验证码新增小写字母

src/main/java/com/jfinal/captcha/CaptchaRender.java

@@ -44,7 +44,7 @@ public class CaptchaRender extends Render {
 	// 默认的验证码大小
 	protected static final int WIDTH = 108, HEIGHT = 40;
 	// 验证码随机字符数组
-	protected static char[] charArray = "3456789ABCDEFGHJKMNPQRSTUVWXY".toCharArray();
+	protected static char[] charArray = "3456789ABCDEFGHJKMNPQRSTUVWXYabcdefghjkmnpqrstuvwxy".toCharArray();
 	// 验证码字体
 	protected static Font[] RANDOM_FONT = new Font[] {
 		new Font(Font.DIALOG, Font.BOLD, 33),

src/main/java/com/jfinal/ext/render/CaptchaRender.java

@@ -40,7 +40,7 @@ import com.jfinal.render.Render;
 public class CaptchaRender extends Render {
 
 	private static final int WIDTH = 80, HEIGHT = 26;
-	private static final String[] strArr = {"3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y"};
+	private static final char[] strArr = "3456789ABCDEFGHJKMNPQRSTUVWXYabcdefghjkmnpqrstuvwxy".toCharArray();
 
 	private String captchaName;