java解析Excel（xls、xlsx两种格式）

2022-07-31 10:47:07

https://www.cnblogs.com/hhhshct/p/7255915.html

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一、需要导入的jar

　　1.commons-collections4-4.1.jar

　　2.poi-3.17-beta1.jar

　　3.poi-ooxml-3.17-beta1.jar

　　4.poi-ooxml-schemas-3.17-beta1.jar

　　5.xmlbeans-2.6.0.jar

maven

  <dependency>

    <groupId>org.apache.poi</groupId>

    <artifactId>poi-ooxml</artifactId>

    <version>3.17</version>

</dependency>

二、主要API

　　1.import org.apache.poi.ss.usermodel.Workbook,对应Excel文档；

　　2.import org.apache.poi.hssf.usermodel.HSSFWorkbook，对应xls格式的Excel文档；

　　3.import org.apache.poi.xssf.usermodel.XSSFWorkbook，对应xlsx格式的Excel文档；

　　4.import org.apache.poi.ss.usermodel.Sheet，对应Excel文档中的一个sheet；

　　5.import org.apache.poi.ss.usermodel.Row，对应一个sheet中的一行；

　　6.import org.apache.poi.ss.usermodel.Cell，对应一个单元格。

三、代码如下

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<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:{

                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;

    }

}

四、运行结果

　　代码运行前保证在D盘下有一个test.xlsx文档，不然报文件找不到异常；Excel文档中的表头要和代码中的String columns[] = {"name","age","score"}对应起来。

例2

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import org.apache.poi.xssf.usermodel.XSSFRow;

import org.apache.poi.xssf.usermodel.XSSFSheet;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class TestExcel {

    public static void main(String[] args) throws IOException{

          // 创建工作薄 xlsx

        XSSFWorkbook  xssWorkbook = new XSSFWorkbook();

          // 创建工作表

        XSSFSheet  sheet = xssWorkbook.createSheet("sheet1");

          for (int row = 0; row < 10; row++)

          {

              XSSFRow  rows = sheet.createRow(row);

             for (int col = 0; col < 10; col++)

             {

                // 向工作表中添加数据

                rows.createCell(col).setCellValue("data" + row + col);

             }

          }

//

          File xlsFile = new File("poi.xlsx");

          FileOutputStream xlsStream = new FileOutputStream(xlsFile);

          xssWorkbook.write(xlsStream);

    }

}

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