poi关于excel文件的操作
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
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.ss.usermodel.WorkbookFactory;
import org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
/**
* 操作Excel表格的功能类
*/
public class ExcelReader {
private Workbook wb;
private Sheet sheet;
private Row row;
private boolean isXssf = false;
public ExcelReader(InputStream is) {
try {
wb = WorkbookFactory.create(is);
if (wb instanceof XSSFWorkbook) {
isXssf = true;
}
} catch (IOException e) {
e.printStackTrace();
} catch (InvalidFormatException e) {
e.printStackTrace();
}
}
/**
* 读取Excel表格表头的内容
*/
public String[] readExcelTitle() {
sheet = wb.getSheetAt(0);
row = sheet.getRow(0);
// 标题总列数
int colNum = row.getPhysicalNumberOfCells();
String[] title = new String[colNum];
for (int i = 0,length=colNum; i < length; i++) {
//title[i] = getStringCellValue(row.getCell((short) i));
title[i] = (String) getCellFormatValue1(row.getCell((short) i));
// String title1=sheet.getRow(0).getCell(1).toString();
}
sheet=wb.getSheetAt(0);
return title;
}
/**
* 读取Excel数据内容
*/
public Map<Integer, String> readExcelContent() {
Map<Integer, String> content = new HashMap<Integer, String>();
String str = "";
sheet = wb.getSheetAt(0);
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;
while (j < colNum) {
str += getCellFormatValue1(row.getCell((short) j)) + " ";
j++;
}
content.put(i, str);
str = "";
}
return content;
}
/**
* 获取单元格数据内容为字符串类型的数据
*/
private String getStringCellValue(HSSFCell cell) {
String strCell = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
strCell = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
strCell = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
strCell = "";
break;
default:
strCell = "";
break;
}
if (strCell.equals("") || strCell == null) {
return "";
}
if (cell == null) {
return "";
}
return strCell;
}
/**
* 获取单元格数据内容为日期类型的数据
*/
private String getDateCellValue(HSSFCell cell) {
String result = "";
try {
int cellType = cell.getCellType();
if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
Date date = cell.getDateCellValue();
result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
+ "-" + date.getDate();
} else if (cellType == HSSFCell.CELL_TYPE_STRING) {
String date = getStringCellValue(cell);
result = date.replaceAll("[年月]", "-").replace("日", "").trim();
} else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
result = "";
}
} catch (Exception e) {
System.out.println("日期格式不正确!");
e.printStackTrace();
}
return result;
}
/**
* 根据HSSFCell类型设置数据
*/
private String getCellFormatValue(HSSFCell cell) {
String cellvalue = "";
if (cell != null) {
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
case HSSFCell.CELL_TYPE_FORMULA: {
// 判断当前的cell是否为Date
if (HSSFDateUtil.isCellDateFormatted(cell)) {
//方法1：这样子的data格式是带时分秒的：2011-10-12 0:00:00
//cellvalue = cell.getDateCellValue().toLocaleString();
//方法2：这样子的data格式是不带带时分秒的：2011-10-12
Date date = cell.getDateCellValue();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
cellvalue = sdf.format(date);
}
// 如果是纯数字
else {
cellvalue = String.valueOf(cell.getNumericCellValue());
}
break;
}
// 如果当前Cell的Type为STRIN
case HSSFCell.CELL_TYPE_STRING:
cellvalue = cell.getRichStringCellValue().getString();
break;
// 默认的Cell值
default:
cellvalue = " ";
}
} else {
cellvalue = "";
}
return cellvalue;
}
public Object getCellFormatValue1(Cell cell) {
Object cellvalue = null;
if (cell != null) {
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:{
cellvalue = cell.getNumericCellValue();
String type = (String)getCellFormatValue1(cell.getRow().getCell(cell.getColumnIndex()+1));
if("Date".equals(type)){
cellvalue = cell.getDateCellValue();
}else if("String".equals(type)){
Double value = Double.parseDouble(cellvalue.toString());
cellvalue=value.longValue()+"";
}else if("Long".equals(type)){
cellvalue = cell.getNumericCellValue()+"";
}else if("Double".equals(type)){
cellvalue = cell.getNumericCellValue()+"";
}
break;
}
case Cell.CELL_TYPE_FORMULA:{
FormulaEvaluator evaluator = null;
if(isXssf){
evaluator = new XSSFFormulaEvaluator((XSSFWorkbook)cell.getRow().getSheet().getWorkbook());
} else {
evaluator = new HSSFFormulaEvaluator((HSSFWorkbook)cell.getRow().getSheet().getWorkbook());
}
cell.setCellFormula(cell.getCellFormula());
Cell cell1 = evaluator.evaluateInCell(cell);
cellvalue = getCellFormatValue1(cell1);
break;
}
case Cell.CELL_TYPE_STRING:{
cellvalue = cell.getRichStringCellValue().getString();
// Object obj = getCellFormatValue(cell.getRow().getCell(cell.getColumnIndex()+1));
// String type = (String)obj;
// if( "0".equals(cellvalue) && "String".equals(type)){
// cellvalue = "";
// }
break;
}
default:
return null;
}
}
return cellvalue;
}
public static void main(String[] args) {
try {
InputStream is = new FileInputStream("H:\\DESKTOP\\区域科室.xls");
ExcelReader excelReader = new ExcelReader(is);
String[] title = excelReader.readExcelTitle();
System.out.println("获得Excel表格的标题:");
for (String s : title) {
System.out.print(s + " ");
}
System.out.println("--------------");
Map<Integer, String> 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) {
e.printStackTrace();
}
}
}