java操作excel文件

这里用一个简单的例子来演示 java操作excel文件

用maven可以把包导入进来：

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org.apache.poi
poi-ooxml
3.9

demo

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package com.example.demo.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

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;

/**

• 读取Excel

• @author zengwendong
  */
  public class ReadExcelUtils {

  private Workbook wb;
  private Sheet sheet;
  private Row row;

  public ReadExcelUtils(String filepath) {
  if (filepath == null) {
  return;
  }

   try {
       InputStream is = new FileInputStream(filepath);
       String ext = filepath.substring(filepath.lastIndexOf("."));
       if (".xls".equals(ext)) {
           wb = new HSSFWorkbook(is);
       } else if (".xlsx".equals(ext)) {
           wb = new XSSFWorkbook(is);
       } else {
           wb = null;
       }
   } catch (FileNotFoundException e) {
       System.out.println(e.getLocalizedMessage() + "找不到文件");
   } catch (IOException e) {
       System.out.println(e.getMessage() + "io的异常");
   }
  

  }

  /**

  • 读取Excel表格表头的内容
  • @param InputStream
  • @return String 表头内容的数组
  • @author zengwendong
    */
    public String[] readExcelTitle() throws Exception {
    if (wb == null) {
    throw new Exception("Workbook对象为空！");
    }
    sheet = wb.getSheetAt(0);
    row = sheet.getRow(0);
    // 标题总列数
    int colNum = row.getPhysicalNumberOfCells();
    System.out.println("colNum:" + colNum);
    String[] title = new String[colNum];
    for (int i = 0; i < colNum; i++) {
    // title[i] = getStringCellValue(row.getCell((short) i));
    title[i] = row.getCell(i).getCellFormula();
    }
    return title;
    }

  /**

  • 读取Excel数据内容

  • @param InputStream

  • @return Map 包含单元格数据内容的Map对象

  • @author zengwendong
    */
    public Map> readExcelContent() throws Exception {
    if (wb == null) {
    throw new Exception("Workbook对象为空！");
    }
    Map> content = new HashMap>();

    sheet = wb.getSheetAt(0);
    // 得到总行数
    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;
    Map cellValue = new HashMap();
    while (j < colNum) {
    Object obj = getCellFormatValue(row.getCell(j));
    cellValue.put(j, obj);
    j++;
    }
    content.put(i, cellValue);
    }
    return content;
    }

  /**

  • 根据Cell类型设置数据

  • @param cell

  • @return

  • @author zengwendong
    */
    private Object getCellFormatValue(Cell cell) {
    Object cellvalue = "";
    if (cell != null) {
    // 判断当前Cell的Type
    switch (cell.getCellType()) {
    case Cell.CELL_TYPE_NUMERIC:// 如果当前Cell的Type为NUMERIC
    case Cell.CELL_TYPE_FORMULA: {
    // 判断当前的cell是否为Date
    if (DateUtil.isCellDateFormatted(cell)) {
    // 如果是Date类型则，转化为Data格式
    // data格式是带时分秒的：2013-7-10 0:00:00
    // cellvalue = cell.getDateCellValue().toLocaleString();
    // data格式是不带带时分秒的：2013-7-10
    Date date = cell.getDateCellValue();
    cellvalue = date;
    } else {// 如果是纯数字

             // 取得当前Cell的数值
             cellvalue = String.valueOf(cell.getNumericCellValue());
         }
         break;
     }
     case Cell.CELL_TYPE_STRING:// 如果当前Cell的Type为STRING
         // 取得当前的Cell字符串
         cellvalue = cell.getRichStringCellValue().getString();
         break;
     default:// 默认的Cell值
         cellvalue = "";
     }
    

    } else {
    cellvalue = "";
    }
    return cellvalue;
    }

  public static void main(String[] args) {
  try {
  String filepath = "F:user.xls";
  ReadExcelUtils excelReader = new ReadExcelUtils(filepath);
  // 对读取Excel表格标题测试
  // String[] title = excelReader.readExcelTitle();
  // System.out.println("获得Excel表格的标题:");
  // for (String s : title) {
  // System.out.print(s + " ");
  // }
  // 对读取Excel表格内容测试
  Map> 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) {
  System.out.println("未找到指定路径的文件!");
  e.printStackTrace();
  } catch (Exception e) {
  e.printStackTrace();
  }
  }