如何使用Maven为不同的配置文件执行任务

Question

I am new to Maven.

I want to perform database connection for different users so my problem is that where I should provide this JDBC connection and how to provide this connection for different users?

I know how to provide profiles for different users but where should I perform database connection and how it get invoked?

Answer 1

Best approach would make your database connection properties (like username/password, url, etc) external. Within a profile you could than define per user the values for the properties and use the maven resource filtering to set them.

Within your maven project you would for example have a config directory (in src/config/settings.prp ) which for example contains the following entries:

userName = ${userName}
password = ${password}
db-driver = ${dbDriver}
db-url = ${dbUrl}

Within the pom you would have

<project ...>
    <build>
        <plugins>
           <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-resources-plugin</artifactId>
               <version>2.7</version>
               <executions>
                   <execution>
                       <id>filter-db-settings</id>
                       <goals>
                           <goal>copy-resources</goal>
                       </goals>
                       <configuration>
                           <outputDirectory>${project.build.directory}/config</outputDirectory>
                           <resources>
                               <resource>
                                   <directory>${project.basedir}/src/config</directory>
                               </resource>
                               <filtering>true</filtering>
                           </resources>
                       </configuration> 
                   </execution>
               </executions>
           </plugin>
        <plugins>
    </build>

    <profiles>
        <profile>
            <id>user-A</id>
            <properties>
                <userName>userA</userName>
                <password>secret</password>
                <dbDriver>com.driver.db</dbDriver>
                <dbUrl>jdbc://db-url</dbUrl>
            </properties>
        </profile>
    <profiles>
</project>

The plugin will filter the files in src/config and replace the maven placeholders by the values as specified within your profile. Since the profile contains a password you could move it to your settings.xml so that it is not checked in with the project itself possibly exposing the password to unwanted parties.

WARNING: Haven't verified the plugin above so might contain small mistakes.

Best practice it to put the property file NOT within the generated artifact. By doing this you get the freedom to use the same artifact fro different users and the only thing you need to change are the properties in the external property file, (which will be given to user beside the artifact).

The following article explains how you can externalize the properties with spring Externalized Configuration .