我想知道Spring Cloud Gateway中是否有网关过滤器（全局或非全局）的推荐顺序范围，因为网关链中存在订单小于1且大于9999的Spring Gateway过滤器。请参阅：
{OrderedGatewayFilter@20770} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.RemoveCachedBodyFilter@5eb974}, order = -2147483648]"
{OrderedGatewayFilter@20771} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.AdaptCachedBodyGlobalFilter@ae5eeee}, order = -2147482648]"
{OrderedGatewayFilter@20772} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.NettyWriteResponseFilter@492c1b1b}, order = -1]"
{OrderedGatewayFilter@20774} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.ForwardPathFilter@3927de0e}, order = 0]"
{OrderedGatewayFilter@20775} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.GatewayMetricsFilter@36dab184}, order = 0]"
// my custom filters should be here
{OrderedGatewayFilter@20791} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.RouteToRequestUrlFilter@72f112d1}, order = 10000]"
{OrderedGatewayFilter@20792} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.config.GatewayNoLoadBalancerClientAutoConfiguration$NoLoadBalancerClientFilter@71b9b035}, order = 10150]"
{OrderedGatewayFilter@20793} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.WebsocketRoutingFilter@4c475547}, order = 2147483646]"
{OrderedGatewayFilter@20794} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.NettyRoutingFilter@189f5ed8}, order = 2147483647]"
{OrderedGatewayFilter@20795} "[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.ForwardRoutingFilter@10faebc9}, order = 2147483647]"
我的自定义全局过滤器实现了有序接口：
@Component
public class GlobalFilter implements GlobalFilter, Ordered {
@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) { ... }
@Override
public int getOrder() {
return 2; // here
}
}
我的网关过滤器是OrderedGatewayFilter：
@Component
public class CustomFilter implements GatewayFilterFactory<CustomFilter.Config> {
@Override
public GatewayFilter apply(Config config) {
return new OrderedGatewayFilter((exchange, chain) -> {
...
}, 3); // here
}
...
}
我的过滤器应该在1…9999范围内吗？或者将我的自定义过滤器放在这些Spring Cloud Gateway过滤器之前或之后没有问题吗？
筛选链按照org. springframe.core.Or的接口排序。根据Spring Framework留档上的注解类型顺序：
缺省值为有序。LOWEST_PRECEDENCE，表示最低优先级（丢失到任何其他指定的顺序值）。
但是
较低的值具有较高的优先级。
如果在IDE中检查，则可能的最低值（优先级最高）为-2147483648。可能的最高值为2147483647。
从全局过滤器的留档和一些经验来看，-1是一个起点，你可以安排你需要的顺序。或者，如果你有一个过滤器总是需要先执行，请使用有序。HIGHEST_PRECEDENCE并从那里订购其他过滤器，如有序。HIGHEST_PRECEDENCE1等。
编辑：Spring Cloud Gateway内部有一些硬编码的Filter Orders，例如NettyWriteResponse seFilter中的"WRITE_RESPONSE_FILTER_ORDER=-1"。如果您担心干扰，请检查源代码进行排序。
