如果代码只创建了XSSFWorkbook,没有创建XSSFSheet的话，创建的excel是打不开的
一、调用excel文件里面的内容
import java.io.File;
import java.io.FileInputStream;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class Readsheet
{
static XSSFRow row;
public static void main(String[] args) throws Exception
{
FileInputStream fis = new FileInputStream(
new File("WriteSheet.xlsx"));
XSSFWorkbook workbook = new XSSFWorkbook(fis);
XSSFSheet spreadsheet = workbook.getSheetAt(0);
Iterator < Row > rowIterator = spreadsheet.iterator();
while (rowIterator.hasNext())
{
row = (XSSFRow) rowIterator.next();
Iterator < Cell > cellIterator = row.cellIterator();
while ( cellIterator.hasNext())
{
Cell cell = cellIterator.next();
switch (cell.getCellType())
{
case Cell.CELL_TYPE_NUMERIC:
System.out.print(
cell.getNumericCellValue() + " \t\t " );
break;
case Cell.CELL_TYPE_STRING:
System.out.print(
cell.getStringCellValue() + " \t\t " );
break;
}
}
System.out.println();
}
fis.close();
}
}
二、将内容写入到excel中
import java.io.File;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class Writesheet
{
public static void main(String[] args) throws Exception
{
//Create blank workbook
XSSFWorkbook workbook = new XSSFWorkbook();
//Create a blank sheet
XSSFSheet spreadsheet = workbook.createSheet(
" Employee Info ");
//Create row object
XSSFRow row;
//This data needs to be written (Object[])
Map < String, Object[] > empinfo =
new TreeMap < String, Object[] >();
empinfo.put( "1", new Object[] {
"EMP ID", "EMP NAME", "DESIGNATION" });
empinfo.put( "2", new Object[] {
"tp01", "Gopal", "Technical Manager" });
empinfo.put( "3", new Object[] {
"tp02", "Manisha", "Proof Reader" });
empinfo.put( "4", new Object[] {
"tp03", "Masthan", "Technical Writer" });
empinfo.put( "5", new Object[] {
"tp04", "Satish", "Technical Writer" });
empinfo.put( "6", new Object[] {
"tp05", "Krishna", "Technical Writer" });
//Iterate over data and write to sheet
Set < String > keyid = empinfo.keySet();
int rowid = 0;
for (String key : keyid)
{
row = spreadsheet.createRow(rowid++);
Object [] objectArr = empinfo.get(key);
int cellid = 0;
for (Object obj : objectArr)
{
Cell cell = row.createCell(cellid++);
cell.setCellValue((String)obj);
}
}
//Write the workbook in file system
FileOutputStream out = new FileOutputStream(
new File("Writesheet.xlsx"));
workbook.write(out);
out.close();
System.out.println(
"Writesheet.xlsx written successfully" );
}
}
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