如何在Spring Boot中将application.properties转换为application.yml？

Question

我有一个非常简单的Spring Boot应用程序，并且有application.properties，现在我想移至application.yml

这是application.yml文件：

spring:
    datasource:
        url: jdbc:mysql://localhost:3306/employee_directory
        username: student
        password: Password123

因此，我已经删除了application.properties文件，并且已经编写了application.yml文件。如果我运行该应用程序，则会出现以下异常：

   20:31:22.446 [restartedMain] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml'
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:524)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:473)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:443)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$6(ConfigFileApplicationListener.java:425)
    at java.lang.Iterable.forEach(Iterable.java:75)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$7(ConfigFileApplicationListener.java:425)
    at java.lang.Iterable.forEach(Iterable.java:75)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:422)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:321)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:202)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:186)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:176)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:164)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:340)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:304)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202)
    at com.dgs.springboot.SpringBootRESTJPA.SpringBootRestJPAApplication.main(SpringBootRestJPAApplication.java:10)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.yaml.snakeyaml.scanner.ScannerException: while scanning for the next token
found character '\t(TAB)' that cannot start any token. (Do not use \t(TAB) for indentation)
 in 'reader', line 2, column 1:
        datasource:
    ^

    at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:419)
    at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)
    at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:586)
    at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
    at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:148)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:124)
    at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:236)
    at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:227)
    at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:215)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:144)
    at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:85)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:123)
    at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:547)
    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:160)
    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:134)
    at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:75)
    at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:49)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadDocuments(ConfigFileApplicationListener.java:542)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:497)
    ... 28 common frames omitted

我想我需要对我的代码进行其他修改才能使用此application.yml文件，但我不知道该怎么办？

这是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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dgs.springboot</groupId>
    <artifactId>SpringBootRESTHibernate</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>SpringBootRESTHibernate</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <!-- Add work around for Eclipse bug -->
        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!-- This is used for packaging and running our app -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

任何反馈将不胜感激。谢谢！

Answer 1

您可以使用命令行工具props2yaml进行从属性到yaml的通用自动（正确）转换。

Answer 2

由于“：”，我认为您的2019-08-08 07:35:14,619 ERROR [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) WFLYDS0012: Scan of /opt/wildfly-14.0.1.Final/standalone/deployments threw Exception: java.lang.RuntimeException: WFLYDS0032: Failed to list files in directory /opt/wildfly-14.0.1.Final/standalone/deployments. Check that the contents of the directory are readable. at org.jboss.as.deployment-scanner@6.0.2.Final//org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.listDirectoryChildren(FileSystemDeploymentService.java:1365) at org.jboss.as.deployment-scanner@6.0.2.Final//org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.scanDirectory(FileSystemDeploymentService.java:846) at org.jboss.as.deployment-scanner@6.0.2.Final//org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.scan(FileSystemDeploymentService.java:598) at org.jboss.as.deployment-scanner@6.0.2.Final//org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.scan(FileSystemDeploymentService.java:493) at org.jboss.as.deployment-scanner@6.0.2.Final//org.jboss.as.server.deployment.scanner.FileSystemDeploymentService$DeploymentScanRunnable.run(FileSystemDeploymentService.java:255) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) at org.jboss.threads@2.3.2.Final//org.jboss.threads.JBossThread.run(JBossThread.java:485) Caused by: java.nio.file.FileSystemException: /opt/wildfly-14.0.1.Final/standalone/deployments: Too many open files at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:100) at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111) at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116) at java.base/sun.nio.fs.UnixFileSystemProvider.newDirectoryStream(UnixFileSystemProvider.java:428) at java.base/java.nio.file.Files.newDirectoryStream(Files.java:603) at org.jboss.as.deployment-scanner@6.0.2.Final//org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.listDirectoryChildren(FileSystemDeploymentService.java:1358) ... 11 more 2019-08-08 07:55:11,261 INFO [org.jboss.as.server] (Thread-1) WFLYSRV0236: Suspending server with no timeout. 2019-08-08 07:55:11,272 INFO [org.jboss.as.ejb3] (Thread-1) WFLYEJB0493: EJB subsystem suspension complete 2019-08-08 07:55:11,285 INFO [org.jboss.as.server] (Thread-1) WFLYSRV0220: Server shutdown has been requested via an OS signal 2019-08-08 07:55:11,324 INFO [org.jboss.as.mail.extension] (MSC service thread 1-8) WFLYMAIL0002: Unbound mail session [java:jboss/mail/Default] 2019-08-08 07:55:11,327 INFO [org.wildfly.extension.undertow] (ServerService Thread Pool -- 72) WFLYUT0022: Unregistered web context: '/service' from server 'default-server' 值必须用引号引起来。试试这个：

datasource.url

此外，如上所述，您应该使用空格进行缩进；通常，每个级别两个空格。

祝你好运！

Answer 3

检查是否使用制表符进行缩进。 YAML spec不允许这样做：

  

为保持可移植性，不得在缩进中使用制表符，因为不同的系统对待制表符的方式有所不同。请注意，大多数现代编辑器都可以配置为按Tab键可插入适当数量的空格。

Answer 4

如果使用Eclipse或STS，则在.properties文件中使用非常简单的打开上下文菜单，然后选择“转换为Yaml文件”。该文件将被自动转换。如果上下文菜单上没有此功能，则需要从“帮助”菜单-> Eclipse市场上安装Yaml插件。

Answer 5

对于其他寻求类似答案的人，在IntelliJ中运行的Spring项目中，它的工作原理只是将application.properties的扩展名更改为application.yml。就我而言，该文件为空，因此我无需更改任何内容，可以适当地使用application.yml。

Answer 6

这只是一个额外的答案，可能会帮助其他开发者。

我找到了一个更好、更简单的工具来将属性文件转换为 YML 文件。 convert from properties to yml

您必须上传您的 .properties 文件，然后选择 To YML 文件选项，它将生成一个非常好的 yml 文件。 该工具还支持许多其他格式，例如 Yml 到 XML、Yml 到属性、CSV、JSON 等。

Answer 7

我构建了一个在线转换工具 (http://env.simplestep.ca/)，可以在 spring boot yaml、属性和环境变量之间进行转换——使用 spring boot's relaxed binding rules