How to read file using groovy and store its contents are variables?

Question

I'm looking for groovy specific way to read file and store its content as different variables. Example of my properties file:

#Local credentials:
postgresql.url = xxxx.xxxx.xxxx
postgresql.username = xxxxxxx
postgresql.password = xxxxxxx
console.url = xxxxx.xxxx.xxx

At the moment I'm using this java code to read the file and use variables:

  Properties prop = new Properties();
  InputStream input = null;

  try {
            input = new FileInputStream("config.properties");
            prop.load(input);
            this.postgresqlUser = prop.getProperty("postgresql.username")
            this.postgresqlPass = prop.getProperty("postgresql.password")
            this.postgresqlUrl = prop.getProperty("postgresql.url")
            this.consoleUrl = prop.getProperty("console.url")

        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                }
            }
        }
    }

My colleague recommended to use groovy way to deal with this and mentioned streams but I can't seem to find much information about on how to store data in separate variables, what I know so far is that def text = new FileInputStream("config.properties").getText("UTF-8") could read whole file and store it in one variable, but not separate. Any help would be appreciated

http://stackoverflow.com/questions/20871441/get-values-from-properties-file-using-groovy — tim_yates, Jan 21 '16 at 15:39
@tim thanks, solved my problem instead of all these try and catch now I can use `propertiesFile.withInputStream` closure. — Tomas, Jan 21 '16 at 16:04

score 3 · Answer 1 · answered Jan 21 '16 at 16:11

If you're willing to make your property file keys and class properties abide by a naming convention, then you can apply the property file values quite easily. Here's an example:

def config = '''
#Local credentials:
postgresql.url = xxxx.xxxx.xxxx
postgresql.username = xxxxxxx
postgresql.password = xxxxxxx
console.url = xxxxx.xxxx.xxx
'''

def props = new Properties().with {
    load(new StringBufferInputStream(config))
    delegate
}

class Foo {
    def postgresqlUsername
    def postgresqlPassword
    def postgresqlUrl
    def consoleUrl

    Foo(Properties props) {
        props.each { key, value ->
            def propertyName = key.replaceAll(/\../) { it[1].toUpperCase() }
            setProperty(propertyName, value)
        }
    }
}

def a = new Foo(props)

assert a.postgresqlUsername == 'xxxxxxx'
assert a.postgresqlPassword == 'xxxxxxx'
assert a.postgresqlUrl == 'xxxx.xxxx.xxxx'
assert a.consoleUrl == 'xxxxx.xxxx.xxx'

In this example, the property keys are converted by dropping the '.' and capitalizing the following letter. So postgresql.url becomes postgresqlUrl. Then it's just a matter for iterating through the keys and calling setProperty() to apply the value.

score 1 · Accepted Answer · answered Jan 21 '16 at 15:50

1

Take a look at the ConfigSlurper:

http://mrhaki.blogspot.de/2009/10/groovy-goodness-using-configslurper.html

answered Jan 21 '16 at 15:50

rdmueller

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1

Agreed. ConfigSlurper is a much better option to using traditional Java properties files. Makes it a breeze. – pczeus Jan 21 '16 at 15:51

How to read file using groovy and store its contents are variables?

2 Answers2