public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
        String s1 = "qwerabcdtyuiop";
        String s2 = "xcabcdvbn";
        String s = getMaxSubstring(s1, s2);
        System.out.println(s);
    }

    /**
     * 获取最大子串
     * 
     * @param s1
     * @param s2
     * @return
     */
    public static String getMaxSubstring(String s1, String s2) {
        String max = null, min = null;
        max = (s1.length() > s2.length()) ? s1 : s2;
        min = max.equals(s1) ? s2 : s1;
        for (int i = 0; i < min.length(); i++) {
            for (int a = 0, b = min.length() - i; b != min.length() + 1; a++, b++) {
                String sub = min.substring(a, b);
                if (max.contains(sub))
                    return sub;
            }
        }
        return null;
    }

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