Spring Cloud Gateway过滤器工厂GatewayFilterFactory初探

￡神魔★判官ぃ 2022-03-01 14:18 260阅读 0赞

## 1. 概述 ##

在[【spring cloud gateway】][spring cloud gateway]的官方文档中，是这样说明GatewayFilterFactory的：

> **Route filters allow the modification of the incoming HTTP request or outgoing HTTP response in some manner. Route filters are scoped to a particular route. Spring Cloud Gateway includes many built-in GatewayFilter Factories.**

*  路由过滤器允许以某种方式修改传入的HTTP请求或传出的HTTP响应；
 *  GatewayFilter不同于GlobalFilter，它只作用于指定的路由；
 *  spring cloud gateway中内置了大量的网关过滤器工厂；

## 2. 分类 ##

内置的过滤器工厂一共有22个，位于 `org.springframework.cloud.gateway.filter.factory`及`org.springframework.cloud.gateway.filter.factory.rewrite`包中

### 2.1 根据用途划分 ###

根据过滤器工厂的用途，可以划分为 `Header`、`Parameter`、`Path`、`Body`、`Status`、`Session`、`Redirect`、`Retry`、`RateLimiter`和`Hystrix`，具体如下：

*  **Header**
    
     *  `AddRequestHeaderGatewayFilterFactory`
     *  `RemoveRequestHeaderGatewayFilterFactory`
     *  `AddResponseHeaderGatewayFilterFactory`
     *  `RemoveResponseHeaderGatewayFilterFactory`
     *  `SetRequestHeaderGatewayFilterFactory`
     *  `SetResponseHeaderGatewayFilterFactory`
     *  `PreserveHostHeaderGatewayFilterFactory`
     *  `RequestHeaderToRequestUriGatewayFilterFactory`
     *  `SecureHeadersGatewayFilterFactory`
 *  **Parameter**
    
     *  `AddRequestParameterGatewayFilterFactory`
 *  **Path**
    
     *  `PrefixPathGatewayFilterFactory`
     *  `RewritePathGatewayFilterFactory`
     *  `SetPathGatewayFilterFactory`
     *  `StripPrefixGatewayFilterFactory`
 *  **Body**
    
     *  `ModifyRequestBodyGatewayFilterFactory`
     *  `ModifyResponseBodyGatewayFilterFactory`
 *  **Status**
    
     *  `SetStatusGatewayFilterFactory`
 *  **Session**
    
     *  `SaveSessionGatewayFilterFactory`
 *  **Redirect**
    
     *  `RedirectToGatewayFilterFactory`
 *  **Retry**
    
     *  `RetryGatewayFilterFactory`
 *  **RateLimiter**
    
     *  `RequestRateLimiterGatewayFilterFactory`
 *  **Hystrix**
    
     *  `HystrixGatewayFilterFactory`

### 2.2 根据作用域划分 ###

根据过滤器工厂的作用域划分，主要分为两类，一类是作用于 `request`，另一类是作用于 `response`，具体如下：

*  **Request**
    
     *  `AddRequestHeaderGatewayFilterFactory`
     *  `RemoveRequestHeaderGatewayFilterFactory`
     *  `SetRequestHeaderGatewayFilterFactory`
     *  `PreserveHostHeaderGatewayFilterFactory`
     *  `RequestHeaderToRequestUriGatewayFilterFactory`
     *  `AddRequestParameterGatewayFilterFactory`
     *  `PrefixPathGatewayFilterFactory`
     *  `RewritePathGatewayFilterFactory`
     *  `SetPathGatewayFilterFactory`
     *  `StripPrefixGatewayFilterFactory`
     *  `ModifyRequestBodyGatewayFilterFactory`
     *  `SaveSessionGatewayFilterFactory`
     *  `RequestRateLimiterGatewayFilterFactory`
     *  `HystrixGatewayFilterFactory`
 *  **Response**
    
     *  `AddResponseHeaderGatewayFilterFactory`
     *  `RemoveResponseHeaderGatewayFilterFactory`
     *  `SetResponseHeaderGatewayFilterFactory`
     *  `SecureHeadersGatewayFilterFactory`
     *  `ModifyResponseBodyGatewayFilterFactory`
     *  `SetStatusGatewayFilterFactory`
     *  `RedirectToGatewayFilterFactory`
     *  `RetryGatewayFilterFactory`

[spring cloud gateway]: http://cloud.spring.io/spring-cloud-gateway/single/spring-cloud-gateway.html#_gatewayfilter_factories