# enabled：默認(rèn)為false，設(shè)置為true表明spring cloud gateway開(kāi)啟服務(wù)發(fā)現(xiàn)和路由的功能，網(wǎng)關(guān)自動(dòng)根據(jù)注冊(cè)中心的服務(wù)名為每個(gè)服務(wù)創(chuàng)建一個(gè)router，將以服務(wù)名開(kāi)頭的請(qǐng)求路徑轉(zhuǎn)發(fā)到對(duì)應(yīng)的服務(wù)
spring.cloud.gateway.discovery.locator.enabled = true
# lowerCaseServiceId：?jiǎn)?dòng) locator.enabled=true 自動(dòng)路由時(shí)，路由的路徑默認(rèn)會(huì)使用大寫(xiě)ID，若想要使用小寫(xiě)ID，可將lowerCaseServiceId設(shè)置為true
spring.cloud.gateway.discovery.locator.lower-case-service-id = true

# 重寫(xiě)過(guò)濾鏈，解決項(xiàng)目設(shè)置了 server.servlet.context-path 導(dǎo)致 locator.enabled=true 默認(rèn)路由策略404的問(wèn)題
spring.cloud.gateway.discovery.locator.filters[0] = PreserveHostHeader

@Configuration
public class GatewayConfig
{
    @Value ("${server.servlet.context-path}")
    private String prefix;
 
    /**
     * 過(guò)濾 server.servlet.context-path 屬性配置的項(xiàng)目路徑，防止對(duì)后續(xù)路由策略產(chǎn)生影響，因?yàn)?gateway 網(wǎng)關(guān)不支持 servlet
     */
    @Bean
    @Order (-1)
    public WebFilter apiPrefixFilter()
    {
        return (exchange, chain) ->
        {
            ServerHttpRequest request = exchange.getRequest();
            String path = request.getURI().getRawPath();
            path = path.startsWith(prefix) ? path.replaceFirst(prefix, "") : path;
            ServerHttpRequest newRequest = request.mutate().path(path).build();
            return chain.filter(exchange.mutate().request(newRequest).build());
        };
    }
}

<dependency>
			<groupId>com.github.xiaoymin</groupId>
			<artifactId>knife4j-spring-boot-starter</artifactId>
			<version>2.0.4</version>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
		</dependency>

import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.server.ServerWebExchange;
 
@Configuration
public class SwaggerHeaderFilter extends AbstractGatewayFilterFactory
{
    private static final String HEADER_NAME = "X-Forwarded-Prefix";
    private static final String URI = "/v2/api-docs";
    @Override
    public GatewayFilter apply(Object config)
    {
        return (exchange, chain) -> {
            ServerHttpRequest request = exchange.getRequest();
            String path = request.getURI().getPath();
            if(StringUtils.endsWithIgnoreCase(path, URI))
            {
                String basePath = path.substring(0, path.lastIndexOf(URI));
                ServerHttpRequest newRequest = request.mutate().header(HEADER_NAME, basePath).build();
                ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
                return chain.filter(newExchange);
            }
            else
                return chain.filter(exchange);
        };
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;
 
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
 * 使用Spring Boot單體架構(gòu)集成swagger時(shí)，是通過(guò)包路徑進(jìn)行業(yè)務(wù)分組，然后在前端進(jìn)行不同模塊的展示，而在微服務(wù)架構(gòu)下，單個(gè)服務(wù)類(lèi)似于原來(lái)業(yè)務(wù)組；
 * springfox-swagger提供的分組接口是swagger-resource，返回的是分組接口名稱(chēng)、地址等信息；
 * 在Spring Cloud微服務(wù)架構(gòu)下，需要swagger-resource重寫(xiě)接口，由網(wǎng)關(guān)的注冊(cè)中心動(dòng)態(tài)發(fā)現(xiàn)所有的微服務(wù)文檔
 */
@Primary
@Configuration
public class SwaggerResourceConfig implements SwaggerResourcesProvider
{
    @Autowired
    private RouteLocator routeLocator;
    
    // 網(wǎng)關(guān)應(yīng)用名稱(chēng)
    @Value ("${spring.application.name}")
    private String applicationName;
    //接口地址
    private static final String API_URI = "/v2/api-docs";
    @Override
    public List<SwaggerResource> get() {
        //接口資源列表
        List<SwaggerResource> resources = new ArrayList<>();
        //服務(wù)名稱(chēng)列表
        List<String> routeHosts = new ArrayList<>();
        // 獲取所有可用的應(yīng)用名稱(chēng)
        routeLocator.getRoutes()
                .filter(route -> route.getUri().getHost() != null)
                .filter(route -> !applicationName.equals(route.getUri().getHost()))
                .subscribe(route -> routeHosts.add(route.getUri().getHost()));
        // 去重，多負(fù)載服務(wù)只添加一次
        Set<String> existsServer = new HashSet<>();
        routeHosts.forEach(host -> {
            // 拼接url
            String url = "/" + host + API_URI;
            //不存在則添加
            if (!existsServer.contains(url)) {
                existsServer.add(url);
                SwaggerResource swaggerResource = new SwaggerResource();
                swaggerResource.setUrl(url);
                swaggerResource.setName(host);
                resources.add(swaggerResource);
            }
        });
        return resources;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;
import springfox.documentation.swagger.web.*;
 
import java.util.Optional;
/**
 * 獲取api接口信息
 */
@RestController
@RequestMapping ("/swagger-resources")
public class SwaggerHandler
{
    @Autowired(required = false)
    private SecurityConfiguration securityConfiguration;
    private UiConfiguration uiConfiguration;
    private final SwaggerResourcesProvider swaggerResources;
    @Autowired
    public SwaggerHandler(SwaggerResourcesProvider swaggerResources) {
        this.swaggerResources = swaggerResources;
    }
    @GetMapping("/configuration/security")
    public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration()
    {
        return Mono.just(new ResponseEntity<>(Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
    @GetMapping ("/configuration/ui")
    public Mono<ResponseEntity<UiConfiguration>> uiConfiguration()
        return Mono.just(new ResponseEntity<>(Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));
    @GetMapping("")
    public Mono<ResponseEntity> swaggerResources()
        return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));
}

<!-- knife4j文檔，微服務(wù)架構(gòu) -->
<dependency>
    <groupId>com.github.xiaoymin</groupId>
    <artifactId>knife4j-micro-spring-boot-starter</artifactId>
    <version>2.0.4</version>
</dependency>

import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.async.DeferredResult;
import springfox.documentation.builders.*;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.paths.RelativePathProvider;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
 
import javax.servlet.ServletContext;
/**
 * @description: swagger配置文件
 **/
@Configuration
@EnableSwagger2
@EnableKnife4j
public class Swagger2Config
{
    @Value("${spring.profiles.active}")
    private String env;
    @Value("${spring.application.name}")
    private String serviceName;
    @Value("${gateway.service.name}")
    private String serviceNameForGateway;
    @Bean
    public Docket createDocket(ServletContext servletContext)
    {
        Docket docket = new Docket(DocumentationType.SWAGGER_2)
                .genericModelSubstitutes(DeferredResult.class)
                .forCodeGeneration(true)
                .pathMapping("/")
                .select()
                .build()
                .apiInfo(new ApiInfoBuilder()
                        .title(serviceName + "接口文檔")
                        .version("1.0")
                        .contact(new Contact("xxx","",""))
                        .license("XXX有限公司")
                        .build())
                // 如果為生產(chǎn)環(huán)境，則不創(chuàng)建swagger
                .enable(!"real".equals(env));
        // 在knife4j前端頁(yè)面的地址路徑中添加gateway網(wǎng)關(guān)的項(xiàng)目名，解決在調(diào)試接口、發(fā)送請(qǐng)求出現(xiàn)404的問(wèn)題
        docket.pathProvider(new RelativePathProvider(servletContext)
        {
            @Override
            public String getApplicationBasePath()
            {
                return "/" + serviceNameForGateway + super.getApplicationBasePath();
            }
        });
        return docket;
    }
}