How to write code for global exception handling in Spring Boot?

2 years ago
Isabella Edwards
2 minutes

In Spring Boot, you can handle all exceptions in your application by creating a global exception handler. Here is an example code demonstrating how to implement a global exception handling mechanism.

Firstly, create a custom exception handler class and implement the @ControllerAdvice and @ExceptionHandler annotations, so that Spring Boot will recognize it as a global exception handler.

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public ResponseEntity<String> handleException(Exception e) {
        // 在这里编写异常处理逻辑
        // 可以根据具体的异常类型进行不同的处理
        // 返回自定义的错误消息或错误码
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Internal Server Error");
    }
}

In the handleException method, different handling logics can be implemented based on specific exception types, and custom error messages or error codes can be returned.

Next, in the main class of Spring Boot, add the @EnableWebMvc annotation to enable global exception handling.

@SpringBootApplication
@EnableWebMvc
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

In this way, any exceptions thrown in the application will be caught and handled by the global exception handler.

It’s important to note that the global exception handler can only handle exceptions thrown in the Controller layer. If exceptions are thrown in the Service layer or elsewhere and require handling, you can use a try-catch block in the corresponding method to handle the exceptions and return a custom error message or error code.

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