Java poi 读写excel工具类

java poi

依赖

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.14</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.14</version>
</dependency>

WorkbookUtils.java

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
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.ss.util.WorkbookUtil;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.tomcat.util.http.fileupload.IOUtils;
public class WorkbookUtils extends WorkbookUtil {
    // 读取excel文件
    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();
        } finally {
            IOUtils.closeQuietly(is);
        }
        return wb;
    }
    //读取单元格
    public static Object getCellFormatValue(Cell cell, FormulaEvaluator formulaEvaluator) {
        if (cell == null) {
            return null;
        }
        Object cellValue = null;
        // 判断cell类型
        int cellType = cell.getCellType();
        if (cellType == Cell.CELL_TYPE_FORMULA) {
            cellType = formulaEvaluator.evaluateFormulaCell(cell);
        }
        switch (cellType) {
        case Cell.CELL_TYPE_STRING:
            cellValue = cell.getRichStringCellValue().getString();
            break;
        case Cell.CELL_TYPE_NUMERIC:
            if (DateUtil.isCellDateFormatted(cell)) {// 判断cell是否为日期格式
                cellValue = cell.getDateCellValue();
                break;
            }
            DataFormatter dataFormatter = new DataFormatter();
            cellValue = dataFormatter.formatCellValue(cell, formulaEvaluator);
            break;
        case Cell.CELL_TYPE_BOOLEAN:
            cellValue = cell.getBooleanCellValue();
            break;
        default:
            cellValue = "";
        }
        return cellValue;
    }
    // 设置报表头样式
    public static CellStyle createHeadSytle(Workbook workbook) {
        CellStyle style1 = workbook.createCellStyle();// cell样式
        // 设置单元格背景色，设置单元格背景色以下两句必须同时设置
        style1.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);// 设置填充样式
        style1.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);// 设置填充色
        // 设置单元格上、下、左、右的边框线
        style1.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style1.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style1.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style1.setBorderTop(HSSFCellStyle.BORDER_THIN);
        Font font1 = workbook.createFont();// 创建一个字体对象
        font1.setBoldweight((short) 10);// 设置字体的宽度
        font1.setFontHeightInPoints((short) 10);// 设置字体的高度
        font1.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 粗体显示
        style1.setFont(font1);// 设置style1的字体
        // style1.setWrapText(true);// 设置自动换行
        style1.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置单元格字体显示居中（左右方向）
        style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 设置单元格字体显示居中(上下方向)
        return style1;
    }
    // 设置报表体样式
    public static CellStyle createCellStyle(Workbook wb) {
        // 设置style1的样式，此样式运用在第二行
        CellStyle style1 = wb.createCellStyle();// cell样式
        // 设置单元格上、下、左、右的边框线
        style1.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style1.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style1.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style1.setBorderTop(HSSFCellStyle.BORDER_THIN);
        // style1.setWrapText(true);// 设置自动换行
        style1.setAlignment(HSSFCellStyle.ALIGN_LEFT);// 设置单元格字体显示居中（左右方向）
        style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 设置单元格字体显示居中(上下方向)
        return style1;
    }
}