Question

我正在创建一个Spring Boot应用程序，它将从Consul读取类似数据库属性的配置。但是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注释阅读领事属性：

@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;
}

我在资源文件夹中有bootstrap.yml：

spring:
  cloud:
    consul:
      host: localhost
      port: 8500
      enabled: true
      config:
        enabled: true
        prefix: config/application
        defaultContext: apps
        profileSeparator: '::'
  application:
    name: spring-boot-consul

Consul已在localhost:8500的本地系统中启动并运行，其中我有文件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

当我查看应用程序时，它显示无法绑定cassandra.host类中的ConsulConfiguration。从而停止申请。任何提示，我在这里做错了什么？

Answer 1

您可以找到一个有效的例子here。

Consul配置KV商店

您需要从Consul UI或命令行将您的属性存储在Consul KV商店中。 Consul Agent不会从文件系统加载您的属性。要从命令行加载属性，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添加@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是关键名称。

如果数据已成功写入KV，您应该得到以下回复，

Success! Data written to: config/application/data

您还可以使用以下命令

从KV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

您需要略微修改bootstrap.yml。以下是更改：

prefix值为config
defaultContext值为application
将format添加到yaml

添加data-key名称data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Application类的更改，

@EnableRetry
@RefreshScope
@EnableDiscoveryClient
@EnableAutoConfiguration
@EnableConfigurationProperties
@SpringBootApplication
@ComponentScan("com.test.*")
public class SpringBootConsulApplication {

    public static void main(String[] args) {
        ...
    }

}

无法在spring-boot应用程序中从Consul读取配置

1 个答案:

Consul配置KV商店

对bootstrap.yml的更改

对ConsulConfiguration的更改

对Application类的更改，