package poi;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

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;

public class Testpoi {

public static void main(String[] args) {

Workbook wb =null;

Sheet sheet = null;

Row row = null;

List> list = null;

String cellData = null;

String filePath = "D:\\test.xlsx";

String columns[] = {"name","age","score"};

wb = readExcel(filePath);

if(wb != null){

//用来存放表中数据

list = new ArrayList>();

//获取第一个sheet

sheet = wb.getSheetAt(0);

//获取最大行数

int rownum = sheet.getPhysicalNumberOfRows();

//获取第一行

row = sheet.getRow(0);

//获取最大列数

int colnum = row.getPhysicalNumberOfCells();

for (int i = 1; i

Map map = new LinkedHashMap();

row = sheet.getRow(i);

if(row !=null){

for (int j=0;j

cellData = (String) getCellFormatValue(row.getCell(j));

map.put(columns[j], cellData);

}

}else{

break;

}

list.add(map);

}

}

//遍历解析出来的list

for (Map map : list) {

for (Entry entry : map.entrySet()) {

System.out.print(entry.getKey()+":"+entry.getValue()+",");

}

System.out.println();

}

}

//读取excel

public static Workbook readExcel(String filePath){

Workbook wb = null;

if(filePath==null){

return null;

}

String extString = filePath.substring(filePath.lastIndexOf("."));

InputStream is = null;

try {

is = new FileInputStream(filePath);

if(".xls".equals(extString)){

return wb = new HSSFWorkbook(is);

}else if(".xlsx".equals(extString)){

return wb = new XSSFWorkbook(is);

}else{

return wb = null;

}

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return wb;

}

public static Object getCellFormatValue(Cell cell){

Object cellValue = null;

if(cell!=null){

//判断cell类型

switch(cell.getCellType()){

case Cell.CELL_TYPE_NUMERIC:{

cellValue = String.valueOf(cell.getNumericCellValue());

break;

}

case Cell.CELL_TYPE_FORMULA:{

//判断cell是否为日期格式

if(DateUtil.isCellDateFormatted(cell)){

//转换为日期格式YYYY-mm-dd

cellValue = cell.getDateCellValue();

}else{

//数字

cellValue = String.valueOf(cell.getNumericCellValue());

}

break;

}

case Cell.CELL_TYPE_STRING:{

cellValue = cell.getRichStringCellValue().getString();

break;

}

default:

cellValue = "";

}

}else{

cellValue = "";

}

return cellValue;

}

}