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  • (006)Spring Boot之配置文件中可以使用$引用变量

      springboot的配置文件中可以使用$引用变量,如下:

      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.edu.spring</groupId>
        <artifactId>springboot</artifactId>
        <version>1.0.0</version>
        <packaging>jar</packaging>
    
        <name>springboot</name>
        <!-- FIXME change it to the project's website -->
        <url>http://www.example.com</url>
        
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>2.1.6.RELEASE</version>
                    <scope>import</scope>
                    <type>pom</type>
                </dependency>
            </dependencies>
        </dependencyManagement>
        
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
        </dependencies>
    
    </project>
    View Code

      application.properties

    name=springboot
    app.name=this is ${name}
    View Code

      UserConfig.java

    package com.edu.spring.springboot;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.core.env.Environment;
    import org.springframework.stereotype.Component;
    
    @Component
    public class UserConfig {
    
        @Autowired
        private Environment environment;
        
        @Value("${name}")
        private String name;
        
        @Value("${app.name}")
        private String app_name;
        
        public void show(){
            System.out.println("name= "+environment.getProperty("name"));
            System.out.println("name= "+name);
            System.out.println("app.name= "+environment.getProperty("app.name"));
            System.out.println("app.name= "+app_name);
        }
    }
    View Code

      App.java

    package com.edu.spring.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ConfigurableApplicationContext;
    
    @SpringBootApplication
    public class App 
    {
        public static void main( String[] args )
        {
            
            ConfigurableApplicationContext context=SpringApplication.run(App.class, args);
            context.getBean(UserConfig.class).show();
            context.close();
        }
    }
    View Code

      运行结果如下:

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  • 原文地址:https://www.cnblogs.com/javasl/p/11827835.html
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