java 半角与全角转换

    /**
     * 半角转全角
     * 
     * @param input String.
     * @return 全角字符串.
     */
    public static String toSBC(String input) {
        if (input == null) {
            return "";
        }
        char c[] = input.toCharArray();
        for (int i = 0; i < c.length; i++) {
            if (c[i] == ' ') {
                c[i] = '\u3000';
            } else if (c[i] < '\177') {
                c[i] = (char) (c[i] + 65248);

            }
        }
        return new String(c);
    }

  /**
     * 全角转半角
     * 
     * @param input String.
     * @return 半角字符串
     */
    public static String toDBC(String input) {
        if (input == null) {
            return "";
        }
        char c[] = input.toCharArray();
        for (int i = 0; i < c.length; i++) {
            if (c[i] == '\u3000') {
                c[i] = ' ';
            } else if (c[i] > '\uFF00' && c[i] < '\uFF5F') {
                c[i] = (char) (c[i] - 65248);

            }
        }
        return new String(c);
    }