util之ExcelUtil

package com.xxx.util;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.BorderStyle;

public class ExcelUtil {
    public static HSSFCellStyle createCellStyle(HSSFWorkbook wb) {
        HSSFCellStyle cellStyle = wb.createCellStyle();

        cellStyle.setBorderBottom(BorderStyle.THIN); // 底部边框
        cellStyle.setBottomBorderColor(HSSFColor.BLACK.index);// 底部边框颜色

        // cellStyle.setBorderLeft(BorderStyle.MEDIUM_DASH_DOT_DOT); // 左边框
        // cellStyle.setLeftBorderColor(HSSFColor.BLACK.index);// 左边框颜色

        cellStyle.setBorderRight(BorderStyle.THIN);
        cellStyle.setRightBorderColor(HSSFColor.BLACK.index);// 左边框颜色

        // cellStyle.setBorderTop(BorderStyle.MEDIUM_DASH_DOT_DOT);
        // cellStyle.setTopBorderColor(HSSFColor.BLACK.index);// 左边框颜色

        return cellStyle;
    }

    /**
     * @param sheet
     * @param row
     *            如果当前行是空行，则创建当前行
     * @param i
     * @return
     */
    public static HSSFRow getNotNullRow(HSSFSheet sheet, int i) {
        HSSFRow row = sheet.getRow(i);
        if (row == null) {
            row = sheet.createRow(i);
        }
        return row;
    }

    /**
     * @param sheet
     * @param row
     *            如果当格子是空的，则创建当前格子
     * @param i
     * @return
     */
    public static HSSFCell getNotNullCell(HSSFRow row, int i) {
        HSSFCell cell = row.getCell(i);
        if (cell == null) {
            cell = row.createCell(i);
        }

        cell.setCellType(HSSFCell.CELL_TYPE_STRING);
        return cell;
    }

    /**
     * @param sheet
     * @param row
     *            如果当格子是空的，则创建当前格子
     * @param i
     * @return
     */
    public static HSSFCell getNotNullCell(HSSFWorkbook wb, HSSFRow row, int i) {
        HSSFCell cell = row.getCell(i);
        if (cell == null) {
            cell = row.createCell(i);

            HSSFCellStyle cellStyle = createCellStyle(wb);
            cell.setCellStyle(cellStyle);
        }

        cell.setCellType(HSSFCell.CELL_TYPE_STRING);
        return cell;
    }

    /**
     * 获取单元格的值 -不管格子的数据是何类型，自动返回相应的值
     * 
     * @param cell
     * @return
     */
    public static String getCellValue(HSSFCell cell) {
        if (cell == null)
            return "";
        if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
            return cell.getStringCellValue();
        } else if (cell.getCellType() == HSSFCell.CELL_TYPE_BOOLEAN) {
            return String.valueOf(cell.getBooleanCellValue());
        } else if (cell.getCellType() == HSSFCell.CELL_TYPE_FORMULA) {
            return cell.getCellFormula();
        } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
            return String.valueOf(cell.getNumericCellValue());
        }
        return "";
    }

    /**
     * 设置整个sheet每个单元格宽度自适应
     * 
     * @param sheet
     * @throws Exception
     */
    public static void setAutoWith(HSSFSheet sheet) throws Exception {
        int maxColumn = sheet.getPhysicalNumberOfRows();
        // 列宽自适应，只对英文和数字有效
        for (int i = 0; i <= maxColumn; i++) {
            sheet.autoSizeColumn(i);
        }
    }
}