How to load Value Name property using @ConfigurationProperties in Spring

My properties file has content

config.entry [0] = X-FRAME-OPTIONS, SAMEORIGIN

config.entry [1] = Content-Security-Policy, self-self-ancestors

I want this to be loaded into a config class where I can have comma separated values ​​loaded as Key, Value pairs in the collection. How can this be achieved with @ConfigurationProperties in Spring 3?

Entries = config.getEntry () should give me a collection so that I can iterate and get a list of name value pairs defined in properties file

for(Entry<String,String> index : config.getEntry().entryset()) {
          index.getKey(); // Should Give - X-FRAME-OPTIONS
          index.getValue(); // Should Give - SAMEORIGIN
}

      

How should I define my Config class to be automatically associated with the values ​​from the properties file?

following implementation, throws Spring exception "Cannot convert value of type [java.lang.String] to required type [java.util.Map]" for property 'entry [0]': no ​​match editors or conversion strategy]

@Component
@ConfigurationProperties("config")
public class MyConfiguration {

  private Map<String,Map<String,String>> entry = new LinkedHashMap<String,Map<String,String>>();

  //getter for entry

  //setter for entry
}

      

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2 answers


You can do it in two parts, first just @ConfigurationProperties

like this:

@ConfigurationProperties(prefix = "config")
@Component
public class SampleConfigProperties {

    private List<String> entry;

    public List<String> getEntry() {
        return entry;
    }

    public void setEntry(List<String> entry) {
        this.entry = entry;
    }
}

      



This should cleanly load your properties into entry

your field SampleConfigProperties

initially. What you want to do next is not native to Spring - you want the first field in the comma delimited list to be the key in the map, this is custom logic, you can handle this logic using @PostConstruct

this logic By the way, how am I still using Spring conversionService

to convert semicolon separator String

to List<String>

:

import javax.annotation.PostConstruct;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@ConfigurationProperties(prefix = "config")
@Component
public class SampleConfigProperties {

    @Autowired
    private ConversionService conversionService;
    private List<String> entry;

    private Map<String, String> entriesMap;


    public List<String> getEntry() {
        return entry;
    }

    public void setEntry(List<String> entry) {
        this.entry = entry;
    }

    public Map<String, String> getEntriesMap() {
        return entriesMap;
    }

    public void setEntriesMap(Map<String, String> entriesMap) {
        this.entriesMap = entriesMap;
    }

    @PostConstruct
    public void postConstruct() {
        Map<String, String> entriesMap = new HashMap<>();
        for (String anEntry: entry) {
            List<String> l = conversionService.convert(anEntry, List.class);
            entriesMap.put(l.get(0), l.get(1));
        }
        this.entriesMap = entriesMap;
    }

}

      

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You can try with annotation @PostConstruct

that will be called after the bean in the constructed one. Here you can download the config file and update the map according to your needs.

For example:



@Component
public class Config {
    private Map<String, String> entry = new LinkedHashMap<String, String>();

    @PostConstruct
    private void init() throws IOException {
        try (InputStream input = ClassUtils.getDefaultClassLoader().getResourceAsStream("config.properties")) {
            for (String line : IOUtils.readLines(input)) {
                // change the logic as per your need
                String[] keyValue = line.split("=")[1].split(",");
                entry.put(keyValue[0], keyValue[1]);
            }
        }
    }
}

      

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