GateWay部分接口理解之GatewayFilter、GlobalFilter

1 public interface GlobalFilter {
2     Mono filter(ServerWebExchange exchange, GatewayFilterChain chain);
3 }

全局过滤器

当网关模块，我们定义filter时，首先需要实现上述接口，并加入到spring容器中 ，filter按自己业务是否需要 @Order/接口形式来指定执行的顺序，数字越小，优先级越高。

@Component
public class IPCheckFilter implements GlobalFilter, Ordered {
    @Override
    public int getOrder() {
        return 0;
 }


    @Override
    public Mono filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 获取请求头
        HttpHeaders headers = exchange.getRequest().getHeaders();
        // 根据ip来进行对比
        if (getIp(headers).equals("黑名单ip")) {
            ServerHttpResponse response = exchange.getResponse();
            ResponseData data = new ResponseData();
            data.setCode(401);
            data.setMessage("非法请求，请联系管理员");
            byte[] datas = JsonUtils.toJson(data).getBytes(StandardCharsets.UTF_8);
            DataBuffer buffer = response.bufferFactory().wrap(datas);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
            return response.writeWith(Mono.just(buffer));
        }
        return chain.filter(exchange);
    }
}        

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public interface GatewayFilter extends ShortcutConfigurable {}

一般是结合AbstractGatewayFilterFactory来做部分模块自定义过滤的

public class ValidateCodeFilter extends AbstractGatewayFilterFactory