Java解析excel表格

第一步：引入相关依赖

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.2</version>
</dependency>

第二步：工具类

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ImportExcel
{

    /** 总行数 */

    private int totalRows = 0;

    /** 总列数 */

    private int totalCells = 0;

    /** 错误信息 */

    private String errorInfo;

    public int getTotalRows()
    {
        return totalRows;
    }

    public void setTotalRows(int totalRows)
    {
        this.totalRows = totalRows;
    }

    public int getTotalCells()
    {
        return totalCells;
    }

    public void setTotalCells(int totalCells)
    {
        this.totalCells = totalCells;
    }

    public String getErrorInfo()
    {
        return errorInfo;
    }

    public void setErrorInfo(String errorInfo)
    {
        this.errorInfo = errorInfo;
    }
    /** 构造方法 */

    public ImportExcel()
    {

    }
    /**
     *
     * @描述：是否是2003的excel，返回true是2003
     *
     * @参数：@param filePath　文件完整路径
     *
     * @参数：@return
     *
     * @返回值：boolean
     */

    public static boolean isExcel2003(String filePath)
    {
        return filePath.matches("^.+\\.(?i)(xls)$");
    }

    /**
     *
     * @描述：是否是2007的excel，返回true是2007
     *
     * @参数：@param filePath　文件完整路径
     *
     * @参数：@return
     *
     * @返回值：boolean
     */

    public static boolean isExcel2007(String filePath)
    {
        return filePath.matches("^.+\\.(?i)(xlsx)$");
    }

    public static boolean isCSV(String filePath)
    {
        return filePath.matches("^.+\\.(?i)(csv)$");
    }

    public static boolean isTxt(String filePath)
    {
        return filePath.matches("^.+\\.(?i)(txt)$");
    }

    /**
     *
     * @描述：验证excel文件
     *
     * @参数：@param filePath　文件完整路径
     *
     * @参数：@return
     *
     * @返回值：boolean
     */

    public boolean validateExcel(String filePath)
    {

        /** 检查文件名是否为空或者是否是Excel格式的文件 */

        if (filePath == null || !(ImportExcel.isExcel2003(filePath) || ImportExcel.isExcel2007(filePath) ))
        {
            errorInfo = "文件名不是excel格式";
            return false;

        }
        return true;
    }

    public List read(String filePath, Class cla, Integer sheetNo,Integer startRow)
    {
        try
        {
            if( startRow == null){
                startRow = 1;
            }
            List<Object> listObjects = new ArrayList<Object>();
            List<List<String>> list = read(filePath,sheetNo, startRow);
            Constructor[] constructors = cla.getDeclaredConstructors();
            Constructor<?> constructor = null;
            for (Constructor<?> item : constructors)
            {
                if (item.getParameterTypes().length == 1)//获取一个参数的构造方法
                {
                    constructor = item;
                }
            }
            if (list != null)
            {
                for (int i = 0; i < list.size(); i++)
                {
                    Object p = cla.newInstance();
                    List<String> cellList = list.get(i);
                    p = constructor.newInstance(cellList);
                    listObjects.add(p);
                }
            }
            return listObjects;
        }
        catch (InstantiationException e)
        {
            e.printStackTrace();
            errorInfo = "解析excel数据出现错误";
            return null;
        }
        catch (IllegalArgumentException e)
        {
            e.printStackTrace();
            errorInfo = "解析excel数据出现错误";
            return null;
        }
        catch (IllegalAccessException e)
        {
            e.printStackTrace();
            errorInfo = "解析excel数据出现错误";
            return null;
        }
        catch (InvocationTargetException e)
        {
            e.printStackTrace();
            errorInfo = "excel文件模版错误";
            return null;
        }
        catch (SecurityException e)
        {
            e.printStackTrace();
            errorInfo = "解析excel数据出现错误";
            return null;
        }
    }
    /**
     *
     * @描述：根据文件名读取excel文件
     *
     * @参数：@param filePath 文件完整路径
     *
     * @参数：@return
     *
     * @返回值：List
     */

    public List<List<String>> read(String filePath, Integer sheetNo,Integer startRow)
    {

        List<List<String>> dataLst = new ArrayList<List<String>>();

        InputStream is = null;

        try
        {
            /** 验证文件是否合法 */
            if (!validateExcel(filePath))
            {
                System.out.println(errorInfo);
                return null;
            }

            /** 判断文件的类型，是2003还是2007 */

            boolean isExcel2003 = true;

            if (ImportExcel.isExcel2007(filePath))
            {

                isExcel2003 = false;

            }

            /** 调用本类提供的根据流读取的方法 */

            File file = new File(filePath);

            is = new FileInputStream(file);

            dataLst = read(is, isExcel2003, sheetNo, startRow);

            is.close();

        }
        catch (Exception ex)
        {

            ex.printStackTrace();

        }
        finally
        {

            if (is != null)
            {

                try
                {

                    is.close();

                }
                catch (IOException e)
                {

                    is = null;

                    e.printStackTrace();

                }

            }

        }

        /** 返回最后读取的结果 */

        return dataLst;
    }

    /**
     *
     * @描述：根据流读取Excel文件
     *
     * @参数：@param inputStream
     *
     * @参数：@param isExcel2003
     *
     * @参数：@return
     *
     * @返回值：List
     */

    public List<List<String>> read(InputStream inputStream, boolean isExcel2003, Integer sheetNo,Integer startRow)
    {

        List<List<String>> dataLst = null;

        try
        {

            /** 根据版本选择创建Workbook的方式 */

            Workbook wb = null;

            if (isExcel2003)
            {
                wb = new HSSFWorkbook(inputStream);
            }
            else
            {
                wb = new XSSFWorkbook(inputStream);
            }
            dataLst = read(wb, sheetNo, startRow);

        }
        catch (IOException e)
        {

            e.printStackTrace();

        }

        return dataLst;

    }

    /**
     *
     * @描述：读取数据
     *
     * @参数：@param Workbook
     *
     * @参数：@param sheetNo
     *
     * @参数：@return
     *
     * @返回值：List<List<String>>
     */

    private List<List<String>> read(Workbook wb, Integer sheetNo,Integer startRow)
    {

        List<List<String>> dataLst = new ArrayList<List<String>>();

        /** 得到第一个shell */
        Sheet sheet = null;
        if(sheetNo == null){
            sheet = wb.getSheetAt(0);
        }else{
            sheet = wb.getSheetAt(sheetNo.intValue());
        }

        /** 得到Excel的行数 */

        this.totalRows = sheet.getPhysicalNumberOfRows();

        /** 得到Excel的列数 */

        if (this.totalRows >= 1 && sheet.getRow(startRow) != null)
        {

            this.totalCells = sheet.getRow(startRow).getPhysicalNumberOfCells();

        }

        /** 循环Excel的行 */

        for (int r = startRow; r < this.totalRows; r++)
        {

            Row row = sheet.getRow(r);

            if (row == null)
            {

                continue;

            }

            List<String> rowLst = new ArrayList<String>();

            /** 循环Excel的列 */

            for (int c = 0; c < this.getTotalCells(); c++)
            {

                Cell cell = row.getCell(c);

                String cellValue = "";

                if (null != cell)
                {
                    // 以下是判断数据的类型
                    switch (cell.getCellType())
                    {
                        case NUMERIC: // 数字
                            cellValue = String.valueOf(cell.getNumericCellValue());
                            break;

                        case STRING: // 字符串
                            cellValue = cell.getStringCellValue();
                            break;

                        case BOOLEAN: // Boolean
                            cellValue = cell.getBooleanCellValue() + "";
                            break;

                        case FORMULA: // 公式
                            cellValue = cell.getCellFormula() + "";
                            break;

                        case BLANK: // 空值
                            cellValue = "";
                            break;

                        case ERROR: // 故障
                            cellValue = "非法字符";
                            break;
                        default:
                            cellValue = "未知类型";
                            break;
                    }
                }

                rowLst.add(cellValue);

            }

            /** 保存第r行的第c列 */

            dataLst.add(rowLst);

        }

        return dataLst;

    }

}

第三步：运行

/**
     *
     * @描述：main测试方法
     *
     * @参数：@param args
     *
     * @参数：@throws Exception
     *
     * @返回值：void
     */
public static void main(String[] args) throws Exception
    {

        ImportExcel poi = new ImportExcel();
        List<List<String>> list = poi.read("/Users/zhuangjy/Desktop/test.xlsx",1,0);

        if (list != null) {
            for (int i = 0; i < list.size(); i++) {
                System.out.print("第" + (i) + "行");
                List<String> cellList = list.get(i);
                for (int j = 0; j < cellList.size(); j++) {
                    System.out.print("    " + cellList.get(j));
                }
                System.out.println();
            }
        }
    }

效果截图

本文地址：https://blog.csdn.net/qq_39019865/article/details/110160991