gateway拦截请求参数修改

public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
    try {
        if(!exchange.getRequest().getPath().toString().equals("/hcp-system/sysLogin/enterLogin")){
            if(exchange.getRequest().getHeaders().get("token") != null || exchange.getRequest().getMethod().toString().equals("GET")){
                try {
                    exchange.getRequest().getURI().getQuery();
                    String str = exchange.getRequest().getHeaders().get("token").get(0);
                    Claims claims = Jwts.parser().setSigningKey("sxygsj!2q".getBytes()).parseClaimsJws(str).getBody();
                    String method = exchange.getRequest().getMethodValue();
                    if(method.equals("POST")) {
                        return factory.apply(new ModifyRequestBodyGatewayFilterFactory.Config()
                                        .setRewriteFunction(String.class,String.class,(_exchange, body) -> {
                                            // 进行参数修改
                                            Map<String,Object> map = JSON.parseObject(body);
                                            map.put("text","啦啦啦");
                                            return Mono.just(map.toString());
                                        }))
                                .filter(exchange, chain);
                    }
                }catch (Exception exception){
                    throw new Error("token不合法");
                }
            }else {
                throw new Error("token不可为空");
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return chain.filter(exchange).then(Mono.defer(() -> {
        exchange.getResponse().getHeaders().entrySet().stream()
                .filter(kv -> (kv.getValue() != null && kv.getValue().size() > 1))
                .filter(kv -> (kv.getKey().equals(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN)
                        || kv.getKey().equals(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS)))
                .forEach(kv ->
                {
                    kv.setValue(new ArrayList<String>() {{
                        add(kv.getValue().get(0));
                    }});
                });
        return chain.filter(exchange);
    }));
}