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javaarraysspring-bootyamlsnakeyaml
Rishab Prasad
Rishab Prasad

Reputation: 951

Read Integer List from yaml file

The current implementation is :-

public static final List<Integer> validCodes = Collections.unmodifiableList(Arrays.asList(110, 210, 310,510,610));

However, I am not happy with this approach as this of hard coded. I want to make it configurable instead of hard-coded. I suppose reading this values from the yaml file would solve my problem.

But how do I define a list of Integer in the yaml file and real it using @value. I can find a lot of example about reading list of strings but not integers.

Upvotes: 2

Views: 9163

Answers (3)

Jawadh Salih Rifath
Jawadh Salih Rifath

Reputation: 150

Within the application.yml file, define the config variable as follows.

my_integers: 1231,12323,12321

then use the @Value annotation to make to an Integer list as follows.

@Value("#{'${my_integers}'.split(',')}")
private List<Integer> myIntegers;

Spring does the rest. You only need to use myIntegers with your need. Happy coding....

PS: I have used spring boot 2.0.*

Upvotes: 1

Vebbie
Vebbie

Reputation: 1695

One way:

Let's say if the properties file contains

intArr={1,2,3}

Then @Value can be used like:

@Value("#{${intArr}}")
Integer[] intArr;

Second way:

If the property contains comma separated values as: intArr: [1, 2, 3]

Then the annotation code would be:

@Value("${intArr}")
private int[] intArr;

Edit:

You can configure ConversionServiceFactoryBean which activates the new configuration service which supports converting String to Collection types.

By activating this, it will support following kind of conversion:

 intArray= 1, 2, 3, 4

And the following code:

@Value("${intArray}")
private List<Integer> myList;

Ref here

Upvotes: 0

Thusitha Indunil
Thusitha Indunil

Reputation: 832

You can used following method for getting all available properties from YML file. When you used following method, you have to add following jar into your build script.

compile group: 'org.yaml', name: 'snakeyaml', version: '1.12'

I think this will help you to continue your task.

private Map<String, Object> loadYMLData() {
        Map<String, Object> result = new HashMap<String, Object>();
        try {
            String fileName = "{{YAMAL FILE NAME}}.yml";
            Yaml yaml = new Yaml();
            ClassLoader classLoader = getClass().getClassLoader();
            File file = new File(classLoader.getResource(fileName).getFile());
            InputStream ios = new FileInputStream(file);

            // Parse the YAML file and return the output as a series of Maps and Lists
            result = (Map<String, Object>) yaml.load(ios);
            System.out.println(result.toString());

        } catch (Exception e) {
            logger.error("Error==>", e);
        }
        return result;
    }

Upvotes: 0

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