Spring Cloud Spring Boot mybatis distributed micro-service Cloud architecture returns JSON format

In the example above, @ControllerAdvice mapping to different error handling pages by unifying the different exception is defined. And when we want to implement the RESTful API, the error returned is JSON-formatted data, not HTML pages, which we can easily support.

Essentially, @ExceptionHandler @ResponseBody you can convert the contents of the return of the handler function into JSON format simply by adding it later.

The following is a concrete example to implement exception handling that returns JSON format.

• Create a unified JSON return object, code: Message type, message: Content, URL: Requested url,data: Request returned data

 Public classErrorinfo<t> {         Public Static FinalInteger OK = 0;  Public Static FinalInteger ERROR = 100; PrivateInteger Code; PrivateString message; PrivateString URL; PrivateT data; //omit getter and setter  }  

Create a custom exception to experiment with catching the exception and return the JSON

 Public class extends Exception {        public  myexception (String message) {          Super(message);      }        }  

ControllerAdd JSON mappings, throw MyException exceptions

@Controller    Public class Hellocontroller {        @RequestMapping ("/json")      publicthrows  myexception {          thrownew myexception ("Error 2 occurred");      }    }  

MyExceptioncreate a corresponding processing for an exception

@ControllerAdvice Public classGlobalexceptionhandler {@ExceptionHandler (value= MyException.class) @ResponseBody PublicErrorinfo<string> Jsonerrorhandler (httpservletrequest req, myexception e)throwsException {errorinfo<String> r =NewErrorinfo<>();          R.setmessage (E.getmessage ());          R.setcode (Errorinfo.error); R.setdata ("Some Data");          R.seturl (Req.getrequesturl (). toString ()); returnR; }    }  

Launch app, Access: Http://localhost:8080/json, you can get the following return content:

{      "Some Data",      "error 2"      , "Http://localhost:8080/json"         }  

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Spring Cloud Spring Boot mybatis distributed micro-service Cloud architecture returns JSON format