我要评论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;
}
}
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