Spring Cloud的全局異常處理

//全局異常處理類
@Configuration
public class GlobalExceptionConfiguration implements ErrorWebExceptionHandler {
    //日志對象
    private static final Logger log = LoggerFactory.getLogger(GlobalExceptionConfiguration.class);

    private static final ObjectMapper objectMapper = new ObjectMapper();

    @Override //參數1: request response   ex:出現異常時異常對象
    public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
        Map<String, String> result = new HashMap<>();

        //1.獲取響應對象
        ServerHttpResponse response = exchange.getResponse();

        //2.response是否結束  多個異常處理時候
        if (response.isCommitted()) {
            return Mono.error(ex);
        }

        //2.設置響應頭類型
        response.getHeaders().setContentType(MediaType.APPLICATION_JSON);

        //3.設置響應狀態嗎
        if (ex instanceof IllegalTokenException) {
            response.setStatusCode(HttpStatus.FORBIDDEN);
        } else {
            response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
        }
        //4.設置響應內容
        return response
                .writeWith(Mono.fromSupplier(() -> {
                    DataBufferFactory bufferFactory = response.bufferFactory();
                    result.put("msg", ex.getMessage());
                    try {
                        return bufferFactory.wrap(objectMapper.writeValueAsBytes(result));
                    } catch (JsonProcessingException e) {
                        e.printStackTrace();
                        return null;
                    }
                }));
    }
}