[JAVA] [Spring Boot] How to get properties dynamically from a string contained in a URL

Get the value from the property file dynamically using Environment.


spring boot 2.0.3.RELEASE

Property file



Configuration class using Environment

Inject the Environment and call the getProperty method.


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
// @Specify the location of the property file with PropertySource
public class SampleProperty {
	//Inject Environment
	private Environment env;
	public String get(String key) {
		//Get property value from Environment
		return env.getProperty("sample." + key);


RestController (a class that calls the Configuration class)

Get the value from the Configuration class with the path included in the URL as the key.


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

public class SampleController {

	private SampleProperty prop;

	@GetMapping(path = "/user/{key}", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
	public String getUser(@PathVariable String key) {
		String result = prop.get(key);
		if (result == null) {
			result = "The value could not be obtained.";
		return result;

Operation check

Access http: // localhost: 8080 / user / name from your browser


Access http: // localhost: 8080 / user / age from your browser spring2.png

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