java 利用apache的 poi技术库读取excel数据

package com.csidc.as.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.LinkedList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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 class ReadExcel {
/**
* 对外提供读取excel 的方法
* */
public static List<List<Object>> readExcel(File file,String fileName) throws Exception {
// String fileName = file.getName();
String extension = fileName.lastIndexOf(".") == -1 ? "" : fileName
.substring(fileName.lastIndexOf(".") + 1);
if ("xls".equalsIgnoreCase(extension)) {
return read2003Excel(file);
} /*else if ("xlsx".equalsIgnoreCase(extension)) {
//return read2007Excel(file);
} */else {
throw new IOException("不支持的文件类型");
}
}

/**
* 读取 office 2003 excel
*
* @throws IOException
* @throws FileNotFoundException
*/
private static List<List<Object>> read2003Excel(File file)
throws IOException {

DecimalFormat df = new DecimalFormat("0");// 格式化 number String 字符 
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化日期字符串 
DecimalFormat nf = new DecimalFormat("0.00");// 格式化数字 

List<List<Object>> list = new LinkedList<List<Object>>();//存行值
HSSFWorkbook hwb = new HSSFWorkbook(new FileInputStream(file));
HSSFSheet sheet = hwb.getSheetAt(0);//第一个工作薄
Object value = null;//值
HSSFRow row = null;//行
HSSFCell cell = null;//列

//循环行
for (int i = sheet.getFirstRowNum()+1; i <= sheet
.getPhysicalNumberOfRows(); i++) {
row = sheet.getRow(i);
if (row == null) {
continue;
}
List<Object> linked = new LinkedList<Object>();////存列值

//循环列
for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
cell = row.getCell(j);//获得列
if (cell == null) {
linked.add("");//存列值
continue;
}

switch (cell.getCellType()) {
case XSSFCell.CELL_TYPE_STRING:
// System.out.println(i + "行" + j + " 列 is String type  字符串类型");
value = cell.getStringCellValue();
break;
case XSSFCell.CELL_TYPE_NUMERIC:
// System.out.println(i + "行" + j
// + " 列 is Number type ; DateFormt:"
// + cell.getCellStyle().getDataFormatString());

if ("@".equals(cell.getCellStyle().getDataFormatString())) {
value = df.format(cell.getNumericCellValue());
} else if ("General".equals(cell.getCellStyle()
.getDataFormatString())) {
value = nf.format(cell.getNumericCellValue());
} else {
value = sdf.format(HSSFDateUtil.getJavaDate(cell
.getNumericCellValue()));
}
break;
case XSSFCell.CELL_TYPE_BOOLEAN:
// System.out.println(i + "行" + j + " 列 is Boolean type");
value = cell.getBooleanCellValue();
break;
case XSSFCell.CELL_TYPE_BLANK:
// System.out.println(i + "行" + j + " 列 is Blank type");
value = "";
break;
default:
// System.out.println(i + "行" + j + " 列 is default type");
value = cell.toString();
}
if (value == null || "".equals(value)) {
continue;
}
linked.add(value);//存列值
}
list.add(linked);//存行值
}
return list;
}

/**
* 读取Office 2007 excel
* */
private static List<List<Object>> read2007Excel(File file)
throws IOException {
List<List<Object>> list = new LinkedList<List<Object>>();
// 构造 XSSFWorkbook 对象，strPath 传入文件路径
XSSFWorkbook xwb = new XSSFWorkbook(new FileInputStream(file));
// 读取第一章表格内容
XSSFSheet sheet = xwb.getSheetAt(0);
Object value = null;
XSSFRow row = null;
XSSFCell cell = null;
for (int i = sheet.getFirstRowNum(); i <= sheet
.getPhysicalNumberOfRows(); i++) {
row = sheet.getRow(i);
if (row == null) {
continue;
}
List<Object> linked = new LinkedList<Object>();
for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
cell = row.getCell(j);
if (cell == null) {
continue;
}
DecimalFormat df = new DecimalFormat("0");// 格式化 number String
// 字符
SimpleDateFormat sdf = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
DecimalFormat nf = new DecimalFormat("0.00");// 格式化数字
switch (cell.getCellType()) {
case XSSFCell.CELL_TYPE_STRING:
System.out.println(i + "行" + j + " 列 is String type");
value = cell.getStringCellValue();
break;
case XSSFCell.CELL_TYPE_NUMERIC:
System.out.println(i + "行" + j
+ " 列 is Number type ; DateFormt:"
+ cell.getCellStyle().getDataFormatString());
if ("@".equals(cell.getCellStyle().getDataFormatString())) {
value = df.format(cell.getNumericCellValue());
} else if ("General".equals(cell.getCellStyle()
.getDataFormatString())) {
value = nf.format(cell.getNumericCellValue());
} else {
value = sdf.format(HSSFDateUtil.getJavaDate(cell
.getNumericCellValue()));
}
break;
case XSSFCell.CELL_TYPE_BOOLEAN:
System.out.println(i + "行" + j + " 列 is Boolean type");
value = cell.getBooleanCellValue();
break;
case XSSFCell.CELL_TYPE_BLANK:
System.out.println(i + "行" + j + " 列 is Blank type");
value = "";
break;
default:
System.out.println(i + "行" + j + " 列 is default type");
value = cell.toString();
}
if (value == null || "".equals(value)) {
continue;
}
linked.add(value);
}
list.add(linked);
}
return list;
}
}