[LANG-1297] SystemUtils.getHostName() API.

src/changes/changes.xml

@@ -72,6 +72,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action issue="LANG-1277" type="update" dev="pschumacher" due-to="yufcuy">StringUtils#getLevenshteinDistance reduce memory consumption</action>
     <action issue="LANG-1279" type="update" dev="ggregory">Update Java requirement from Java 6 to 7.</action>
     <action issue="LANG-1143" type="update" dev="pschumacher" due-to="sebb">StringUtils should use toXxxxCase(int) rather than toXxxxCase(char)</action>
+    <action issue="LANG-1297" type="update" dev="ggregory">Add SystemUtils.getHostName() API.</action>
   </release>
 
   <release version="3.5" date="2016-10-13" description="New features including Java 9 detection">

src/main/java/org/apache/commons/lang3/SystemUtils.java

@@ -1493,6 +1493,16 @@ public static File getJavaHome() {
         return new File(System.getProperty(JAVA_HOME_KEY));
     }
 
+    /**
+     * Gets the host name.
+     * 
+     * @return the host name.
+     * @since 3.6
+     */
+    public static String getHostName() {
+        return SystemUtils.IS_OS_WINDOWS ? System.getenv("COMPUTERNAME") : System.getenv("HOSTNAME");
+    }
+
     /**
      * <p>
      * Gets the Java IO temporary directory as a {@code File}.

src/test/java/org/apache/commons/lang3/SystemUtilsTest.java

@@ -58,6 +58,15 @@ public void testConstructor() {
         assertFalse(Modifier.isFinal(SystemUtils.class.getModifiers()));
     }
 
+    @Test
+    public void testGetHostName() {
+        final String hostName = SystemUtils.getHostName();
+        Assert.assertNotNull(hostName);
+        Assert.assertFalse(hostName.isEmpty());
+        String expected = SystemUtils.IS_OS_WINDOWS ? System.getenv("COMPUTERNAME") : System.getenv("HOSTNAME");
+        Assert.assertEquals(expected, hostName);
+    }
+
     /**
      * Assumes no security manager exists.
      */