#35 springboot: environment variables - java system

springboot/external/src/test/java/hello/external/JavaSystemProperties.java

@@ -0,0 +1,28 @@
+package hello.external;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.Properties;
+
+@Slf4j
+public class JavaSystemProperties {
+
+    public static void main(String[] args) {
+
+        System.setProperty("testKey", "testValue");
+        String testKey = System.getProperty("testKey");
+        log.info("testKey = {}", testKey);
+
+        Properties properties = System.getProperties();
+        properties.keySet()
+                .forEach(key -> log.info("prop {}={}", key, System.getProperty(String.valueOf(key))));
+
+        String url = System.getProperty("url");
+        String username = System.getProperty("username");
+        String password = System.getProperty("password");
+
+        log.info("url = {}", url);
+        log.info("username = {}", username);
+        log.info("password = {}", password);
+    }
+}