10.Springcloud的Zuul

示例代码：

github地址

Springcloud的Zuul概述

Zuul包含了对请求的路由和过滤两个最主要的功能：
其中路由功能负责将外部请求转发到具体的微服务实例上，是实现外部访问统一入口的基础。
而过滤器功能则负责对请求的处理过程进行干预，是实现请求校验、服务聚合等功能的基础.Zuul和Eureka进行整合，将Zuul自身注册为Eureka服务治理下的应用，同时从Eureka中获得其他微服务的消息，也即以后的访问微服务都是通过Zuul跳转后获得。

注意：Zuul服务最终还是会注册进Eureka

提供=代理+路由+过滤三大功能

实现步骤

1.新建zuul的module，命名为：debugggcloud_zuul_gateway_9527

2.pom.xml内容:

<?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>debugggcloud</artifactId>
        <groupId>com.deubggg</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>debugggcloud_zuul_gateway_9527</artifactId>

    <dependencies>
        <!-- zuul路由网关 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <!-- actuator监控 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--  hystrix容错-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <!-- 日常标配 -->
        <dependency><!-- 引入自己定义的api通用包，可以使用Dept部门Entity -->
            <artifactId>debugggcloud_api</artifactId>
            <groupId>com.deubggg</groupId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
    </dependencies>
</project>

3.启动类的代码，添加了注解：@EnableZuulProxy

package com.debuggg.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableZuulProxy
public class ZuulGateway9527 {
    public static void main(String[] args) {
        SpringApplication.run(ZuulGateway9527.class,args);
    }
}

4.yml的代码

server:
  port: 9527

spring:
  application:
    name: microservicecloud-zuul-gateway

eureka:
  client:
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka,http://eureka7003.com:7003/eureka
  instance:
    instance-id: gateway-9527.com
    prefer-ip-address: true


info:
  app.name: atguigu-microcloud
  company.name: www.atguigu.com
  build.artifactId: ${project.artifactId}
  build.version: ${project.version}


zuul:
  routes:
    dept.serviceId: debugggcloud-dept
    dept.path: /mydept/**
  ignored-services: "*"
  prefix: /debuggg

5.zuul的参数解释：

zuul.routes.dept.serviceId=debugggcloud-dept
zuul.routes.dept.path= /mydept/**
以上两个参数是对注册进eureka中的服务debugggcloud-dept进行映射到mydept路径

zuul.ignored-services="*"，忽略所有的通过服务名调用方式路径

zuul.prefix=/debuggg ，给路径加上前缀debuggg