spring boot config客户端无法使用bootstrap.properties从配置服务器加载配置

Question

Spring Boot 配置客户端无法从配置服务器加载配置。

bootstrap.properties

spring.application.name = eon-service
spring.cloud.config.uri=http://localhost:8888

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.7-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>microservice-eon-service</groupId>
    <artifactId>microservice-eon-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>microservice-eon-service</name>
    <description>Microservice project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2020.0.5-SNAPSHOT</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <releases>
                <enabled>false</enabled>
            </releases>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <releases>
                <enabled>false</enabled>
            </releases>
        </pluginRepository>
    </pluginRepositories>

</project>

错误：

• 连客户端都没有启动

  http://localhost:8080/

• 控制台错误：

---

应用程序启动失败

---

说明：

没有定义 spring.config.import 属性

行动：

将 spring.config.import=configserver: 属性添加到您的配置中。 如果不需要配置，请添加 spring.config.import=optional:configserver: 。 要禁用此检查，请设置 spring.cloud.config.enabled=false 或 spring.cloud.config.import-check.enabled=false。

Answer 1

花费太多时间后，我找到了两种解决此问题的方法 - 基本上我们必须将 spring.cloud.bootstrap.enabled 的值设为 true，默认为 false。 Spring Cloud doc 中已经提到了这一点，但我第一次没有明白这一点。找到这个问题的解决方法后，spring cloud doc的点已经清除了。

第一种方法：在@SpringBootApplicationclass中设置System环境变量

public static void main(String[] args) throws IOException {
     System.setProperty("spring.cloud.bootstrap.enabled","true");
     run(Application.class, args);
}

第二种方法：在 pom.xml 中的依赖项，它使 spring.cloud.bootstrap.enabled

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>

Answer 2

要使用传统的引导方式连接到 Config Server，必须通过属性或 spring-cloud-starter-bootstrap 启动器启用引导。该属性为 spring.cloud.bootstrap.enabled=true。它必须设置为系统属性或环境变量。 spring docs