【java】java解析Excel文件

java解析Excel文件

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<Map<String,String>> 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<Map<String,String>>();
        //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<rownum; i++) {
            Map<String,String> map = new LinkedHashMap<String,String>();
            row = sheet.getRow(i);
            if(row !=null){
                for (int j=0;j<colnum;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<String,String> map : list) {
        for (Entry<String,String> 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:{
            //防止变成科学计数法
            DecimalFormat df = new DecimalFormat("0");
            cellValue = df.format(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;
    }
}