什麼是 Zuul

Zuul 即：服務閘道器，它包含了對請求的路由和過濾兩個主要功能

Zuul 的使用

1. 新建 Module：spring-cloud-zuul-9527

2. 編寫 pom 引入依賴

   pom.xml

   <?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>spring-cloud-netflix</artifactId>
           <groupId>com.kaishen</groupId>
           <version>1.0-SNAPSHOT</version>
       </parent>
       <modelVersion>4.0.0</modelVersion>
   
       <artifactId>spring-cloud-zuul-9527</artifactId>
   
       <properties>
           <maven.compiler.source>8</maven.compiler.source>
           <maven.compiler.target>8</maven.compiler.target>
       </properties>
   
       <!-- 引入該模組所需依賴 -->
       <dependencies>
           <!-- Eureka Client -->
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-eureka</artifactId>
           </dependency>
   
           <!-- zuul -->
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-zuul</artifactId>
           </dependency>
       </dependencies>
   </project>
    
   

3. 編寫 application.yml 配置路由及攔截
   Zuul 也需要註冊到 Eureka

   application.yml

   server:
     port: 9527
   
   # Spring 配置
   spring:
     application:
       name: spring-cloud-zuul
   
   # Eureka 配置
   eureka:
     client:
       service-url:
         defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
     instance:
       instance-id: www.zuul9527.com # 服務描述資訊
       prefer-ip-address: true # 顯示 ip 地址
   
   # 監控資訊
   info:
     app.name: kaishen-spring-cloud-zuul9527
   
   # Zuul 配置
   zuul:
     routes:
       mydept.serviceId: spring-cloud-provider-dept # 微服務名，對 9527 的訪問將會被路由到該服務
       mydept.path: /mydept/** # url 地址攔截
     ignored-services: spring-cloud-provider-dept # 忽略，即不能使用微服務名進行訪問 ("*" 表示隱藏所有微服務)
     prefix: /kaiye/ # 訪問字首
    
   

4. 編寫啟動類，開啟註解

   ZuulApplication9527

   package com.kaishen;
   
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
   
   /**
    * 路由閘道器啟動類
    * @author : toby
    * Create in 17:46 2022/5/9
    */
   @SpringBootApplication
   @EnableZuulProxy
   public class ZuulApplication9527 {
   
       public static void main(String[] args) {
           SpringApplication.run(ZuulApplication9527.class, args);
       }
   }
    
   

5. 訪問：
   在 C:\Windows\System32\drivers\etc\hosts 中配置主機對映，即可使用 http://www.kaishen.com:9527/kaiye/mydept/dept/get/1 訪問後端服務