From e09ba8e3c2afc2ca27587e543c9328a56222ebde Mon Sep 17 00:00:00 2001
From: adasioo <adam.zawada@gmail.com>
Date: Fri, 19 May 2017 09:10:21 +0200
Subject: [PATCH] BAEL-923 How to inject a value from properties to a class not
 managed by Spring? (#1878)

* adam.zawada@gmail.com - Different Types of Bean Injection in Spring

* adam.zawada@gmail.com - Different Types of Bean Injection in Spring
switch to Java based configuration

* BAEL-895 calculate the period/duration between two dates in Java 8

* clean old PR

* BAEL-923 How to inject a value from properties to a class not managed by Spring?

* clean PR
---
 .../com/baeldung/util/PropertiesLoader.java   | 19 +++++++++++
 .../baeldung/util/PropertiesLoaderTest.java   | 34 +++++++++++++++++++
 .../test/resources/configuration.properties   |  4 +++
 3 files changed, 57 insertions(+)
 create mode 100644 core-java/src/main/java/com/baeldung/util/PropertiesLoader.java
 create mode 100644 core-java/src/test/java/com/baeldung/util/PropertiesLoaderTest.java
 create mode 100644 core-java/src/test/resources/configuration.properties

diff --git a/core-java/src/main/java/com/baeldung/util/PropertiesLoader.java b/core-java/src/main/java/com/baeldung/util/PropertiesLoader.java
new file mode 100644
index 0000000000..78f670913e
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/util/PropertiesLoader.java
@@ -0,0 +1,19 @@
+package com.baeldung.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Properties;
+
+public class PropertiesLoader {
+
+    public static Properties loadProperties(String resourceFileName) throws IOException {
+        Properties configuration = new Properties();
+        InputStream inputStream = PropertiesLoader.class
+          .getClassLoader()
+          .getResourceAsStream(resourceFileName);
+        configuration.load(inputStream);
+        inputStream.close();
+        return configuration;
+    }
+
+}
diff --git a/core-java/src/test/java/com/baeldung/util/PropertiesLoaderTest.java b/core-java/src/test/java/com/baeldung/util/PropertiesLoaderTest.java
new file mode 100644
index 0000000000..fa3c425156
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/util/PropertiesLoaderTest.java
@@ -0,0 +1,34 @@
+package com.baeldung.util;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.Properties;
+
+import static org.junit.Assert.assertEquals;
+
+public class PropertiesLoaderTest {
+
+    @Test
+    public void loadProperties_whenPropertyReaded_thenSuccess() throws IOException {
+        //given
+        final String RESOURCE_FILE_NAME = "configuration.properties";
+
+        final String SAMPLE_CONF_ENTRY = "sampleConfEntry";
+        final String COLON_SEPARATED_CONF_ENTRY = "colonSeparatedEntry";
+
+        final String GIVEN_CONF_ENTRY_VALUE = "sample String value";
+        final String COLON_SEPARATED_CONF_ENTRY_VALUE = "colon separated entry value";
+
+        //when
+        Properties config = PropertiesLoader.loadProperties(RESOURCE_FILE_NAME);
+
+        String sampleConfEntryValue = config.getProperty(SAMPLE_CONF_ENTRY);
+        String colonSeparatedConfEntryValue = config.getProperty(COLON_SEPARATED_CONF_ENTRY);
+
+        //then
+        assertEquals(GIVEN_CONF_ENTRY_VALUE, sampleConfEntryValue);
+        assertEquals(COLON_SEPARATED_CONF_ENTRY_VALUE, colonSeparatedConfEntryValue);
+
+    }
+}
diff --git a/core-java/src/test/resources/configuration.properties b/core-java/src/test/resources/configuration.properties
new file mode 100644
index 0000000000..338be84946
--- /dev/null
+++ b/core-java/src/test/resources/configuration.properties
@@ -0,0 +1,4 @@
+# this is sample property file for PropertiesLoaderTest configuration needs
+! this is also a comment
+sampleConfEntry = sample String value
+colonSeparatedEntry : colon separated entry value