背景
【SpringGateway中对SpringActuator路径进行权限验证】需要对spingActuator的监测路径进行拦截，从而实现弹窗输入登录信息的功能，但是gateway提供的GlobalFilter拦截器不生效，故研究了一番
解决方式
使用WebFilter进行拦截，拦截器代码如下：
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;
import sun.misc.BASE64Decoder;
import java.io.IOException;
import java.util.Objects;
@Order(2)
@Component
public class ActuatorFilter implements WebFilter {
@Override
public Mono filter(ServerWebExchange exchange, WebFilterChain chain) {
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
String uriPath = request.getURI().getPath();
if(uriPath.startsWith("/actuator/")) {
String auth = request.getHeaders().getFirst(HttpHeaders.AUTHORIZATION);
if(Objects.isNull(auth)){
System.out.println("校验请求头为空，需进行登录..");
response.getHeaders().add(HttpHeaders.WWW_AUTHENTICATE,"Basic realm="."");
response.setStatusCode(HttpStatus.UNAUTHORIZED);
return response.setComplete();
}else {
System.out.println("auth:" + auth);
BASE64Decoder decoder = new BASE64Decoder();
String[] values = new String[0];
try {
values = new String(decoder.decodeBuffer(auth.split(" ")[1])).split(":");
} catch (IOException e) {
throw new RuntimeException(e);
}
if (values.length == 2) {
String username = values[0];
String pwd = values[1];
System.out.println("username:" + username);
System.out.println("pwd:" + pwd);
if(Objects.equals("test",username) && Objects.equals("test",pwd)){
return chain.filter(exchange);
}else {
response.getHeaders().add(HttpHeaders.WWW_AUTHENTICATE,"Basic realm="."");
response.setStatusCode(HttpStatus.UNAUTHORIZED);
return response.setComplete();
}
}
}
}
return chain.filter(exchange);
}
} 
