有没有办法在spring webflux中为特定的url执行WebFilter答案

【问题标题】：Is there a way to execute WebFilter for a specific urls in spring webflux有没有办法在spring webflux中为特定的url执行WebFilter
【发布时间】：2019-09-23 18:08:18
【问题描述】：

我有一个 WebFilter，我想为几个 url 排除它。

我使用了 PathPattern，它可以用来排除 1 个 url，但不能超过。

私有最终 PathPattern pathPattern;

public MyFilter() {
    pathPattern = new PathPatternParser().parse("/url");
}

@Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {

    if (pathPattern.matches(exchange.getRequest().getPath().pathWithinApplication())) {
        return chain.filter(exchange);
    }

【问题讨论】：

标签： spring-webflux

【解决方案1】：

您可以使用装饰器包装您的 WebFilter，该装饰器通过提供的 ServerWebExchangeMatcher 限制内部 WebFilter 调用。

@RequiredArgsConstructor
public class RestrictedWebFilterDecorator implements WebFilter {
    private final WebFilter inner;
    private final ServerWebExchangeMatcher restrictionMatcher;
    
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
        return restrictionMatcher.matches(exchange)
                .flatMap(result -> result.isMatch()
                        ? inner.filter(exchange, chain)
                        : chain.filter(exchange)
                );
    }
}

使用示例：

@Order(Ordered.HIGHEST_PRECEDENCE)
@Bean
public WebFilter yourWebFilter() {
    return new RestrictedWebFilterDecorator(
            new YourWebFilter,
            new NegatedServerWebExchangeMatcher(YOUR_EXCHANGE_MATCHER)
    );
}

【讨论】：

【解决方案2】：

有多种方法可以做到，下面是其中一种方法

@Slf4j
@Component
public class LogFilter implements WebFilter {

    List<PathPattern> pathPatternList;

    public LogFilter() {
        PathPattern pathPattern1 = new PathPatternParser()
                .parse("/admin");
        PathPattern pathPattern2 = new PathPatternParser().parse("/emp");
        pathPatternList = new ArrayList<>();
        pathPatternList.add(pathPattern1);
        pathPatternList.add(pathPattern2);

    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {

        RequestPath path = exchange.getRequest().getPath();
        if (pathPatternList.stream().anyMatch(pathPattern -> pathPattern.matches(path.pathWithinApplication()))) {
            log.info(path.toString() + " path excluded");
            return chain.filter(exchange);
        }
        log.info("executing logic for " + path.toString() + " path");
        return chain.filter(exchange);

    }
}

对于 Url /admin 和 /emp，它将排除其他 url 的逻辑，它将执行日志下面的逻辑检查

2019-05-10 00:20:55.660  INFO 15837 --- [ctor-http-nio-3] o.l.reactiveapp.filter.LogFilter         : /admin path excluded
2019-05-10 00:20:55.661  INFO 15837 --- [ctor-http-nio-3] o.l.r.controller.AdminController         : get admin
2019-05-10 00:20:58.361  INFO 15837 --- [ctor-http-nio-3] o.l.reactiveapp.filter.LogFilter         : /emp path excluded
2019-05-10 00:20:58.362  INFO 15837 --- [ctor-http-nio-3] o.l.r.controller.EmployeeController      : get employee
2019-05-10 00:21:03.649  INFO 15837 --- [ctor-http-nio-3] o.l.reactiveapp.filter.LogFilter         : executing logic for /messages/10 path
2019-05-10 00:21:03.651  INFO 15837 --- [ctor-http-nio-3] o.l.r.controller.StoresController        : getting message details for id 10 enter code here

我希望这能回答你的问题
谢谢

【讨论】：