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SpringCloud Webflux过滤器增加header传递方式

发布：2023-04-03 10:05:02 59

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SpringCloud Webflux过滤器增加header传递

Webflux过滤器增加header传递

webflux 使用异步非阻塞的方式，传递Header还需要我们自己增加代码传递：

定义过滤器，便携下面的配置可以尝试一下header的传递到后面的服务中。

@Component
public class AuthorizationFilter implements WebFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
        ServerHttpRequest mutatedRequest = exchange.getRequest().mutate().header(HttpHeaders.AUTHORIZATION, "Bearer " + authHeader).build();
        ServerWebExchange mutatedExchange = exchange.mutate().request(mutatedRequest).build();
        return chain.filter(mutatedExchange);
    }
}
 
 
## Kotlin 的方式
@Component
class AuthorizationFilter : WebFilter {
    override fun filter(exchange: ServerWebExchange, chain: WebFilterChain): Mono<Void> {
        val mutatedRequest = exchange.request.mutate().header(HttpHeaders.AUTHORIZATION, "Bearer $authHeader").build()
        val mutatedExchange = exchange.mutate().request(mutatedRequest).build()
        return chain.filter(mutatedExchange)
    }
}

Webflux过滤器使用

下面是简单处理token的例子

@Component
@Order(value = 2)
public class AuthFilter implements WebFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
        ServerHttpRequest request =  exchange.getRequest();
        //ServerHttpResponse response =  exchange.getResponse();

        String token = request.getHeaders().getFirst("token");
        if(null == token){
                /*http头中没有appKey，修改请求的目标url为/auth/error
                  request.mutate返回一个请求构建器(builder design pattern)，path方法修改请求的url，build方法返回新的request
               */
            ServerHttpRequest authErrorReq = request.mutate().path("/auth/error").build();
            //erverWebExchange.mutate类似，构建一个新的ServerWebExchange
            ServerWebExchange authErrorExchange = exchange.mutate().request(authErrorReq).build();
            return chain.filter(authErrorExchange);
        } else{ 
            return chain.filter(exchange);
        }
    }
}

webFlux将指定的错误信息通过json格式返回给前端

exchange.getResponse().writeWith(Flux.just(exchange.getResponse().bufferFactory().wrap(JsonUtil.toJson(new BaseErrorVO().fail(e.getMessageCode(),e.getSystemMessage())).getBytes())));