spring cloud项目升级spring boot 2.0爬过的坑

注：升级后spring boot为2.0版本，spring cloud为Finchley.M8版本。
2.0官方文档地址：https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/
gitee项目地址:https://gitee.com/lwydyby/springcloud-adplatform

升级时，官方建议引进的依赖（可以提示配置的改动）：

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-properties-migrator</artifactId>

</dependency>

一.Eureka

1. 依赖修改为：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

1. 如果引用了actuator,actuator的默认路径有ip:port/info等改为IP:port/actuator/info，以此类推
2. 如需使用spring boot admin监控项目，则需增加如下配置：

eureka:
  instance:
    hostname: localhost
    metadata-map:
          user.name: admin
          user.password: admin
    health-check-url-path: /actuator/health
    home-page-url-path: /actuator
    status-page-url-path: /actuator/info
  client:
    registerWithEureka: false
    fetchRegistry: false

二.gateway
1. 需要修改的依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

1. spring boot 2.0中actuator默认只公开info和health接口，如果需要获取更多信息，则需增加如下配置：

management.endpoints.web.exposure.include: "*"

三.monitor
1. 目前spring boot admin作者发布了2.0 测试版，详情见：https://github.com/codecentric/spring-boot-admin
2. 2.0的界面展示：

3. spring boot admin需要增加的依赖：

<properties>
        <hystrix.version>1.5.12</hystrix.version>
        <boot.admin.version>2.0.0-SNAPSHOT</boot.admin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-server</artifactId>
            <version>2.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jolokia</groupId>
            <artifactId>jolokia-core</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>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <repositories>
    <repository>
        <id>sonatype-nexus-staging</id>
        <url>https://oss.sonatype.org/content/groups/public/</url>
    </repository>
    </repositories>

注：这里只提供依赖，2.0的配置也需要调整，有时间再单独写一篇，需要的话可参考官方文档：
https://codecentric.github.io/spring-boot-admin/current/
4. 2.0取消了manage.sleuth.enable配置
四.zipkin
1. 由于spring boot 2.0将UndertowEmbeddedServletContainerFactory替换掉了，zipkin暂时还未更新到spring boot 2.0 版本

2. zipkin服务端也没必要使用spring boot2.0，继续使用1.5.x即可
3. zipkin的客户端如果升级为了2.0，则需更改如下依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zipkin</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-stream-binder-kafka</artifactId>
</dependency>

注：我这里使用的kafka作为中间件，进行的存储。根据作者gitter上的留言，目前kafka还是使用的spring kafka的统一配置，如需单独配置,需要自己编写config类即可。
sleuth官方文档地址：https://cloud.spring.io/spring-cloud-static/spring-cloud-sleuth/2.0.0.M5/single/spring-cloud-sleuth.html

最后推荐几个学习spring boot的网站：
1. http://springboot.fun/ Spring中文导航
2. https://www.ibm.com/developerworks/cn/java/j-cn-with-reactor-response-encode/index.html spring5 响应式编程
3. https://spring.io/projects spring官方网站（没办法，最新文档只有英文的）
4. https://www.ibm.com/developerworks/cn/java/spring5-webflux-reactive/index.html 使用 Spring 5 的 WebFlux 开发反应式 Web 应用