Unicode 与 String字符串之间的相互转换

public class U {
    public static String string2Unicode(String string) {
        if (string == null || string.isEmpty()) {
            return "";
        }
        StringBuilder unicode = new StringBuilder();
        for (int i = 0; i < string.length(); i++) {
            char c = string.charAt(i);
            unicode.append("\\u").append(Integer.toHexString(c));
        }
        return unicode.toString();
    }

    public static String unicode2String(String unicode) {
        if (unicode == null || unicode.isEmpty()) {
            return "";
        }
        StringBuilder string = new StringBuilder();
        String[] hex = unicode.split("\\\\u");
        for (int i = 1; i < hex.length; i++) {
            int data = Integer.parseInt(hex[i], 16);
            string.append((char) data);
        }
        return string.toString();
    }
}