code: public static String string2Unicode(String string) {
  	    StringBuffer unicode = new StringBuffer();
  	    for (int i = 0; i < string.length(); i++) {
  	        char c = string.charAt(i);
  	        unicode.append("\\u" + Integer.toHexString(c));
  	    }
  	    return unicode.toString();
  	}
docs: 字符串转换unicode