1 Introduction
MVC project, to provide a friendly user experience, as far as possible a comprehensive system logging, Controller usually capture business level exceptions, returns an error message to avoid unfriendly. Thus, the Controller each method is to use the template of the try-catch, process all exceptions, but results in poor maintenance codes unsightly. as follows:
try {
......
} catch (Exception e) {
......
} finally {
......
}
@ControllerAdvice + @ExceptionHandler can use unified treatment Controller layer anomalies, avoid using the template of the try-catch, reducing these unnecessary code maintenance.
2. Define the global exception handler class
{Private static class GlobalExceptionHandler @ControllerAdvicepublic Logger Logger = LoggerFactory.getLogger (GlobalExceptionHandler.class);
/ *
* String to return data or data json: you need to annotate the method: add a return to @ResponseBody.
* Back view: a ModelAndView to define, and then return;
* define the view file (for example: error.html, error.ftl, the error.jsp);
* /
@ExceptionHandler (Exception.class)
@ResponseBody public from exceptionHandler the Result <?> (Exception E) {
String e.toString MSG = ();
logger.error (MSG, E); return (<?> the Result) Result.toFail (MSG);
}
}
Note: GlobalExceptionHandler should be included in the Application initiate a scan path in order to be loaded using incorrect.
3. deficiencies at
Controller can only handle exceptions thrown for Interceptor (Interceptor) and other abnormal levels, do nothing.
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