CODEWITHSUNDEEP
javaspringproperties
efex09
efex09

Reputation: 419

Load external properties file with same keys

I have two properties file in a folder in file system. The path of this folder is passed using system properties -D=path/to/properties/folder

ex: java -jar -DpropDir=abc/def app.jar

These are properties files. Please note that both files have common key username,password.

mysql.properties

url=jdbc:mysql://localhost:3306
username=root
password=pass

vertica.properties

dburl=jdbc:vertica://123.123.123:4321/abcd
username=abcd
password=pass123

Now I want to access all these properties in respective classes. MySqlProperties.java and VerticaProperties.java like this.

@Component
public class VerticaProperties {

    @Value("${dburl}")
    private String dburl;
    @Value("${username}")
    private String username;
    @Value("${password}")
    private String password;

    public String getDbUrl() {
        return dburl;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }
}

and similarly MySqlProperties.java

@Component
public class MySqlProperties {

    @Value("${url}")
    private String url;
    @Value("${username}")
    private String username;
    @Value("${password}")
    private String password;

    public String getDbUrl() {
        return url;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }
}

But as key is same value is overriding for username and password.

How to access mysql.properties in MySqlProperties.java and vertica.properties in VerticaProperties.java classes.

Upvotes: 0

Views: 306

Answers (1)

Noman Khan
Noman Khan

Reputation: 960

You import external properties using @PropertySource

Given the location is shared as

-Dmysql.properties=file:/path-to-mysql.properties -Dvertica.properties=file:/path-to-vertica.properties

@Component
@PropertySource("${vertica.properties}")
public class VerticaProperties {
.....
}

@Component
@PropertySource("${mysql.properties}")
public class MySqlProperties {
....
}

or Given -Dmysql.properties=/path-to-mysql.properties -Dvertica.properties=/path-to-vertica.properties

@Component
    @PropertySource("file:${vertica.properties}")
    public class VerticaProperties {
    .....
    }

    @Component
    @PropertySource("file:${mysql.properties}")
    public class MySqlProperties {
    ....
    }

Additionally , you may also use prefix with @ConfigurationProperties along with @PropertySource.

The annotation works best when we have hierarchical properties that all have the same prefix, so we mention the prefix too as a part of the annotation.

Add prefix to keys like mysql.url , vertica.url in respective files 

@Component
@PropertySource("${vertica.properties}")
@ConfigurationProperties(prefix="vertica")
public class VerticaProperties {
.....
}

@Component
@PropertySource("${mysql.properties}")
@ConfigurationProperties(prefix="mysql")
public class MySqlProperties {
....
}

Upvotes: 1

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