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在WebFlux中自定义异常响应


需求:出现意外报错响应内容可读性差,不利于排查与定位,需要自定义错误响应。

在web中可以使用@ControllerAdvice即可编写统一异常响应,在webFlux下则是另一种编写方式。

Component
@Order(-2) //这里将全局错误处理程序的顺序设置为-2。这是为了让它比 @Order(-1) 注册的 DefaultErrorWebExceptionHandler 处理程序更高的优先级。
@Slf4j
public class ExceptionHandler implements ErrorWebExceptionHandler {
    @SneakyThrows
    @Override
    public Mono<Void> handle(ServerWebExchange serverWebExchange, Throwable throwable) {
        ServerHttpResponse response = serverWebExchange.getResponse();
        response.setStatusCode(HttpStatus.OK);
        Dson dson = new Dson();
        String message = throwable.getMessage();
        dson.put("错误信息:", message);
        String methodValue = serverWebExchange.getRequest().getMethodValue();
        dson.put("请求方式:", methodValue);
        return serverWebExchange.getRequest().getBody()
                .collectList()
                .flatMap(list -> {
                    log.info("list:{}", list);
                    StringBuffer str = new StringBuffer();
                    for (DataBuffer buf : list) {
                        byte[] bytes = new byte[buf.readableByteCount()];
                        buf.read(bytes);
                        str.append(new String(bytes));
                    }
                    dson.put("消息体:", str.toString());
                    response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
                    DataBuffer buff = response.bufferFactory().wrap(dson._Value().toString().getBytes());//非池化内存
                    return response.writeWith(Mono.just(buff));
                });

    }
}

效果演示

请求方式:post  
请求地址:localhost:11000/error
请求体:
{
	"账号":"152xxxxxxx",
	"token":"356434371b1a7a984d37a1f4f3054c8b",
}

请求方法:

    @RequestMapping("/error")
    public Object getError(String Str) {
        return 1/0;
    }

原生错误响应:


{
    "timestamp": 1598952492292,
    "path": "/error",
    "status": 500,
    "error": "Internal Server Error",
    "message": "/ by zero",
    "requestId": "af25e175-1"
}

自定义错误响应:


{
    "错误信息:": "/ by zero",
    "请求方式:": "POST",
    "消息体:": {
        "账号": "152xxxxxxxx",
        "token": "356434371b1a7a984d37a1f4f3054c8b"
    }
}

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