增加 spring cloud gateway 网关的示例

labx-08/labx-08-sc-gateway-demo07-hystrix/pom.xml

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>labx-08</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>labx-08-sc-gateway-demo07-hystrix</artifactId>
+
+    <properties>
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
+        <spring.cloud.alibaba.version>2.2.0.RELEASE</spring.cloud.alibaba.version>
+    </properties>
+
+    <!--
+        引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
+        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系
+     -->
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring.cloud.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>com.alibaba.cloud</groupId>
+                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
+                <version>${spring.cloud.alibaba.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <!-- 引入 Spring Cloud Gateway 相关依赖，使用它作为网关，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-gateway</artifactId>
+        </dependency>
+
+        <!-- 引入 Hystrix 相关依赖，使用它实现服务容错，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

labx-08/labx-08-sc-gateway-demo07-hystrix/src/main/java/cn/iocoder/springcloud/labx08/gatewaydemo/GatewayApplication.java

@@ -0,0 +1,13 @@
+package cn.iocoder.springcloud.labx08.gatewaydemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class GatewayApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GatewayApplication.class, args);
+    }
+
+}

labx-08/labx-08-sc-gateway-demo07-hystrix/src/main/java/cn/iocoder/springcloud/labx08/gatewaydemo/controller/FallbackController.java

@@ -0,0 +1,24 @@
+package cn.iocoder.springcloud.labx08.gatewaydemo.controller;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.cloud.gateway.support.ServerWebExchangeUtils;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ServerWebExchange;
+
+@RestController
+public class FallbackController {
+
+    private Logger logger = LoggerFactory.getLogger(FallbackController.class);
+
+    @GetMapping("/fallback")
+    public String fallback(ServerWebExchange exchange) {
+//        URI requestUrl = exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR);
+        Throwable executionException = exchange.getAttribute(ServerWebExchangeUtils.HYSTRIX_EXECUTION_EXCEPTION_ATTR);
+        logger.error("[fallback][发生异常]", executionException);
+
+        return "服务降级..." + executionException.getMessage();
+    }
+
+}

labx-08/labx-08-sc-gateway-demo07-hystrix/src/main/resources/application.yaml

@@ -0,0 +1,21 @@
+server:
+  port: 8888
+
+spring:
+  application:
+    name: gateway-application
+
+  cloud:
+    # Spring Cloud Gateway 配置项，对应 GatewayProperties 类
+    gateway:
+      # 路由配置项，对应 RouteDefinition 数组
+      routes:
+        - id: hystrix_test
+          uri: http://127.0.0.1:18181
+          predicates:
+            - Path=/**
+          filters:
+            - name: Hystrix
+              args:
+                name: fallbackcmd # 对应的 Hystrix Command 名字
+                fallbackUri: forward:/fallback # 处理 Hystrix fallback 的情况，重定向到指定地址

labx-08/pom.xml

@@ -24,6 +24,8 @@
 
         <module>labx-08-sc-gateway-demo06-rate-limiter</module>
 
+        <module>labx-08-sc-gateway-demo07-hystrix</module>
+
         <module>labx-08-sc-user-service</module>
     </modules>