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src/main/java/com/wf/captcha/Randoms.java

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+package com.wf.captcha;
+
+import java.util.Random;
+
+/**
+ * <p>随机工具类</p>
+ *
+ * @author: wuhongjun
+ * @version:1.0
+ */
+public class Randoms
+{
+    private static final Random RANDOM = new Random();
+    //定义验证码字符.去除了O和I等容易混淆的字母
+    public static final char ALPHA[]={'A','B','C','D','E','F','G','H','G','K','M','N','P','Q','R','S','T','U','V','W','X','Y','Z'
+            ,'a','b','c','d','e','f','g','h','i','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z','2','3','4','5','6','7','8','9'};
+
+    /**
+     * 产生两个数之间的随机数
+     * @param min 小数
+     * @param max 比min大的数
+     * @return int 随机数字
+     */
+    public static int num(int min, int max)
+    {
+        return min + RANDOM.nextInt(max - min);
+    }
+
+    /**
+     * 产生0--num的随机数,不包括num
+     * @param num 数字
+     * @return int 随机数字
+     */
+    public static int num(int num)
+    {
+        return RANDOM.nextInt(num);
+    }
+
+    public static char alpha()
+    {
+        return ALPHA[num(0, ALPHA.length)];
+    }
+}