1、code

import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Maps;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.http.HttpServletRequestWrapper;
import com.netflix.zuul.http.ServletInputStreamWrapper;
import org.springframework.util.StreamUtils;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Objects;

/**
 * @author code
 * @version 1.0
 * @Date 2021/12/21 9:14
 * @Description ${参数过滤器}
 */
public class ParamFilter extends ZuulFilter {

    @Override
    public String filterType() {
        return "pre";
    }

    @Override
    public int filterOrder() {
        return 2;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() {
        RequestContext ctx = RequestContext.getCurrentContext();
        String method = ctx.getRequest().getMethod();
        if("GET".equals(method.toUpperCase())){
            Map<String, List<String>> param = ctx.getRequestQueryParams();
            if(Objects.isNull(param) || param.isEmpty()){
                param = Maps.newHashMap();
            }
            param.put("accessKey", Arrays.asList("test"));
            param.put("secretKey", Arrays.asList("123456"));
            ctx.setRequestQueryParams(param);
        }else if("POST".equals(method.toUpperCase())){
            String charSet = ctx.getRequest().getCharacterEncoding();
            try{
                InputStream inputStream = ctx.getRequest().getInputStream();
                String body = StreamUtils.copyToString(inputStream, Charset.forName(charSet));
                JSONObject param = JSONObject.parseObject(body);
                if(Objects.isNull(param) || param.isEmpty()){
                    param = new JSONObject();

                    param.put("secret_key","ddd");
                    param.put("access_key","ddd");
                }

                final byte[] paramBytes = param.toJSONString().getBytes(charSet);
                rewriteRequest(ctx, paramBytes);
                ctx.addZuulRequestHeader("Content-type", "application/json");
            }catch (IOException e){
                e.printStackTrace();
            }
        }

        return null;
    }

    public static void rewriteRequest(RequestContext ctx, byte[] paramBytes){
        ctx.setRequest(new HttpServletRequestWrapper(ctx.getRequest()){
            @Override
            public ServletInputStream getInputStream() throws IOException{
                return new ServletInputStreamWrapper(paramBytes);
            }

            @Override
            public int getContentLength(){
                return paramBytes.length;
            }

            @Override
            public long getContentLengthLong(){
                return paramBytes.length;
            }
        });
    }
}

2、post提交时参数需要设置content-type

ctx.addZuulRequestHeader("Content-type", "application/json");

以json的格式传递至controller