添加 MoreStrings。

src/main/java/xyz/zhouxy/plusone/commons/util/MoreStrings.java

@@ -0,0 +1,23 @@
+package xyz.zhouxy.plusone.commons.util;
+
+import javax.annotation.Nullable;
+
+public class MoreStrings {
+    public static boolean hasText(@Nullable String str) {
+        return (str != null && !str.isEmpty() && containsText(str));
+    }
+
+    private static boolean containsText(CharSequence str) {
+        int strLen = str.length();
+        for (int i = 0; i < strLen; i++) {
+            if (!Character.isWhitespace(str.charAt(i))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private MoreStrings() {
+        throw new IllegalStateException("Utility class");
+    }
+}