스프링에서 프로퍼티(Properety) 파일 다루기, @PropertySource, @Value

 http://ojc.asia/bbs/board.php?bo_table=LecSpring&wr_id=860

 

스프링에서 프로퍼티(Properety) 파일 다루기, @PropertySource, @Value

 

1. @PropertySource로 자바설정에서 프로퍼티 파일 다루기

@PropertySource는

-      Spring의 환경(Environment)에 프로퍼티 파일의 속성을 주입하며,

-      @Value를 통해 속성을 클래스 속성에 주입 할 수 있다.

[db1.properties]

jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl

 

[Config.java]

@Configuration

// 자바8이상에서는 @PropertySource 여러 개 사용가능

@PropertySource(“classpath:db1.properties”)

@PropertySource(“classpath:db2.properties”)

// @PropertySources는 @PropertySource를 배열형태로 가진다.

@PropertySources({

   @PropertySource(“classpath:db3.properties”),

   @PropertySource(“classpath:db4.properties”)

})

public class Config {

 

    @Autowired

    private Environment env;

 

    @Value(“${jdbc.url}”)

    private String url;

 

// DB연결을 위한 데이터소스 정의

@Bean

    public DataSource dataSource() {

        final DriverManagerDataSource dataSource = new DriverManagerDataSource();

       

        dataSource.setUrl(env.getProperty("jdbc.url"));

dataSource.setUrl( url );

        ……

        return dataSource;

    }}

 

2. XML 파일에서 Property File 다루기

 

[스프링 설정파일]

// @PropertySource를 대신한 XML 설정

// 아래의 경우 자바설정(@Configuration)등에서 

// Environment API를 사용할 수 없다.

<context:property-placeholder 

location="classpath:db1.properties" /> 

 

<context:property-placeholder 

location="classpath:db1.properties,

classpath:db2.properties" />

 

<bean id="dataSource">

    <property name="url" value="${jdbc.url}" />

</bean>

 

3. 실습

File >> new >> project >> maven >> maven project

 

[pom.xml]

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

      <modelVersion>4.0.0</modelVersion>

      <groupId>demo1</groupId>

      <artifactId>demo1</artifactId>

      <version>0.0.1-SNAPSHOT</version>

      <name>demo1</name>

      <description>demo1</description>

      <properties>

            <spring-version>5.2.3.RELEASE</spring-version>

      </properties>

 

      <dependencies>

 

            <dependency>

                  <groupId>ch.qos.logback</groupId>

                  <artifactId>logback-classic</artifactId>

                  <version>1.2.3</version>

            </dependency>

 

            <dependency>

                  <groupId>org.springframework</groupId>

                  <artifactId>spring-context</artifactId>

                  <version>${spring-version}</version>

            </dependency>

 

            <dependency>

                  <groupId>org.springframework</groupId>

                  <artifactId>spring-core</artifactId>

                  <version>${spring-version}</version>

            </dependency>

 

      </dependencies>

 

</project

 

[src/main/resources/application.properties]

# application.properties

app.name=Property Test Program

 

[AppConfig.java]

package demo1;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

 

// @PropertySource는 application.properties의 속성을 Spring의 환경에 주입.

@Configuration

@PropertySource(value = "application.properties", ignoreResourceNotFound = true)

public class AppConfig { }

 

[AppMain.java]

package demo1;

 

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.core.env.Environment;

 

@ComponentScan(basePackages = "demo1")

public class AppMain {

 

    private static final Logger logger = LoggerFactory.getLogger(AppMain.class);

 

    // Spring 환경(Environment)을 주입

    // env.getProperty()를 통해 속성값에 접근

    @Autowired

    private Environment env;

 

    // @Value를 통해 application.properties의 속성값에 접근.

    @Value("${app.name}")

    private String appName;

 

    public static void main(String[] args) {

 

      AnnotationConfigApplicationContext ctx =

                      new AnnotationConfigApplicationContext(AppMain.class);

        AppMain app = ctx.getBean(AppMain.class);

 

        app.run();

 

        ctx.close();

    }

 

    private void run() {

       logger.info("From Environment");

        logger.info("app.name : {}", env.getProperty("app.name"));

 

        logger.info("Using @Value injection");

        logger.info("app.name : {}", appName);

    }

}

 

[결과]

16:27:03.487 [main] INFO demo1.AppMain - From Environment

16:27:03.488 [main] INFO demo1.AppMain - app.name : Property Test Program

16:27:03.489 [main] INFO demo1.AppMain - Using @Value injection

16:27:03.489 [main] INFO demo1.AppMain - app.name : Property Test Program

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