java全角、半角字符的关系以及转换详解

    public static void main(String[] args) {
        for (int i = Character.MIN_VALUE; i <= Character.MAX_VALUE; ++i) {
            System.out.println(i + "    " + (char)i);
        }
    }

/**
     * 全角字符串转换半角字符串
     *
     * @param fullWidthStr
     *            非空的全角字符串
     * @return 半角字符串
     */
    private static String fullWidth2halfWidth(String fullWidthStr) {
        if (null == fullWidthStr || fullWidthStr.length() <= 0) {
            return "";
        }
        char[] charArray = fullWidthStr.toCharArray();
        //对全角字符转换的char数组遍历
        for (int i = 0; i < charArray.length; ++i) {
            int charIntValue = (int) charArray[i];
            //如果符合转换关系,将对应下标之间减掉偏移量65248;如果是空格的话,直接做转换
            if (charIntValue >= 65281 && charIntValue <= 65374) {
                charArray[i] = (char) (charIntValue - 65248);
            } else if (charIntValue == 12288) {
                charArray[i] = (char) 32;
            }
        }
        return new String(charArray);
    }