springboot webflux 过滤器（WebFilter）

逃离我推掉我的手 2023-02-19 14:27 23阅读 0赞

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### springboot webflux 过滤器（WebFilter） ###

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**相关类与接口**

**WebFilter**

public interface WebFilter {
        Mono<Void> filter(ServerWebExchange var1, WebFilterChain var2);
    }

**WebFilterChain**

public interface WebFilterChain {
        Mono<Void> filter(ServerWebExchange var1);
    }

**DefaultWebFilterChain**

public class DefaultWebFilterChain implements WebFilterChain {
        private final List<WebFilter> allFilters;
        private final WebHandler handler;
        @Nullable
        private final WebFilter currentFilter;
        @Nullable
        private final DefaultWebFilterChain chain;
    
        public DefaultWebFilterChain(WebHandler handler, List<WebFilter> filters) {
            Assert.notNull(handler, "WebHandler is required");
            this.allFilters = Collections.unmodifiableList(filters);
            this.handler = handler;
            DefaultWebFilterChain chain = initChain(filters, handler);
            this.currentFilter = chain.currentFilter;
            this.chain = chain.chain;
        }
    
        private static DefaultWebFilterChain initChain(List<WebFilter> filters, WebHandler handler) {
            DefaultWebFilterChain chain = new DefaultWebFilterChain(filters, handler, (WebFilter)null, (DefaultWebFilterChain)null);
    
            for(ListIterator iterator = filters.listIterator(filters.size()); iterator.hasPrevious(); chain = new DefaultWebFilterChain(filters, handler, (WebFilter)iterator.previous(), chain)) {
            }
    
            return chain;
        }
    
        private DefaultWebFilterChain(List<WebFilter> allFilters, WebHandler handler, @Nullable WebFilter currentFilter, @Nullable DefaultWebFilterChain chain) {
            this.allFilters = allFilters;
            this.currentFilter = currentFilter;
            this.handler = handler;
            this.chain = chain;
        }
    
        public List<WebFilter> getFilters() {
        public WebHandler getHandler() {
    
    
        public Mono<Void> filter(ServerWebExchange exchange) {
            return Mono.defer(() -> {
                return this.currentFilter != null && this.chain != null ? this.invokeFilter(this.currentFilter, this.chain, exchange) : this.handler.handle(exchange);
            });
        }
    
        private Mono<Void> invokeFilter(WebFilter current, DefaultWebFilterChain chain, ServerWebExchange exchange) {
            String currentName = current.getClass().getName();
            return current.filter(exchange, chain).checkpoint(currentName + " [DefaultWebFilterChain]");
        }
    }

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**示例**

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**filter 层**

**CustomWebFilter**

@Component
    public class CustomWebFilter implements WebFilter {
    
        @Override
        public Mono<Void> filter(ServerWebExchange serverWebExchange, WebFilterChain webFilterChain) {
            PathPattern pattern=new PathPatternParser().parse("/hello/**");
            ServerHttpRequest request=serverWebExchange.getRequest();
    
            if (pattern.matches(request.getPath().pathWithinApplication())){
                System.out.println("custom webFilter");
            }
    
            return webFilterChain.filter(serverWebExchange);
        }
    }

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**controller 层**

**HelloController**

@RestController
    public class HelloController {
    
        @RequestMapping("/hello")
        public String hello(){
            return "hello world";
        }
    }

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**使用测试**

**localhost:8080/hello，控制台输出：**

2020-06-21 10:33:51.035  INFO 14892 --- [           main] o.s.b.web.embedded.netty.NettyWebServer  : Netty started on port(s): 8080
    2020-06-21 10:33:51.045  INFO 14892 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.349 seconds (JVM running for 1.94)
    custom webFilter