[Spring Cloud] - Eureka 创建及使用

Eureka 分为Server及client
两者的配置均为3步

Eureka Server配置

1. 添加依赖

   <properties>
       <java.version>1.8</java.version>
       <spring-cloud.version>Hoxton.SR4</spring-cloud.version>
   </properties>
   <dependencies>
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
       </dependency>
   </dependencies>
   
   <dependencyManagement>
       <dependencies>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-dependencies</artifactId>
               <version>${spring-cloud.version}</version>
               <type>pom</type>
               <scope>import</scope>
           </dependency>
       </dependencies>
   </dependencyManagement>

2. appliction.yml中配置如下内容:

   server:
     port: 8761
   
   spring:
     application:
       name: eurekaServer
   eureka:
     instance:
       registerWithEureka: false
       fetchRegistry: false
     client:
       service-url:
         defaultZone: http://localhost:8761/eureka
       register-with-eureka: false
       fetch-registry: false

3. Main方法加@EnableEurekaServer

启动后,输入localhost:8761 即可看到Eruka的界面
注意： 不要输入localhost:8761/eureka

Eruka Client配置

1. 添加依赖

   <properties>
       <java.version>1.8</java.version>
       <spring-cloud.version>Hoxton.SR4</spring-cloud.version>
   </properties>
   
   <dependencies>
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
       </dependency>
   
   <dependencyManagement>
       <dependencies>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-dependencies</artifactId>
               <version>${spring-cloud.version}</version>
               <type>pom</type>
               <scope>import</scope>
           </dependency>
       </dependencies>
   </dependencyManagement>

2. 配置application.yml
   此处defaultZone即为eureka server的路径

   spring:
     application:
       name: eurekaclient
   eureka:
     client:
       serviceUrl:
         defaultZone: http://106.14.5.63:8761/eureka/

3. main方法加上@EnableEurekaClient

配置需验证登录的eureka server

Eureka server side:

1. 添加spring security依赖

   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-security</artifactId>
   </dependency>

2. application.yml中加入用户名密码

   spring:
     security:
       basic:
         enabled: true
       user:
         name: user
         password: password456

3. csrf配置
   新版本的Spring security添加了csrf，所以需要配置取消csrf， 否则会报如下的错误：

   Root name 'timestamp' does not match expected ('instance') for type [simple type, class com.netflix.appinfo.InstanceInfo]

   添加配置：

   @EnableWebSecurity
   @Configuration
   public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
   
   @Override
   protected void configure(HttpSecurity http) throws Exception {
       http.csrf().disable(); //关闭csrf
       http.authorizeRequests().anyRequest().authenticated().and().httpBasic(); //开启认证
   }

   Eureka Client side：
   application.yml中修改url即可：

   eureka:
     client:
    serviceUrl:
      defaultZone: http://user:password456@localhost:8761/eureka/

   重新运行即可。