Adding containsWhitespace method per LANG-625. Code comes from the Spring framework, so I've added such to the NOTICE file. License is Apache License 2.0. Unit test is original.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@956775 13f79535-47bb-0310-9956-ffa450edef68

NOTICE.txt

@@ -3,3 +3,5 @@ Copyright 2001-2010 The Apache Software Foundation
 
 This product includes software developed by
 The Apache Software Foundation (http://www.apache.org/).
+
+This product includes software from the Spring Framework.

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

@@ -1347,6 +1347,28 @@ public class StringUtils {
         return false;
     }
 
+    /**
+     * Check whether the given String contains any whitespace characters.
+     * @param str the String to check (may be <code>null</code>)
+     * @return <code>true</code> if the String is not empty and
+     * contains at least 1 whitespace character
+     * @see java.lang.Character#isWhitespace
+     * @since 3.0
+     */
+    // From org.springframework.util.StringUtils, under Apache License 2.0
+    public static boolean containsWhitespace(String str) {
+        if (isEmpty(str)) {
+            return false;
+        }
+        int strLen = str.length();
+        for (int i = 0; i < strLen; i++) {
+            if (Character.isWhitespace(str.charAt(i))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     // IndexOfAny chars
     //-----------------------------------------------------------------------
     /**

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

@@ -431,6 +431,16 @@ public class StringUtilsEqualsIndexOfTest extends TestCase {
         assertEquals(true, StringUtils.containsOnly(str3, chars3));
     }
 
+    public void testContainsWhitespace() {
+        assertFalse( StringUtils.containsWhitespace("") );
+        assertTrue( StringUtils.containsWhitespace(" ") );
+        assertFalse( StringUtils.containsWhitespace("a") );
+        assertTrue( StringUtils.containsWhitespace("a ") );
+        assertTrue( StringUtils.containsWhitespace(" a") );
+        assertTrue( StringUtils.containsWhitespace("a\t") );
+        assertTrue( StringUtils.containsWhitespace("\n") );
+    }
+
     public void testEquals() {
         assertEquals(true, StringUtils.equals(null, null));
         assertEquals(true, StringUtils.equals(FOO, FOO));