@Component
@Order(10)
public class RequestBodyModifyFilter implements GlobalFilter{
    @Resource
    private ModifyRequestBodyGatewayFilterFactory modifyRequestBodyGatewayFilterFactory;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        return reqBodyRewriter().filter(exchange, chain);
    }

    /**
     * 修改请求体的filter
     */
    @Bean
    private GatewayFilter reqBodyRewriter(){
        return modifyRequestBodyGatewayFilterFactory.apply(new ModifyRequestBodyGatewayFilterFactory.Config().setRewriteFunction(
                String.class, String.class, rewriteFunction()
        ));
    }

    /**
     * 此处是对原请求体的修改方法
     */
    private RewriteFunction<String, String> rewriteFunction(){
        return (serverWebExchange, s) -> {
            //对请求体进行操作、s为原请求体
            return Mono.just("修改后的结果");
        };
    }
}