search
HomeJavajavaTutorialHow does SpringBoot read YML, yaml, and properties files?

yml,yaml,properties三种文件都是用来存放配置的文件,一些静态数据,配置的数据都会存放到里边。但是有的时候我们不仅仅需要存储静态数据,还需要从文件中读取数据出来。这三种文件都放在项目--》src--》main--》resource下边。如果resource里边需要存放其他文件的话,会在resource里边创建一个config包。将配置文件存放其中。

How does SpringBoot read YML, yaml, and properties files?

1.在项目中新建配置文件,文件存放地址

bootstrap.yml是SpringBoot程序的一个配置文件,在项目启动前就会被加载,将数据加载后,方便后续使用。一般放置一些关键性的数据:数据库连接数据,Redis消息队列配置数据,Hikari 连接池配置、mybatis-plus配置信息、日志信息等。

How does SpringBoot read YML, yaml, and properties files?

配置文件写好后,需要加入下边这一段配置,激活配置文件。指定激活配置文件,可以用于不同环境激活不同的配置文件。

#启动配置文件(开发、生成)
profiles:
  active: dev

2.配置文件中写入相关配置

除了放置必要的配置,还可以放置一些系统中,静态化的数据,可以写入配置文件中,在读取出来使用。

global:
  upload:
    maxSize: 100MB
    location: /var/uploads

属性后边需要空一格在写,不然会报错

3.创建一个类来接收这些配置

接收这些配置到文件,将配置文件中的属性值自动注入到Java类中,避免手写的麻烦,使用注释解放了双手,很好的接收文件。

@Data
@Component
@ConfigurationProperties(prefix = "global.upload")
public class UploadProperties {
    private String location;
    private String maxSize;
}
  • @ConfigurationProperties 是 Spring Boot 中用于从配置文件读取配置属性的注解。

  • 当你使用 @ConfigurationProperties(prefix = "global.upload")注解的时候,你可以读取配置文件中以 "global.upload" 为前缀的属性,并将这些属性映射到一个 Java Bean 中。

  • 使用 @ConfigurationProperties 注解可以更方便地读取多个属性,并且可以使用内置的验证和转换功能。

4.举例获取并且使用配置文件里边的数据

@Service
public class FileServiceImpl implements FileService {

    @Autowired
    private UploadProperties uploadProperties ;
    @Override
    public String uploadFile(MultipartFile file) throws Exception {
    		String fileUrl=null;
            if (!( uploadProperties.getLocation() ==null)) {
                  fileUrl =  uploadProperties.getLocation().replace("/", File.separator) + fileAdd + File.separator + System.currentTimeMillis() + "." +uploadProperties.getMaxSize();
            }else {
                  fileUrl = "D:\\uploadFiles\\report\\" + fileAdd + File.separator + System.currentTimeMillis() + "." + uploadProperties.getMaxSize();
            }
	}
}

这一个例子中,Spring的@Service注解标注的服务类,其中实现了一个文件上传的方法uploadFile,具体功能是将上传的MultipartFile类型的文件保存到指定的位置,然后返回文件的访问地址。

在该类中通过@Autowired注解将UploadProperties类型的Bean注入进来,UploadProperties包含了文件上传相关的配置信息,例如文件上传保存的位置、最大文件大小等。

在uploadFile方法中,首先判断上传文件的保存位置是否为空,如果不为空,则将文件保存到指定位置,否则将文件保存到默认位置。文件保存的位置是由uploadProperties.getLocation()和fileAdd拼接而成,其中fileAdd是一个自定义的子目录名称,用于区分不同的上传场景。

最后,根据保存的文件名和位置拼接成文件的访问地址,并将其返回。

The above is the detailed content of How does SpringBoot read YML, yaml, and properties files?. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:亿速云. If there is any infringement, please contact admin@php.cn delete
What aspects of Java development are platform-dependent?What aspects of Java development are platform-dependent?Apr 26, 2025 am 12:19 AM

Javadevelopmentisnotentirelyplatform-independentduetoseveralfactors.1)JVMvariationsaffectperformanceandbehavioracrossdifferentOS.2)NativelibrariesviaJNIintroduceplatform-specificissues.3)Filepathsandsystempropertiesdifferbetweenplatforms.4)GUIapplica

Are there performance differences when running Java code on different platforms? Why?Are there performance differences when running Java code on different platforms? Why?Apr 26, 2025 am 12:15 AM

Java code will have performance differences when running on different platforms. 1) The implementation and optimization strategies of JVM are different, such as OracleJDK and OpenJDK. 2) The characteristics of the operating system, such as memory management and thread scheduling, will also affect performance. 3) Performance can be improved by selecting the appropriate JVM, adjusting JVM parameters and code optimization.

What are some limitations of Java's platform independence?What are some limitations of Java's platform independence?Apr 26, 2025 am 12:10 AM

Java'splatformindependencehaslimitationsincludingperformanceoverhead,versioncompatibilityissues,challengeswithnativelibraryintegration,platform-specificfeatures,andJVMinstallation/maintenance.Thesefactorscomplicatethe"writeonce,runanywhere"

Explain the difference between platform independence and cross-platform development.Explain the difference between platform independence and cross-platform development.Apr 26, 2025 am 12:08 AM

Platformindependenceallowsprogramstorunonanyplatformwithoutmodification,whilecross-platformdevelopmentrequiressomeplatform-specificadjustments.Platformindependence,exemplifiedbyJava,enablesuniversalexecutionbutmaycompromiseperformance.Cross-platformd

How does Just-In-Time (JIT) compilation affect Java's performance and platform independence?How does Just-In-Time (JIT) compilation affect Java's performance and platform independence?Apr 26, 2025 am 12:02 AM

JITcompilationinJavaenhancesperformancewhilemaintainingplatformindependence.1)Itdynamicallytranslatesbytecodeintonativemachinecodeatruntime,optimizingfrequentlyusedcode.2)TheJVMremainsplatform-independent,allowingthesameJavaapplicationtorunondifferen

Why is Java a popular choice for developing cross-platform desktop applications?Why is Java a popular choice for developing cross-platform desktop applications?Apr 25, 2025 am 12:23 AM

Javaispopularforcross-platformdesktopapplicationsduetoits"WriteOnce,RunAnywhere"philosophy.1)ItusesbytecodethatrunsonanyJVM-equippedplatform.2)LibrarieslikeSwingandJavaFXhelpcreatenative-lookingUIs.3)Itsextensivestandardlibrarysupportscompr

Discuss situations where writing platform-specific code in Java might be necessary.Discuss situations where writing platform-specific code in Java might be necessary.Apr 25, 2025 am 12:22 AM

Reasons for writing platform-specific code in Java include access to specific operating system features, interacting with specific hardware, and optimizing performance. 1) Use JNA or JNI to access the Windows registry; 2) Interact with Linux-specific hardware drivers through JNI; 3) Use Metal to optimize gaming performance on macOS through JNI. Nevertheless, writing platform-specific code can affect the portability of the code, increase complexity, and potentially pose performance overhead and security risks.

What are the future trends in Java development that relate to platform independence?What are the future trends in Java development that relate to platform independence?Apr 25, 2025 am 12:12 AM

Java will further enhance platform independence through cloud-native applications, multi-platform deployment and cross-language interoperability. 1) Cloud native applications will use GraalVM and Quarkus to increase startup speed. 2) Java will be extended to embedded devices, mobile devices and quantum computers. 3) Through GraalVM, Java will seamlessly integrate with languages ​​such as Python and JavaScript to enhance cross-language interoperability.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.