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How to read property file in spring 3.0 using java based configuration?


In the previous example you have seen How to read property file in spring using xml based configuration file?. In this example, you can see how to load property using java configuration:

package com.java2novice.beans;

public class MyDbConfig {

	private String dbHost;
	private String dbPort;
	private String dbService;
	private String dbUrl;
	private String dbPassword;
	
	public String getDbHost() {
		return dbHost;
	}
	public void setDbHost(String dbHost) {
		this.dbHost = dbHost;
	}
	public String getDbPort() {
		return dbPort;
	}
	public void setDbPort(String dbPort) {
		this.dbPort = dbPort;
	}
	public String getDbService() {
		return dbService;
	}
	public void setDbService(String dbService) {
		this.dbService = dbService;
	}
	public String getDbUrl() {
		return dbUrl;
	}
	public void setDbUrl(String dbUrl) {
		this.dbUrl = dbUrl;
	}
	public String getDbPassword() {
		return dbPassword;
	}
	public void setDbPassword(String dbPassword) {
		this.dbPassword = dbPassword;
	}
	
	@Override
	public String toString(){
		return dbHost+"|"+dbPort+"|"+dbService+"|"+dbUrl+"|"+dbPassword;
	}
}

db.properties file:

db.host.url=db.java2novice.com
db.port.number=1521
db.service.name=test_db
db.user=java2novice
db.password=testme!*

Java based configuration:

package com.java2novice.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;

import com.java2novice.bean.MyDbConfig;

@Configuration
@PropertySource("classpath:/db.properties")
public class MyApplicationConfig {

	@Autowired
    Environment env;
	
	@Bean(name="dbConfig")
	public MyDbConfig getDbConfig(){
		
		MyDbConfig dbConf = new MyDbConfig();
		dbConf.setDbHost(env.getProperty("db.host.url"));
		dbConf.setDbPort(env.getProperty("db.port.number"));
		dbConf.setDbService(env.getProperty("db.service.name"));
		dbConf.setDbUser(env.getProperty("db.user"));
		dbConf.setDbPassword(env.getProperty("db.password"));
		return dbConf;
	}
}

Spring bean demo class:

package com.java2novice.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.java2novice.bean.MyDbConfig;
import com.java2novice.config.MyApplicationConfig;

public class PropLoadDemo {

	public static void main(String a[]){

		@SuppressWarnings("resource")
		ApplicationContext context = 
						new AnnotationConfigApplicationContext(MyApplicationConfig.class);
		MyDbConfig dbConfig = (MyDbConfig) context.getBean("dbConfig");
		System.out.println(dbConfig.toString());
	}
}

Output:
db.java2novice.com|1521|test_db|java2novice|testme!*
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Knowledge Centre
What is fail-fast in java?
A fail-fast system is nothing but immediately report any failure that is likely to lead to failure. When a problem occurs, a fail-fast system fails immediately. In Java, we can find this behavior with iterators. Incase, you have called iterator on a collection object, and another thread tries to modify the collection object, then concurrent modification exception will be thrown. This is called fail-fast.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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