Java读取excel(兼容03和07格式)

读取excel,首先需要下载POI的jar,可以去官网下,也可以在这里下载

一、简单说明

excel2003和excel2007区别比较大,最直观的感受就是扩展名不一样,哈哈

不过,使用POI的API都是面向接口编程的,实际使用起来区别其实不大(知道为什么要面向接口编程了吗?好处就在这里,O(∩_∩)O哈哈~)

代码最直观,直接看代码

 

二、范例

 

package com.hundsun.excel.test;



import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;



import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.Cell;

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;

import org.apache.xmlbeans.impl.piccolo.io.FileFormatException;



public class ReadExcelTest {



    private static final String EXTENSION_XLS = "xls";

    private static final String EXTENSION_XLSX = "xlsx";



    /***

     * <pre>

     * 取得Workbook对象(xls和xlsx对象不同,不过都是Workbook的实现类)

     *   xls:HSSFWorkbook

     *   xlsx:XSSFWorkbook

     * @param filePath

     * @return

     * @throws IOException

     * </pre>

     */

    private Workbook getWorkbook(String filePath) throws IOException {

        Workbook workbook = null;

        InputStream is = new FileInputStream(filePath);

        if (filePath.endsWith(EXTENSION_XLS)) {

            workbook = new HSSFWorkbook(is);

        } else if (filePath.endsWith(EXTENSION_XLSX)) {

            workbook = new XSSFWorkbook(is);

        }

        return workbook;

    }



    /**

     * 文件检查

     * @param filePath

     * @throws FileNotFoundException

     * @throws FileFormatException

     */

    private void preReadCheck(String filePath) throws FileNotFoundException, FileFormatException {

        // 常规检查

        File file = new File(filePath);

        if (!file.exists()) {

            throw new FileNotFoundException("传入的文件不存在:" + filePath);

        }



        if (!(filePath.endsWith(EXTENSION_XLS) || filePath.endsWith(EXTENSION_XLSX))) {

            throw new FileFormatException("传入的文件不是excel");

        }

    }



    /**

     * 读取excel文件内容

     * @param filePath

     * @throws FileNotFoundException

     * @throws FileFormatException

     */

    public void readExcel(String filePath) throws FileNotFoundException, FileFormatException {

        // 检查

        this.preReadCheck(filePath);

        // 获取workbook对象

        Workbook workbook = null;



        try {

            workbook = this.getWorkbook(filePath);

            // 读文件 一个sheet一个sheet地读取

            for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {

                Sheet sheet = workbook.getSheetAt(numSheet);

                if (sheet == null) {

                    continue;

                }

                System.out.println("=======================" + sheet.getSheetName() + "=========================");



                int firstRowIndex = sheet.getFirstRowNum();

                int lastRowIndex = sheet.getLastRowNum();



                // 读取首行 即,表头

                Row firstRow = sheet.getRow(firstRowIndex);

                for (int i = firstRow.getFirstCellNum(); i <= firstRow.getLastCellNum(); i++) {

                    Cell cell = firstRow.getCell(i);

                    String cellValue = this.getCellValue(cell, true);

                    System.out.print(" " + cellValue + "\t");

                }

                System.out.println("");



                // 读取数据行

                for (int rowIndex = firstRowIndex + 1; rowIndex <= lastRowIndex; rowIndex++) {

                    Row currentRow = sheet.getRow(rowIndex);// 当前行

                    int firstColumnIndex = currentRow.getFirstCellNum(); // 首列

                    int lastColumnIndex = currentRow.getLastCellNum();// 最后一列

                    for (int columnIndex = firstColumnIndex; columnIndex <= lastColumnIndex; columnIndex++) {

                        Cell currentCell = currentRow.getCell(columnIndex);// 当前单元格

                        String currentCellValue = this.getCellValue(currentCell, true);// 当前单元格的值

                        System.out.print(currentCellValue + "\t");

                    }

                    System.out.println("");

                }

                System.out.println("======================================================");

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            if (workbook != null) {

                try {

                    workbook.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

    }



    /**

     * 取单元格的值

     * @param cell 单元格对象

     * @param treatAsStr 为true时,当做文本来取值 (取到的是文本,不会把“1”取成“1.0”)

     * @return

     */

    private String getCellValue(Cell cell, boolean treatAsStr) {

        if (cell == null) {

            return "";

        }



        if (treatAsStr) {

            // 虽然excel中设置的都是文本,但是数字文本还被读错,如“1”取成“1.0”

            // 加上下面这句,临时把它当做文本来读取

            cell.setCellType(Cell.CELL_TYPE_STRING);

        }



        if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {

            return String.valueOf(cell.getBooleanCellValue());

        } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {

            return String.valueOf(cell.getNumericCellValue());

        } else {

            return String.valueOf(cell.getStringCellValue());

        }

    }



}

 

三、其他

本人在Excel2010上试的时候,excel中明明设置的都是文本类型,但是读取的时候,把数字“1”读成“1.0”

所以在getCellValue()方法中,把cell单元格的式样改了一下,确保数字“1”文本读出来还是“1”

 

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