1. gateway配置
server:
port: 9001
spring:
application:
name: platform-gateway
cloud:
gateway:
discovery:
locator:
enabled: true
lower-case-service-id: true
routes:
- id: platform-service111
uri: lb://platform-service
predicates:
- Path=/platform-service/**
- id: platform-redis222
uri: lb://platform-redis
predicates:
- Path=/platform-redis/**
default-filters: # 配置跨域,header去重
- DedupeResponseHeader=Vary Access-Control-Allow-Credentials Access-Control-Allow-Origin, RETAIN_UNIQUE
- DedupeResponseHeader=Access-Control-Allow-Origin, RETAIN_FIRST
- AddResponseHeader=Access-Control-Allow-Credentials,true
eureka:
instance:
prefer-ip-address: true
instance-id: ${spring.cloud.client.ip-address}:${server.port}
client:
service-url:
register-with-eureka: true
fetch-registy: true
defaultZone: http://172.10.101.123:7001/eureka/
gateway动态路由规则
cloud:
gateway:
discovery:
locator:
enabled: true
lower-case-service-id: true
使用这部分配置即可实现微服务名称自动进行动态路由配置,不需要再进行routes配置。
gateway的Path路径匹配规则
routes:
- id: platform-service111
uri: lb://platform-service
predicates:
- Path=/user/**
断言规则:platform-service-ip:port/user/** = gateway-ip:port/user/**
2.整合swagger
- 首先需要两个类:SwaggerResourcesConfig和SwaggerResourceController
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourcesConfig implements SwaggerResourcesProvider {
public static final String API_URI = "/v2/api-docs";
private final RouteLocator routeLocator;
private final GatewayProperties gatewayProperties;
/**
* 这个类是核心,这个类封装的是SwaggerResource,即在swagger-ui.html页面中顶部的选择框,选择服务的swagger页面内容。
* RouteLocator:获取spring cloud gateway中注册的路由
* RouteDefinitionLocator:获取spring cloud gateway路由的详细信息
* RestTemplate:获取各个配置有swagger的服务的swagger-resources
*/
@Override
public List<SwaggerResource> get() {
List<SwaggerResource> resources = new ArrayList<>();
List<String> routes = new ArrayList<>();
//取出gateway的route
routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
//结合配置的route-路径(Path),和route过滤,只获取有效的route节点
gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
.forEach(routeDefinition -> routeDefinition.getPredicates().stream()
.filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
.forEach(predicateDefinition -> resources.add(swaggerResource(routeDefinition.getId(),
predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
.replace("/**", API_URI)))));
return resources;
}
private SwaggerResource swaggerResource(String name, String location) {
SwaggerResource swaggerResource = new SwaggerResource();
swaggerResource.setName(name);
swaggerResource.setLocation(location);
swaggerResource.setSwaggerVersion("3.0.0");
return swaggerResource;
}
}
@RestController
@RequestMapping("/swagger-resources")
public class SwaggerResourceController {
@Autowired
private SwaggerResourcesConfig swaggerResources;
@Autowired(required = false)
private SecurityConfiguration securityConfiguration;
@Autowired(required = false)
private UiConfiguration uiConfiguration;
@Autowired
public SwaggerResourceController(SwaggerResourcesConfig 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)));
}
}
- 通过SwaggerResourcesConfig 知道,我们需要再gateway中配置routes
routes:
- id: platform-service111
uri: lb://platform-service
predicates:
- Path=/platform-service/**
- id: platform-redis222
uri: lb://platform-redis
predicates:
- Path=/platform-redis/**
参考SwaggerResourcesConfig 中的配置,可以知道id是swagger-ui.html页面中顶部的选择框的内容。
当我们切换选择框中的id时,会自动进行路由匹配。在这里又涉及到一个微服务进行动态路由转发的问题:
- 网关请求的路径为
http://localhost:9001/platform-service/v2/api-docs
,但实际*问的是http://localhost:8001/v2/api-docs
,这里是localhost:9001/platform-service/
覆盖了localhost:8001/
。
我猜想这是因为我们在前面通过enabled: true
配置了动态路由转发,swagger配置类中结合了Path的路径拼接成了/localhost:9001/platform-service/v2/api-docs
。但是这里并没有走uri+predicates的路径,所以没有出现路径错误的问题。(所以这里的route是针对swagger的路由设置的,不是gateway动态路由转发的路由配置)
(上图中显示的BaseURL说明是走的 locator 路由) - 还有一种情况是:比如我们不通过网关,直接访问微服务的swagger地址为:
localhost:8001/ps/v2/api-docs
;然后我们配置文件中这样写:
routes:
- id: platform-service111
uri: lb://platform-service
predicates:
- Path=/ps/**
(上图中显示的BaseURL说明是走的 routes 路由)
根据路由规则,localhost:9001/ps/**
= localhost:8001/ps/**
此时就是只是9001掩盖了8001。
swagger的配置类帮我们拼接了路径:/ps/v2/api-docs
因为这里路径中不是http://localhost:9001/platform-service/
,自然不会进行动态路由转发,所有就只是简单的走uri+predicates匹配规则。
但是第一种情况是因为开启了动态路由配置,刚好Path的断言规则恰好是它的微服务名称
究极总结:
- 配置routes是为了方便swagger选择,通过id进行切换
- 由于配置了 locator 会自动进行微服务名进行路由,所以当断言为
- Path=/platform-service/**
,swagger配置类会进行路径拼接,拼接成http://localhost:9001/platform-service/**
,这个时候呢,它走的就不是routes定义的路由匹配了,它走的是 locator 开启的自动根据微服务名进行路由匹配了。 - 当断言为
- Path=/ps/**
,swagger配置类拼接的成的路径为http://localhost:9001/ps/**
,因为此时9001跟的不是微服务名称,不能触发 locator 的自动路由匹配,这个时候呢,它走的就不是 locator了,它走的是routes开启的路由匹配。
参考:Spring Cloud Gateway整合Swagger聚合微服务系统API文档(非Zuul) 这篇文章和我的理解又出入,不能理解- Path=/admin/**
,他的微服务下面根本没有admin这个路径,怎么匹配的到呢
3.gateway处理跨域
spring cloud Gateway 处理跨域问题
spring gateway解决跨域问题
springcloud gateway解决跨域问题
@Configuration
public class CorsConfig implements WebFluxConfigurer {
@Override
public void addCorsMappings(CorsRegistry registry) {
/**
* 允许路径
* 允许跨域访问的源
* 允许请求地方法
* 预检间隔时间
* 允许头部设置
* 是否发送cookie
*/
registry.addMapping("/**")
.allowedOrigins("*")
.allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
.maxAge(10000)
.allowedHeaders("*")
.allowCredentials(true);
}
}