java使用poi读取存储excel表格，包括xls和xlsx格式

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public static void main(String[] arges){
try {
List<List<String>> alldata=readExcel("myfile.xlsx");
for (List<String> arrayList : alldata) {
for (String string : arrayList) {
System.out.println(string);
}
}
} catch (Exception e) {
// TODO: handle exception
}

}

package com.lp.app.io;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

//使用poi读取excel表格，包括xls和xlsx格式
public class MyExcel_poi {

//读取表格文件
public static List<List<String>> readExcel(String path) throws IOException {
if (path == null ||"".equals(path)) {
return null;
} else {
String type = gettype(path);
if (!"".equals(type)) {
if ("xls".equals(type)) {
return readXls(path);
} else if ("xlsx".equals(type)) {
return readXlsx(path);
}
} else {
System.out.println(path + " : Not the Excel file!");
}
}
return null;
}
//根据路径查询是xls文件还是xlsx文件
public static String gettype(String path) {
if (path == null || "".equals(path.trim())) {
return "";
}
if (path.contains(".")) {
return path.substring(path.lastIndexOf(".") + 1, path.length());
}
return "";
}
//读取xlsx文件
public static List<List<String>> readXlsx(String path) throws IOException {
System.out.println("Processing..." + path);
InputStream is = new FileInputStream(path);
XSSFWorkbook xssfWorkbook = new XSSFWorkbook(is);
List<List<String>> list = new ArrayList<List<String>>();
// Read the Sheet
for (int numSheet = 0; numSheet < xssfWorkbook.getNumberOfSheets(); numSheet++) {
XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(numSheet);
if (xssfSheet == null) {
continue;
}
// Read the Row
for (int rowNum = 1; rowNum <= xssfSheet.getLastRowNum(); rowNum++)
{
XSSFRow xssfRow = xssfSheet.getRow(rowNum);
if (xssfRow != null) {
//hssfSheet.getLastRowNum();//最后一行行标，比行数小1
//hssfSheet.getRow(k).getLastCellNum();//获取列数，比最后一列列标大1
List<String> rowStrings = new ArrayList<String>();
for (int columnNum = 0; columnNum < xssfRow.getLastCellNum(); columnNum++)
{
rowStrings.add(getValue(xssfRow.getCell(columnNum)));
}
list.add(rowStrings);
}
}
}
xssfWorkbook.close();
return list;
}

//读取xls文件
public static List<List<String>> readXls(String path) throws IOException {
System.out.println("Processing..." + path);
InputStream is = new FileInputStream(path);
HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
List<List<String>> list = new ArrayList<List<String>>();
// Read the Sheet
for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
if (hssfSheet == null) {
continue;
}
// Read the Row
for (int rowNum = 0; rowNum <= hssfSheet.getLastRowNum(); rowNum++)
{
HSSFRow hssfRow = hssfSheet.getRow(rowNum);
if (hssfRow != null)
{
//hssfSheet.getLastRowNum();//最后一行行标，比行数小1
//hssfSheet.getRow(k).getLastCellNum();//获取列数，比最后一列列标大1
List<String> rowStrings = new ArrayList<String>();
for (int columnNum = 0; columnNum < hssfRow.getLastCellNum(); columnNum++)
{
rowStrings.add(getValue(hssfRow.getCell(columnNum)));
}
list.add(rowStrings);
}
}
}
hssfWorkbook.close();
return list;
}

@SuppressWarnings("static-access")
private static String getValue(XSSFCell xssfRow) {
if (xssfRow.getCellType() == xssfRow.CELL_TYPE_BOOLEAN) {
return String.valueOf(xssfRow.getBooleanCellValue());
} else if (xssfRow.getCellType() == xssfRow.CELL_TYPE_NUMERIC) {
return String.valueOf(xssfRow.getNumericCellValue());
} else {
return String.valueOf(xssfRow.getStringCellValue());
}
}

@SuppressWarnings("static-access")
private static String getValue(HSSFCell hssfCell) {
if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
return String.valueOf(hssfCell.getBooleanCellValue());
} else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
return String.valueOf(hssfCell.getNumericCellValue());
} else {
return String.valueOf(hssfCell.getStringCellValue());
}
}
}