1. Write a class to load and give access to properties:
package com.springtutorial.props;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class AppConfig {
@Value("${text.to.print}")
private String text;
public String getText() {
return text;
}
}
2. Here is your class that needs access to properties:
package com.springtutorial.props;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
@Component
public class App {
@Autowired
AppConfig appConfig;
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("application-context.xml");
AppConfig app = (AppConfig)ctx.getBean("appConfig");
System.out.println("Text : " + app.getText());
}
}
3. Here is what you need in ~/workspace/springtutorial/src/main/resources/application-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.springtutorial.props" />
<context:annotation-config />
<context:property-placeholder location="classpath:app.properties" />
</beans>
4. Your property file is ~/workspace/springtutorial/src/main/resources/app.properties
text.to.print=Hello World!
5. Finally, this is how you need set up your 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springtutorial</groupId>
<artifactId>props</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>props</name>
<url>http://maven.apache.org</url>
<properties>
<junit.version>4.10</junit.version>
<spring.version>3.0.6.RELEASE</spring.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
</project>
5. Time to run App.java as a Java Application to see the results.
