Java读取Excel的方法，解析xls、xlsx两种格式

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* 读取Excel
*
* @author zengwendong
*/
public class ReadExcelUtils {
private Logger logger = LoggerFactory.getLogger(ReadExcelUtils.class);
private Workbook wb;
private Sheet sheet;
private Row row;

public ReadExcelUtils(String filepath) {
if(filepath==null){
return;
}
String ext = filepath.substring(filepath.lastIndexOf("."));
try {
InputStream is = new FileInputStream(filepath);
if(".xls".equals(ext)){
wb = new HSSFWorkbook(is);
}else if(".xlsx".equals(ext)){
wb = new XSSFWorkbook(is);
}else{
wb=null;
}
} catch (FileNotFoundException e) {
logger.error("FileNotFoundException", e);
} catch (IOException e) {
logger.error("IOException", e);
}
}

/**
* 读取Excel表格表头的内容
*
* @param InputStream
* @return String 表头内容的数组
* @author zengwendong
*/
public String[] readExcelTitle() throws Exception{
if(wb==null){
throw new Exception("Workbook对象为空！");
}
sheet = wb.getSheetAt(0);
row = sheet.getRow(0);
// 标题总列数
int colNum = row.getPhysicalNumberOfCells();
System.out.println("colNum:" + colNum);
String[] title = new String[colNum];
for (int i = 0; i < colNum; i++) {
// title[i] = getStringCellValue(row.getCell((short) i));
title[i] = row.getCell(i).getCellFormula();
}
return title;
}

/**
* 读取Excel数据内容
*
* @param InputStream
* @return Map 包含单元格数据内容的Map对象
* @author zengwendong
*/
public Map<Integer, Map<Integer,Object>> readExcelContent() throws Exception{
if(wb==null){
throw new Exception("Workbook对象为空！");
}
Map<Integer, Map<Integer,Object>> content = new HashMap<Integer, Map<Integer,Object>>();

sheet = wb.getSheetAt(0);
// 得到总行数
int rowNum = sheet.getLastRowNum();
row = sheet.getRow(0);
int colNum = row.getPhysicalNumberOfCells();
// 正文内容应该从第二行开始,第一行为表头的标题
for (int i = 1; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
Map<Integer,Object> cellValue = new HashMap<Integer, Object>();
while (j < colNum) {
Object obj = getCellFormatValue(row.getCell(j));
cellValue.put(j, obj);
j++;
}
content.put(i, cellValue);
}
return content;
}

/**
*
* 根据Cell类型设置数据
*
* @param cell
* @return
* @author zengwendong
*/
private Object getCellFormatValue(Cell cell) {
Object cellvalue = "";
if (cell != null) {
// 判断当前Cell的Type
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:// 如果当前Cell的Type为NUMERIC
case Cell.CELL_TYPE_FORMULA: {
// 判断当前的cell是否为Date
if (DateUtil.isCellDateFormatted(cell)) {
// 如果是Date类型则，转化为Data格式
// data格式是带时分秒的：2013-7-10 0:00:00
// cellvalue = cell.getDateCellValue().toLocaleString();
// data格式是不带带时分秒的：2013-7-10
Date date = cell.getDateCellValue();
cellvalue = date;
} else {// 如果是纯数字

// 取得当前Cell的数值
cellvalue = String.valueOf(cell.getNumericCellValue());
}
break;
}
case Cell.CELL_TYPE_STRING:// 如果当前Cell的Type为STRING
// 取得当前的Cell字符串
cellvalue = cell.getRichStringCellValue().getString();
break;
default:// 默认的Cell值
cellvalue = "";
}
} else {
cellvalue = "";
}
return cellvalue;
}

public static void main(String[] args) {
try {
String filepath = "F:test.xls";
ReadExcelUtils excelReader = new ReadExcelUtils(filepath);
// 对读取Excel表格标题测试
// String[] title = excelReader.readExcelTitle();
// System.out.println("获得Excel表格的标题:");
// for (String s : title) {
// System.out.print(s + " ");
// }

// 对读取Excel表格内容测试
Map<Integer, Map<Integer,Object>> map = excelReader.readExcelContent();
System.out.println("获得Excel表格的内容:");
for (int i = 1; i <= map.size(); i++) {
System.out.println(map.get(i));
}
} catch (FileNotFoundException e) {
System.out.println("未找到指定路径的文件!");
e.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
}
}