无法在 spring-boot 应用程序中从 Consul 读取配置
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【中文标题】无法在 spring-boot 应用程序中从 Consul 读取配置【英文标题】:Not able to read configuration from Consul in spring-boot application 【发布时间】:2018-05-13 23:05:32 【问题描述】:我正在创建一个Spring Boot
应用程序,它将从Consul
读取数据库属性等配置。但我无法使用我的应用程序从 Consul 读取键值。以下是我正在尝试做的事情。
**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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tuturself</groupId>
<artifactId>spring-boot-consul</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/>
</parent>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.retry.version>1.2.1.RELEASE</spring.retry.version>
<consul.version>1.1.2.RELEASE</consul.version>
<consul.discovery.version>1.1.2.RELEASE</consul.discovery.version>
<jackson.version>2.8.1</jackson.version>
</properties>
<dependencies>
<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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-all</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-consul-discovery</artifactId>
<version>$consul.discovery.version</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
<version>$spring.retry.version</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>$jackson.version</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>$jackson.version</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-consul-dependencies</artifactId>
<version>1.2.1.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
以下是我的主要课程:
@EnableRetry
@RefreshScope
@EnableDiscoveryClient
@SpringBootApplication
@ComponentScan("com.test.*")
public class SpringBootConsulApplication
private static ConsulConfiguration consulConfiguration;
public static void main(String[] args)
try
String consulHost = System.getProperty("spring.cloud.consul.host");
System.out.println("consulHost ::" + consulHost);
String consulPort = System.getProperty("spring.cloud.consul.port");
System.out.println("consulPort ::" + consulPort);
String consulPrefix = System.getProperty("spring.cloud.consul.config.prefix");
System.out.println("consulPrefix ::" + consulPrefix);
new SpringApplicationBuilder(SpringBootConsulApplication.class).web(true).run(args);
catch (Exception ex)
ex.printStackTrace();
我正在使用@Value
注释读取领事属性:
@Configuration
@EnableConfigurationProperties(PropertySourceBootstrapProperties.class)
public class ConsulConfiguration
@Value("$cassandra.host")
private String cassandraHost;
@Value("$cassandra.user")
private String userName;
@Value("$cassandra.password")
private String password;
我的 bootstrap.yml
在资源文件夹中:
spring:
cloud:
consul:
host: localhost
port: 8500
enabled: true
config:
enabled: true
prefix: config/application
defaultContext: apps
profileSeparator: '::'
application:
name: spring-boot-consul
Consul 在我的本地系统 localhost:8500
上启动并运行,我有文件 config/application/spring-boot-consul.yml
文件;
spring:
application:
name: spring-boot-consul
cassandra:
host: 127.0.0.1:9042,127.0.0.2:9042
user: my_user
password: my_pass
pooling:
maxThread: 10
timeout: 50
keyspace:
name: test_keyspace
readConsistency: ONE
writeConsistency: ONE
当我对应用程序进行分层时,它显示无法在我的 ConsulConfiguration
类中绑定 cassandra.host
。从而停止应用程序。任何提示,我在这里做错了什么?
【问题讨论】:
您是否尝试按照文档在 bootstrap.yml 文件中设置 spring.cloud.consul.config.format? 你可以通过从配置类中删除注释来检查@EnableConfigurationProperties(PropertySourceBootstrapProperties.class) 你是如何开始你的领事代理的? 【参考方案1】:您可以找到一个工作示例here。
Consul 配置 KV 存储
您需要通过 Consul UI 或命令行将属性存储在 Consul KV 存储中。 Consul Agent 不会从文件系统加载您的属性。要从命令行加载属性,您可以在 Consul Agent 启动并运行后使用以下命令。可以通过在文件名前加上 @ 符号来从文件中读取 YAML 数据。
./consul kv put config/application/data @spring-boot-consul.yml
其中config/application/data
是键名。
如果数据成功写入KV,应该会得到如下响应,
Success! Data written to: config/application/data
您还可以使用以下命令从 KV 中获取属性,
$ ./consul kv get config/application/data
cassandra:
host: 127.0.0.1:9042,127.0.0.2:9042
user: my_user
password: my_pass
您还可以从 Consul Web UI 查看属性,
对 bootstrap.yml 的更改
您需要稍微修改您的bootstrap.yml
。以下是更改:
prefix
值为 config
defaultContext
值为application
将format
添加到yaml
以data
的名称添加data-key
以获取YAML blob。
spring:
profiles: default
cloud:
consul:
host: localhost
port: 8500
config:
enabled: true
prefix: config
defaultContext: application
data-key: data
profileSeparator: '::'
format: yaml
application:
name: spring-boot-consul
对 ConsulConfiguration 的更改
@Configuration
@RefreshScope
public class ConsulConfiguration
@Value("$cassandra.host")
private String cassandraHost;
@Value("$cassandra.user")
private String userName;
@Value("$cassandra.password")
private String password;
@PostConstruct
public void postConstruct()
// to validate if properties are loaded
System.out.println("** cassandra.host: " + cassandraHost);
System.out.println("** cassandra.user: " + userName);
System.out.println("** cassandra.password: " + password);
对应用程序类的更改,
@EnableRetry
@RefreshScope
@EnableDiscoveryClient
@EnableAutoConfiguration
@EnableConfigurationProperties
@SpringBootApplication
@ComponentScan("com.test.*")
public class SpringBootConsulApplication
public static void main(String[] args)
...
【讨论】:
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