Java 汉字转unicode

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public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入字符串：");
        while (true) {
            String s = scanner.next();
            if (s.equals("exit")){
                break;
            }
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < s.length(); i++) {
                char c = s.charAt(i);
                sb.append("\\u" + Integer.toHexString(c));
            }
            System.out.println(sb);
        }

    }