java 获取excel 横向坐标

/**
 * @author Ad'min 
 * @deprecated ExcelUtils 获取excle 横向坐标
 */

public class ExcelUtils {

    public static void main(String[] args) {
        int start = columnToIndex("A");
        int end = columnToIndex("ZZ");
        int num= 0;
        while(start < end){
            System.out.println(indexToColumn(start));
            start++;
            num++;
        }
        System.out.println(num);
    }

    /**
     * 用于将Excel表格中列号字母转成列索引，从1对应A开始
     *
     * @param column
     *            列号
     * @return 列索引
     */
    public static int columnToIndex(String column) {
        if (!column.matches("[A-Z]+")) {
            try {
                throw new Exception("Invalid parameter");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        int index = 0;
        char[] chars = column.toUpperCase().toCharArray();
        for (int i = 0; i < chars.length; i++) {
            index += ((int) chars[i] - (int) 'A' + 1)
                    * (int) Math.pow(26, chars.length - i - 1);
        }
        return index;
    }

    /**
     * 用于将excel表格中列索引转成列号字母，从A对应1开始
     *
     * @param index
     *            列索引
     * @return 列号
     */
    public static String indexToColumn(int index) {
        if (index <= 0) {
            try {
                throw new Exception("Invalid parameter");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        index--;
        String column = "";
        do {
            if (column.length() > 0) {
                index--;
            }
            column = ((char) (index % 26 + (int) 'A')) + column;
            index = (int) ((index - index % 26) / 26);
        } while (index > 0);
        return column;
    }

}