db_driverClassName=com.mysql.jdbc.Driver

db_url=jdbc:mysql://127.0.0.1/test

db_username=root

db_password=root

test_userName=Robin

test_age=

    <bean id="configProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">

        <property name="locations">

            <list>

                <value>classpath*:settings.properties</value>

            </list>

        </property>

    </bean>

    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

        <property name="ignoreResourceNotFound" value="false" />

        <property name="properties" ref="configProperties" />

    </bean>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="${db_driverClassName}"/>

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

        <property name="username" value="${db_username}" />

        <property name="password" value="${db_password}" />

    </bean>

package com.my.common;

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

import org.springframework.stereotype.Component;

@Component

public class Settings {

    private static Settings instance;

    public static Settings getInstance() {

        return instance;

    }

    public Settings() {

        instance = this;

    }

    @Value("#{configProperties['test_userName']}")

    private String userName;

    @Value("#{configProperties['test_age']}")

    private int age;

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

}

Settings.getInstance().getUserName()