SpringBoot: Implementation example of unified exception handling

1. Concept

In fact, unified exceptions use AOP (centralized processing of a certain type of thing). A simple summary is that when we interact with front and back end data, any exceptions thrown can be automatically caught and thrown, and programmers do not need to pay special attention to try catch statements when typing code.

In fact, unified exception handling is very simple. When implementing, you need to add class annotation @ControllerAdvice (this is an annotation representing control notifications, and it will also be used in the next unified exception handling). And one thing is different from unified data return, unified exception handling requires class annotation @ResponseBody to confirm the returned data type, and then add annotation @ExceptionHandle to the method to capture exceptions in the class.

2. Global exception handling

The code for handling global exceptions is as follows:

import ;
import ;
import ;
import ;


 
@ControllerAdvice
@ResponseBody

public class ErrorAdvice {

	/**
	  * Global exception handling
	  */
	@ExceptionHandler
	public Object handler(Exception e) {
		return (());
	}
	
}

In this way, when the program throws an exception, it will be caught by the exception handling method and return the result of unified exception handling (JSON format)!

3. Handle specific exceptions

The code for handling specific exceptions is as follows:

import ;
import ;
import ;
import ;

@ResponseBody
@ControllerAdvice

public class ErrorAdvice {

	@ExceptionHandler
	public Object handler(Exception e) {
		return (());
	}

	@ExceptionHandler
	public Object handler(NullPointerException e) {
		return ("NullPointerException occurs:"+());
	}

	@ExceptionHandler
	public Object handler(ArithmeticException e) {
		return ("ArithmeticException occurs:"+());
	}

}

When there are multiple exception notifications, the matching order is the current class and its subclasses match upwards in turn.

The purpose of unified exception handling is to minimize damage when an exception occurs and handle it properly without affecting the operation of other programs.

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