springcloudgateway拦截器例子

冷不防 2023-07-06 14:36 29阅读 0赞

springcloudgateway写2个filter，一个GlobalFilter实现公共token的校验，一个实现具体应用的拦截器逻辑。

package com.example.gate.filter;
    
    import java.io.IOException;
    import java.nio.charset.StandardCharsets;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.List;
    import java.util.Map;
    
    import org.reactivestreams.Publisher;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.cloud.gateway.filter.GatewayFilterChain;
    import org.springframework.cloud.gateway.filter.GlobalFilter;
    import org.springframework.core.Ordered;
    import org.springframework.core.io.buffer.DataBuffer;
    import org.springframework.core.io.buffer.DataBufferUtils;
    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.http.server.reactive.ServerHttpResponseDecorator;
    import org.springframework.util.MultiValueMap;
    import org.springframework.web.server.ServerWebExchange;
    import org.synchronoss.cloud.nio.multipart.util.IOUtils;
    
    import reactor.core.publisher.Flux;
    import reactor.core.publisher.Mono;
    
    public class TokenFilter implements GlobalFilter, Ordered {
    
    	Logger logger = LoggerFactory.getLogger(TokenFilter.class);
    
    	@Override
    	public int getOrder() {
    		// TODO Auto-generated method stub
    		return 120;
    	}
    	
    	@Override
    	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
    		logger.info("TokenFilter开始............");
    		
    		getAllParamtersRequest(exchange.getRequest());
    		getAllHeadersRequest(exchange.getRequest());
    		
    		
    		//拦截的逻辑。根据具体业务逻辑做拦截。
    		String token = exchange.getRequest().getQueryParams().getFirst("token");
    		if (token == null || token.isEmpty()) {
    			logger.info("token is empty...");
    //			exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
    //			return exchange.getResponse().setComplete();
    			
    			//设置status和body
    	        return Mono.defer(() -> {
    	            exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);//设置status
    	            final ServerHttpResponse response = exchange.getResponse();
    	            byte[] bytes = "{\"code\":\"99999\",\"message\":\"非法访问,没有检测到token~~~~~~\"}".getBytes(StandardCharsets.UTF_8);
    	            DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(bytes);
    	            response.getHeaders().set("aaa", "bbb");//设置header
    	            logger.info("TokenFilter拦截非法请求，没有检测到token............");
    	            return response.writeWith(Flux.just(buffer));//设置body
    	        });
    		}
    		
    		//没有被if条件拦截，就放行
    		return chain.filter(exchange);
    	}
    	
    	
    	private Map getAllParamtersRequest(ServerHttpRequest request) {
    		logger.info("getAllParamtersRequest开始............");
    		Map map = new HashMap();
    		MultiValueMap<String, String> paramNames = request.getQueryParams();
    		Iterator it= paramNames.keySet().iterator();
    		while (it.hasNext()) {
    			String paramName = (String) it.next();
    			
    			List<String> paramValues = paramNames.get(paramName);
    			if (paramValues.size() >= 1) {
    				String paramValue = paramValues.get(0);
    				logger.info("request参数："+paramName+",值："+paramValue);
    				map.put(paramName, paramValue);
    			}
    		}
    		return map;
    	}
    	
    	private Map getAllHeadersRequest(ServerHttpRequest request) {
    		logger.info("getAllHeadersRequest开始............");
    		Map map = new HashMap();
    		HttpHeaders hearders = request.getHeaders();
    		Iterator it= hearders.keySet().iterator();
    		while (it.hasNext()) {
    			String keyName = (String) it.next();
    			
    			List<String> headValues = hearders.get(keyName);
    			if (headValues.size() >= 1) {
    				String kvalue = headValues.get(0);
    				logger.info("request header的key："+keyName+",值："+kvalue);
    				map.put(keyName, kvalue);
    			}
    		}
    		return map;
    	}
    	
    //	/**
    //	 * 
    //	 * @param request
    //	 * @return
    //	 */
    //	private Map getAllParamtersRequest(HttpServletRequest request) {
    //		logger.info("getAllParamtersRequest............");
    //		Map map = new HashMap();
    //		Enumeration paramNames = request.getParameterNames();
    //		while (paramNames.hasMoreElements()) {
    //			String paramName = (String) paramNames.nextElement();
    //			String[] paramValues = request.getParameterValues(paramName);
    //			if (paramValues.length >= 1) {
    //				String paramValue = paramValues[0];
    //				if (paramValue.length() != 0) {
    //					logger.info("request参数："+paramName+",值："+paramValue);
    //					map.put(paramName, paramValue);
    //				}
    //
    //			}
    //		}
    //		return map;
    //	}
    
    }

package com.example.gate.filter;
    
    import java.net.InetSocketAddress;
    import java.net.URI;
    import java.nio.charset.StandardCharsets;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.cloud.gateway.filter.GatewayFilter;
    import org.springframework.cloud.gateway.filter.GatewayFilterChain;
    import org.springframework.core.Ordered;
    import org.springframework.core.io.buffer.DataBuffer;
    import org.springframework.http.HttpMethod;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.server.RequestPath;
    import org.springframework.http.server.reactive.ServerHttpResponse;
    import org.springframework.web.server.ServerWebExchange;
    
    import reactor.core.publisher.Flux;
    import reactor.core.publisher.Mono;
    
    /**
     * 
     * Ordered 负责filter的顺序，数字越小越优先，越靠前。
     * 
     * GatewayFilter：
     * 需要通过spring.cloud.routes.filters 配置在具体路由下，
     * 只作用在当前路由上或通过spring.cloud.default-filters配置在全局，作用在所有路由上。
     * 需要用代码的形式，配置一个RouteLocator，里面写路由的配置信息。
     * 
     * GlobalFilter：
     * 全局过滤器，不需要在配置文件中配置，作用在所有的路由上，最终通过GatewayFilterAdapter包装成GatewayFilterChain可识别的过滤器，
     * 它为请求业务以及路由的URI转换为真实业务服务的请求地址的核心过滤器，不需要配置，系统初始化时加载，并作用在每个路由上。
     * 代码配置需要声明一个GlobalFilter对象。
     * 
     * 
     * 对一个应用来说，GatewayFilter和GlobalFilter是等价的，order也会按照顺序进行拦截。所以两个order不要写一样！
     * 
     * @author lsy
     *
     */
    public class UrlFilter implements GatewayFilter, Ordered {
    
    	Logger logger = LoggerFactory.getLogger(UrlFilter.class);
    	
    	@Override
    	public int getOrder() {
    		return 0;
    	}
    
    	@Override
    	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
    		logger.info("UrlFilter开始............");
    		URI uri = exchange.getRequest().getURI();
    		logger.info("UrlFilter开始............URI==="+uri.toString());
    		
    		HttpMethod method = exchange.getRequest().getMethod();
    		logger.info("UrlFilter开始............HttpMethod==="+method.toString());
    		
    		String methodValue= exchange.getRequest().getMethodValue();
    		logger.info("UrlFilter开始............getMethodValue==="+methodValue);
    		
    		
    		RequestPath requestPath =exchange.getRequest().getPath();
    		logger.info("UrlFilter开始............RequestPath==="+requestPath.toString());
    		
    		InetSocketAddress inetSocketAddress =exchange.getRequest().getRemoteAddress();
    		logger.info("UrlFilter开始............InetSocketAddress==="+inetSocketAddress.toString());
    		
    		
    		//拦截的逻辑。根据具体业务逻辑做拦截。
    		String perm = exchange.getRequest().getQueryParams().getFirst("perm");
    		if (perm == null || perm.isEmpty()) {
    			logger.info("perm is empty...");
    			//设置HttpStatus，返回体是空的
    //					exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
    //					return exchange.getResponse().setComplete();
    			
    			//下面可以设置返回体的具体内容
    			//设置status和body
    	        return Mono.defer(() -> {
    	            exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);//设置status
    	            final ServerHttpResponse response = exchange.getResponse();
    	            byte[] bytes = "{\"code\":\"99000\",\"message\":\"非法访问,没有检测到权限码perm~~~~~~\"}".getBytes(StandardCharsets.UTF_8);
    	            DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(bytes);
    	            response.getHeaders().set("permValid", "false");//设置header
    	            logger.info("UrlFilter拦截非法请求，没有检测到权限码perm............");
    	            return response.writeWith(Flux.just(buffer));//设置body
    	        });
    		}
    		
    		//没有被if条件拦截，就放行
    		return chain.filter(exchange);
    	}
    
    }

package com.example.gate.config;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.cloud.gateway.filter.GatewayFilter;
    import org.springframework.cloud.gateway.filter.GlobalFilter;
    import org.springframework.cloud.gateway.route.RouteLocator;
    import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import com.example.gate.filter.TokenFilter;
    import com.example.gate.filter.UrlFilter;
    
    @Configuration
    public class FilterConfig {
    
    	Logger logger = LoggerFactory.getLogger(FilterConfig.class);
    	
    	@Bean
    	public GlobalFilter tokenFilter() {
    	    return new TokenFilter();
    	}
    	
    	
    	
    	
    	@Bean
        public RouteLocator urlFilterRouteLocator(RouteLocatorBuilder builder) {
    		logger.info("FilterConfig---urlFilterRouteLocator---");
            return builder.routes()
                    .route(r -> r.path("/one/**")
                            .filters(f -> f.stripPrefix (1).filter(new UrlFilter())
                                    .addResponseHeader("urlFilterFlag", "pass"))
                            .uri("lb://one")
                            .order(0)
                            .id("one")
                    )
                    .build();
        }
    	
    	
    	
    }

server: 
       port: 8888
       
    spring:
      application:
        name: gate
      cloud:
        consul:
          host: 127.0.0.1  #注册中心的ip或host。也是集群地址，配置一个即可。
          port: 8500
          discovery:
            #enabled: true #使用服务发现客户端定义路由信息。即不配置routes节点，采用默认配置;配置了，以配置为准。默认true。
            register: true #是否将服务注册到Consul集群中心
            deregister: true #默认true，服务停止时注销服务，即从服务列表中删除。设置成false的话，？？？
            #service-name: ${spring.application.name}  #注册在consul上面的名字，在consul的调用中，是通过此名字调用的。默认服务名,不要改
            instance-id: ${spring.application.name}-${spring.cloud.client.ip-address}:${server.port} #只供显示用,在ID列显示
            health-check-interval: 5s  #配置 Consul 健康检查频率，也就是心跳频率。
            health-check-critical-timeout: 1s #健康检查失败多长时间后，取消注册。在node上显示红色叉。
            #health-check-path: /tmp #健康检查路径
            #prefer-ip-address: true #表示注册时使用IP而不是hostname
        gateway:
          discovery:
            locator:
              enabled: true #表明gateway开启服务注册和发现的功能，并且自动根据服务发现为每一个服务创建了一个router，这个router将以服务名开头的请求路径转发到对应的服务
              lower-case-service-id: true # 服务名小写
    #      routes:
    #      - id: one
    #        # lb代表从注册中心获取服务，且已负载均衡方式转发
    #        uri: lb://one #目标服务地址
    #        predicates: #路由条件
    #          - Path=/one/**
    #        #过滤规则。 StripPrefix=1标识去掉url的第一个前缀，用后面的内容拼接到uri后面
    #        filters:
    #          - StripPrefix=1
    #      - id: two
    #        # lb代表从注册中心获取服务，且已负载均衡方式转发
    #        uri: lb://two #目标服务地址
    #        predicates: #路由条件
    #          - Path=/two/**
    #        #过滤规则。 StripPrefix=1标识去掉url的第一个前缀，用后面的内容拼接到uri后面
    #        filters:
    #          - StripPrefix=1
            
    
    #eureka:
    #  instance:
    #    prefer-ip-address: true
    #    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${server.port}
    #    lease-expiration-duration-in-seconds: 10
    #    lease-renewal-interval-in-seconds: 3
    #  client:
    #    registry-fetch-interval-seconds: 5
    #    serviceUrl:
    #      defaultZone: http://localhost:8761/eureka/
    
    #启用监控.开启监控后，可直接通过actuator的rest接口查看服务的详细信息。例如查看网关的路由：http://localhost:8888/actuator/gateway/routes
    management:
      endpoints:
        web:
          exposure:
            include: 
            - "*"  # 开放所有端点health，info，metrics，通过actuator/+端点名就可以获取相应的信息。默认打开health和info
      endpoint:
        health:
          show-details: always  #未开启actuator/health时，我们获取到的信息是{"status":"UP"}，status的值还有可能是 DOWN。开启后打印详细信息

我起2个微服务，一个叫one,一个叫two。都有一个测试的controller：

package com.example.one.controller;
    
    import java.time.LocalDateTime;
    import java.time.format.DateTimeFormatter;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    //@Component
    @RestController
    //@RequestMapping("/beat")
    public class HelloController {
    	
    	@Value("${spring.cloud.client.ip-address}")
    	private String ip;
    	
    	@Value("${spring.application.name}")
    	private String servername;
    	
    	@Value("${server.port}")
    	private String port;
    	
    //	@Autowired
    //	private ComConfig conf;
    
    	@GetMapping(value="/hello")
    	public String hello() {
    		String[] colorArr=new String[] {"red","blue","green","pink","gray"};
    		DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    //        LocalDateTime startTime = LocalDateTime.now();
    		String message="hello !  I am   <span style=\"color:"+colorArr[0]+"\">["+servername+":"+ip+":"+port+"]</span>"+"..."+LocalDateTime.now().format(df);
    		System.out.println(message);
    		return message;
    	}
    }

根据以上代码，我定义了一个全局的过滤器TokenFilter，给one服务添加了UrlFilter（two没有）

经测试，全局拦截器对2个应用都起作用。UrlFilter只对one起作用。

值得注意的是，对于one，他有2个Filter。顺序是按照order来得。对于他来说已经不分GatewayFilter和GlobalFilter了。