SpringBoot增加网关服务

一、新建gateway项目

二、添加依赖

dependencies {       implementation 'org.springframework.cloud:spring-cloud-starter-gateway:4.0.0' }

三、增加路由规则配置

一个web服务、一个service服务

bootstrap.yaml：

server:   port: 80 spring:   application:     name: gateway   cloud:     nacos:       discovery:         server-addr: ${NACOS_ADDR:127.0.0.1:8848}         namespace: ${NACOS_NAMESPACE:demo}         username: nacos         password: nacos       config:         #nacos配置中心服务器地址         server-addr: ${NACOS_ADDR:127.0.0.1:8848}         #nacos配置中心命名空间         namespace: ${NACOS_NAMESPACE:demo}         #文件后缀格式         file-extension: yaml         #nacos配置中心分组         group: ${spring.application.name}         username: nacos         password: nacos         #扩展文件，目前用于全局共享，下面的优先级高         ext-config:           - data-id: commom.yaml             group: common             refresh: true  

application.yaml：

spring:   main:     web-application-type: reactive   cloud:     gateway:       routes:         #业务服务         - id: web_route           uri: lb://web           predicates:             - Path=/web/**           filters:             - RewritePath=/(?<segment>.*),/$\{segment}         #支撑服务         - id: service_route           uri: lb://service           predicates:             - Path=/service/**           filters:             - RewritePath=/(?<segment>.*),/$\{segment}

四、增加过滤器（可选）

比如认证、鉴权、日志打印等

例如：打印日志，用@Slf4j 注解来简化日志记录、

增加依赖

		compileOnly 'org.projectlombok:lombok:1.18.24' // 使用最新版本 		annotationProcessor 'org.projectlombok:lombok:1.18.24' 		implementation 'org.slf4j:slf4j-api:2.0.6' 		runtimeOnly 'ch.qos.logback:logback-classic:1.4.5'

代码：

@Slf4j @Component public class RequestLogFilter implements GlobalFilter, Ordered {      private static final String START_TIME_KEY = "startTime";      @Override     public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {          ServerHttpRequest request = exchange.getRequest();         String method = Objects.requireNonNull(request.getMethod()).name();          String requestURI = request.getPath().toString();         String remoteAddr = Objects.requireNonNull(request.getRemoteAddress()).getHostString();          System.out.println("method=" + method +";requestURI= "+ requestURI+ "; remoteAddr="+remoteAddr);         log.info("method=" + method +";requestURI= "+ requestURI+ "; remoteAddr="+remoteAddr);          return chain.filter(exchange);     }      @Override     public int getOrder() {         return 1;     } } 

五、增加启动类并运行测试

@SpringBootApplication(scanBasePackages = {"com.example"}) @EnableDiscoveryClient public class GatewayApplication {      public static void main(String[] args) {         SpringApplication.run(GatewayApplication.class, args);     }  } 

运行访问，用80端口

六、遇到的问题

1、启动报错

缺少依赖的包

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled. 2024-07-16T16:27:44.792+08:00 ERROR 9924 --- [gateway] [           main] o.s.b.d.LoggingFailureAnalysisReporter   :   *************************** APPLICATION FAILED TO START ***************************  Description:  Web application could not be started as there was no org.springframework.boot.web.reactive.server.ReactiveWebServerFactory bean defined in the context.  Action:  Check your application's dependencies for a supported reactive web server. Check the configured web application type.