How to load and iterate through properties file in Spring Boot

Question

I've a properties file in which the values are comma separated. I'm able to get the values as Object as below. Could anyone please tell me how to separate the values and get it in String.

.properties

key-1 = value1,value11 key-2 = value2,value22 key-3 = value3,value33 key-4 = value4,value44

Code

@PropertySource( value = "classpath:test1.properties", name = "test1" ) AbstractEnvironment ae = (AbstractEnvironment)env; org.springframework.core.env.PropertySource test1Source = ae.getPropertySources().get("test1"); Properties propsTest1 = (Properties)test1Source.getSource(); for(Object key : propsTest1.keySet()){ System.out.println("Properties file======> propsTest1.get(key)); }

Spring Expression Language (SPEL) will help your case. Check this question for some insight: stackoverflow.com/questions/12576156/… — vahdet
– vahdet, Commented Mar 15, 2019 at 9:40

Darshan Mehta · Accepted Answer · 2019-03-15 09:42:37Z

3

You can use @Value annotation with @PropertySource to get the value of a property. Also, you can use Spring Expression to split it into list, e.g.:

@PropertySource( value = "classpath:test1.properties", name = "test1" ) public class PropertyClass { @Value("#{'${key-1}'.split(',')}") private List<String> key1Values; }

This would give you the list of all the values configured against key-1.

edited Mar 15, 2019 at 9:42

answered Mar 15, 2019 at 9:38

Darshan Mehta

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3 Comments

Sam Over a year ago

Is there a way to get the values dynamically than creating a variable for every key?

Darshan Mehta Over a year ago

Don't think there is any way to do this unless you subclass PropertyPlaceholderConfigurer, read here : stackoverflow.com/a/11416312/1120793

Sam Over a year ago

This answer is good. But, I accepted Vinay's answer because it solved my problem. Upvoted your answer too. Thanks

vavasthi · Accepted Answer · 2019-03-15 09:40:02Z

You can try something like below.

Properties propsTest1 = (Properties)test1Source.getSource(); for(Map.Entry<Object, Object> e : propsTest1.entrySet()){ String value = (String)e.getValue(); String[] values = value.split(","); // If you have spaces as between values, you have to take care of it. }

Ihor Horovyi · Accepted Answer · 2019-03-15 09:59:12Z

.properties

map.key[0] = value1,value11 map.key[1] = value2,value22 map.key[2] = value3,value33 map.key[3] = value4,value44

Code

@ConfigurationProperties(prefix="map") public class YourConfig { private List<String> keys = new ArrayList<String>(); public List<String> getKeys() { return this.servers; } }

Or you can use:

keys={key-1:'value1',key-1:'value2',....}

Code

@Value("#{${keys}}") private Map<String,String> keys;

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