从 Spring Cloud 配置服务器中读取配置属性
该指南阐述了你的Quarkus应用程序如何在运行时从 Spring Cloud Config Server 中读取配置属性。
先决条件
完成这个指南，你需要:
-
大概15分钟
-
编辑器
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JDK 17+ installed with
JAVA_HOMEconfigured appropriately -
Apache Maven 3.9.8
-
如果你愿意的话，还可以选择使用Quarkus CLI
-
如果你想构建原生可执行程序，可以选择安装Mandrel或者GraalVM，并正确配置(或者使用Docker在容器中进行构建)
建立一个配置服务器
建立该指南所需的 配置服务器 (Config Server)，请遵循 这里 的说明。该过程的最终目的是创建一个正在运行的且应用程序查询名为 a-bootiful-client 的服务器时，会为名为 message 的配置属性提供值为 Hello world 的配置服务器。
创建Maven项目
首先，我们需要一个新的项目。使用以下命令创建一个新项目:
For Windows users:
-
If using cmd, (don’t use backward slash
\and put everything on the same line) -
If using Powershell, wrap
-Dparameters in double quotes e.g."-DprojectArtifactId=spring-cloud-config-quickstart"
该命令生成了一个已导入 spring-cloud-config-client 扩展的项目。
如果你已经配置了你的Quarkus项目，你可以通过在你的项目根目录下运行以下命令，将 spring-cloud-config-client 扩展添加到你的项目中:
quarkus extension add spring-cloud-config-client./mvnw quarkus:add-extension -Dextensions='spring-cloud-config-client'./gradlew addExtension --extensions='spring-cloud-config-client'这会在你的构建文件中添加以下内容:
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-spring-cloud-config-client</artifactId>
</dependency>implementation("io.quarkus:quarkus-spring-cloud-config-client")GreetingController
First, create a simple GreetingResource Jakarta REST resource in the
src/main/java/org/acme/spring/cloud/config/client/GreetingResource.java file that looks like:
package org.acme.spring.spring.cloud.config.client;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
@Path("/hello")
public class GreetingResource {
@GET
@Produces(MediaType.TEXT_PLAIN)
public String hello() {
return "hello";
}
}由于我们想使用从配置服务器(Config Server)中获取到的配置属性，我们将更新 GreetingResource 以注入 message 属性。更新后的代码将如下所示:
package org.acme.spring.spring.cloud.config.client;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import org.eclipse.microprofile.config.inject.ConfigProperty;
@Path("/hello")
public class GreetingResource {
@ConfigProperty(name = "message", defaultValue="hello default")
String message;
@GET
@Produces(MediaType.TEXT_PLAIN)
public String hello() {
return message;
}
}配置该应用程序
Quarkus在 quarkus.spring-cloud-config 根路径下提供了多种配置选项。就该指南而言，我们的Quarkus应用程序将在 application.properties 中配置以下内容:
# use the same name as the application name that was configured when standing up the Config Server
quarkus.application.name=a-bootiful-client
# enable retrieval of configuration from the Config Server - this is off by default
quarkus.spring-cloud-config.enabled=true
# configure the URL where the Config Server listens to HTTP requests - this could have been left out since http://localhost:8888 is the default
quarkus.spring-cloud-config.url=http://localhost:8888|
If you are using Gradle, the Gradle setting |
打包并运行该应用程序
使用以下命令运行该应用程序:
quarkus dev./mvnw quarkus:dev./gradlew --console=plain quarkusDev打开你的浏览器并访问 http://localhost:8080/greeting。
结果应该是： Hello world ，因为这是从Spring Cloud 配置服务器(Config Server)上获取的值。
以本地可执行文件的方式运行该应用程序
当然，你也可以使用 构建本地可执行文件指南 的说明来创建一个本地镜像。
Spring Cloud 配置客户端参考
Configuration property fixed at build time - All other configuration properties are overridable at runtime
类型 |
默认 |
|
|---|---|---|
If enabled, will try to read the configuration from a Spring Cloud Config Server Environment variable: Show more |
boolean |
|
If set to true, the application will not stand up if it cannot obtain configuration from the Config Server Environment variable: Show more |
boolean |
|
The Base URI where the Spring Cloud Config Server is available Environment variable: Show more |
string |
|
Name of the application on Spring Cloud Config server. Could be a list of names to load multiple files (value separated by a comma) Environment variable: Show more |
string |
|
The label to be used to pull remote configuration properties. The default is set on the Spring Cloud Config Server (generally "master" when the server uses a Git backend). Environment variable: Show more |
string |
|
The amount of time to wait when initially establishing a connection before giving up and timing out. Specify Environment variable: Show more |
|
|
The amount of time to wait for a read on a socket before an exception is thrown. Specify Environment variable: Show more |
|
|
The username to be used if the Config Server has BASIC Auth enabled Environment variable: Show more |
string |
|
The password to be used if the Config Server has BASIC Auth enabled Environment variable: Show more |
string |
|
TrustStore to be used containing the SSL certificate used by the Config server Can be either a classpath resource or a file system path Environment variable: Show more |
path |
|
Password of TrustStore to be used containing the SSL certificate used by the Config server Environment variable: Show more |
string |
|
KeyStore to be used containing the SSL certificate for authentication with the Config server Can be either a classpath resource or a file system path Environment variable: Show more |
path |
|
Password of KeyStore to be used containing the SSL certificate for authentication with the Config server Environment variable: Show more |
string |
|
Password to recover key from KeyStore for SSL client authentication with the Config server If no value is provided, the key-store-password will be used Environment variable: Show more |
string |
|
When using HTTPS and no keyStore has been specified, whether to trust all certificates Environment variable: Show more |
boolean |
|
The profiles to use for lookup Environment variable: Show more |
list of string |
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Custom headers to pass the Spring Cloud Config Server when performing the HTTP request Environment variable: Show more |
|
About the Duration format
To write duration values, use the standard You can also use a simplified format, starting with a number:
In other cases, the simplified format is translated to the
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