Spring - Load properties

(application-context.xml)
In your application-context.xml, use the tag context:property-placeholder to define the property file where you have the values of your bean properties.

The value of location is the rath of your file:

<context:property-placeholder location="classpath*:spring/*.properties" />

In case that you have your property file outside your project:

<context:property-placeholder location=""file:///var/conf/conf.properties"/>
After define your file properties with the values:

db.name = test
db.user = user
db.password = password
db.port = 3306

Finally you can use the properties in your beans:

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

<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value= "${db.user}" />
<property name="password" value="${db.password}" />

</bean>

(web.xml)
In the web.xml don´t forget to include the file application-context.xml

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/application-context.xml
</param-value>
</context-param>

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