ModifyResponseBody 过滤器

您可以使用 ModifyResponseBody 过滤器，在响应体发送回客户端之前对其进行修改。

此过滤器只能通过 Java DSL 进行配置。

以下清单展示了如何修改响应体过滤器

GatewaySampleApplication.java
import static org.springframework.cloud.gateway.server.mvc.filter.AfterFilterFunctions.modifyResponseBody;
import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.uri;
import static org.springframework.cloud.gateway.server.mvc.handler.GatewayRouterFunctions.route;
import static org.springframework.cloud.gateway.server.mvc.handler.HandlerFunctions.http;

@Bean
public RouterFunction<ServerResponse> gatewayRouterFunctionsModifyResponseBodySimple() {
	return route("modify_response_body")
			.GET("/anything/modifyresponsebody", http())
            .before(uri("https://example.org"))
			.after(modifyResponseBody(String.class, String.class, null,
					(request, response, s) -> s.replace("fooval", "FOOVAL")))
			.build();
}

上面的示例没有改变内容类型，也没有进行任何动态操作。下面的示例改变了内容类型并动态地修改了内容。

GatewaySampleApplication.java
import static org.springframework.cloud.gateway.server.mvc.filter.AfterFilterFunctions.modifyResponseBody;
import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.uri;
import static org.springframework.cloud.gateway.server.mvc.handler.GatewayRouterFunctions.route;
import static org.springframework.cloud.gateway.server.mvc.handler.HandlerFunctions.http;
import static org.springframework.cloud.gateway.server.mvc.predicate.GatewayRequestPredicates.host;
import org.springframework.http.MediaType;

@Configuration
class RouteConfiguration {

    @Bean
    public RouterFunction<ServerResponse> gatewayRouterFunctionsModifyResponseBody() {
        return route("modify_response_bodu")
            .route(host("*.modifyresponsebodu.org"), http())
            .before(uri("https://example.org"))
            .after(modifyResponseBody(String.class, String.class, MediaType.APPLICATION_JSON_VALUE,
                    (request, s) -> s.toUpperCase()))
            .build();
    }

}