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Gateway 获取 RequestBody

百度搜了一大堆文献，全部什么改源码，封装Body啥的，都很复杂，这里直接利用的 Gateway 源码中的 CacheRequestBodyGatewayFilterFactory 缓存了RequestBody，我们先让它执行，然后执行我们的逻辑，即可直接取出RequestBody。

Gateway版本:

org.springframework.cloud:spring-cloud-starter-gateway:3.1.1

直接上代码:

import com.alibaba.fastjson.JSON;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.cloud.gateway.support.ServerWebExchangeUtils;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.react