plain copy

2. Public class Ratelimitinterceptor extends handlerinterceptoradapter{
6. @Autowired private Redisservice rs;
10. /** 
12. * Flow Control Check Entry
14. */
16. @Override
18. Public Boolean prehandle (httpservletrequest request,
20. HttpServletResponse response, Object handler) throws Requiredparameterexception, Signexception, ratelimitexception,exception {
22. Super.prehandle (Request, response, handler);
24. String AppKey = Request.getparameter ("AppKey");
26. //Determine if the Appkey is empty or legal
28. if (AppKey = = null) {
30. throw New Requiredparameterexception ("");
32. }Else if (appkeyutils.isformatcorrect (AppKey) | |!rs.isexist (appKey)) {
36. throw new Signexception ();
40. }Else {
42. try {
44. Appcall Appcall = appcall.create (AppKey, Appkeyutils.getplandetails (AppKey));
46. Appcall.decrease ();
48. Rs.save (Appcall);
50. System.out.println ("Ratelimitinterceptor pass.");
52. } catch (Ratelimitexception e) {
54. //Throw overrun exception
56. throw new Ratelimitexception ();
58. }
60. }
62. return true;
64. }
68. }

Spring or Springboot Unified exception handling