Java 导出 Excel 列号数字与字母互相转换工具

package test;/**
* Deal with Excel column indexToStr and strToIndex
* @author
* @version 2015-7-8
* @see
*/
public class ExcelColumn { public static void main(String[] args) {
String colstr = "AA";
int colIndex = excelColStrToNum(colstr, colstr.length());
System.out.println("'" + colstr + "' column index of " + colIndex); colIndex = 26;
colstr = excelColIndexToStr(colIndex);
System.out.println(colIndex + " column in excel of " + colstr); colstr = "AAAA";
colIndex = excelColStrToNum(colstr, colstr.length());
System.out.println("'" + colstr + "' column index of " + colIndex); colIndex = 466948;
colstr = excelColIndexToStr(colIndex);
System.out.println(colIndex + " column in excel of " + colstr);
} /**
* Excel column index begin 1
* @param colStr
* @param length
* @return
*/
public static int excelColStrToNum(String colStr, int length) {
int num = 0;
int result = 0;
for(int i = 0; i < length; i++) {
char ch = colStr.charAt(length - i - 1);
num = (int)(ch - 'A' + 1) ;
num *= Math.pow(26, i);
result += num;
}
return result;
} /**
* Excel column index begin 1
* @param columnIndex
* @return
*/
public static String excelColIndexToStr(int columnIndex) {
if (columnIndex <= 0) {
return null;
}
String columnStr = "";
columnIndex--;
do {
if (columnStr.length() > 0) {
columnIndex--;
}
columnStr = ((char) (columnIndex % 26 + (int) 'A')) + columnStr;
columnIndex = (int) ((columnIndex - columnIndex % 26) / 26);
} while (columnIndex > 0);
return columnStr;
}
}