java读取Excel工具类

来源:互联网 发布:对冲平仓 知乎 编辑:程序博客网 时间:2024/06/05 00:44

分享一个想将Excel导入数据库的工具类,各位猿友可以直接用

 

import java.beans.IntrospectionException;import java.beans.PropertyDescriptor;import java.io.InputStream;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.math.BigDecimal;import java.text.DecimalFormat;import java.text.NumberFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Map;import org.apache.poi.hssf.usermodel.HSSFCell;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.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.ss.util.CellRangeAddress;import org.apache.poi.xssf.usermodel.XSSFCell;import org.apache.poi.xssf.usermodel.XSSFCellStyle;import org.apache.poi.xssf.usermodel.XSSFFont;import org.apache.poi.xssf.usermodel.XSSFRow;import org.apache.poi.xssf.usermodel.XSSFSheet;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import com.luo.domain.ExcelBean;public class ExcelUtil { private final static String excel2003L =".xls";    //2003- 版本的excel    private final static String excel2007U =".xlsx";   //2007+ 版本的excel    /**     * Excel导入     */    public static  List> getBankListByExcel(InputStream in, String fileName) throws Exception{        List> list = null;        //创建Excel工作薄        Workbook work = getWorkbook(in,fileName);        if(null == work){            throw new Exception("创建Excel工作薄为空!");        }        Sheet sheet = null;        Row row = null;        Cell cell = null;        list = new ArrayList>();        //遍历Excel中所有的sheet        for (int i = 0; i < work.getNumberOfSheets(); i++) {            sheet = work.getSheetAt(i);            if(sheet==null){continue;}            //遍历当前sheet中的所有行            //包涵头部,所以要小于等于最后一列数,这里也可以在初始值加上头部行数,以便跳过头部            for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {                //读取一行                row = sheet.getRow(j);                //去掉空行和表头                if(row==null||row.getFirstCellNum()==j){continue;}                //遍历所有的列                List li = new ArrayList();                for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {                    cell = row.getCell(y);                    li.add(getCellValue(cell));                }                list.add(li);            }        }        return list;    }    /**     * 描述:根据文件后缀,自适应上传文件的版本     */    public static  Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{        Workbook wb = null;        String fileType = fileName.substring(fileName.lastIndexOf("."));        if(excel2003L.equals(fileType)){            wb = new HSSFWorkbook(inStr);  //2003-        }else if(excel2007U.equals(fileType)){            wb = new XSSFWorkbook(inStr);  //2007+        }else{            throw new Exception("解析的文件格式有误!");        }        return wb;    }    /**     * 描述:对表格中数值进行格式化     */    public static  Object getCellValue(Cell cell){        Object value = null;        DecimalFormat df = new DecimalFormat("0");  //格式化字符类型的数字        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  //日期格式化        DecimalFormat df2 = new DecimalFormat("0.00");  //格式化数字        switch (cell.getCellType()) {            case Cell.CELL_TYPE_STRING:                value = cell.getRichStringCellValue().getString();                break;            case Cell.CELL_TYPE_NUMERIC:                if("General".equals(cell.getCellStyle().getDataFormatString())){                    value = df.format(cell.getNumericCellValue());                }else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){                    value = sdf.format(cell.getDateCellValue());                }else{                    value = df2.format(cell.getNumericCellValue());                }                break;            case Cell.CELL_TYPE_BOOLEAN:                value = cell.getBooleanCellValue();                break;            case Cell.CELL_TYPE_BLANK:                value = "";                break;            default:                break;        }        return value;    }    /**     * 导入Excel表结束     * 导出Excel表开始     * @param sheetName 工作簿名称     * @param clazz  数据源model类型     * @param objs   excel标题列以及对应model字段名     * @param map  标题列行数以及cell字体样式     */    public static XSSFWorkbook createExcelFile(Class clazz, List objs, Map> map, String sheetName) throws IllegalArgumentException,IllegalAccessException,InvocationTargetException,ClassNotFoundException, IntrospectionException, ParseException {        // 创建新的Excel工作簿        XSSFWorkbook workbook = new XSSFWorkbook();        // 在Excel工作簿中建一工作表,其名为缺省值, 也可以指定Sheet名称        XSSFSheet sheet = workbook.createSheet(sheetName);        // 以下为excel的字体样式以及excel的标题与内容的创建,下面会具体分析;        createFont(workbook); //字体样式        createTableHeader(sheet, map); //创建标题(头)        createTableRows(sheet, map, objs, clazz); //创建内容        return workbook;    }    private static XSSFCellStyle fontStyle;    private static XSSFCellStyle fontStyle2;    public static void createFont(XSSFWorkbook workbook) {        // 表头        fontStyle = workbook.createCellStyle();        XSSFFont font1 = workbook.createFont();        font1.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);        font1.setFontName("黑体");        font1.setFontHeightInPoints((short) 14);// 设置字体大小        fontStyle.setFont(font1);        fontStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框        fontStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);// 左边框        fontStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);// 上边框        fontStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);// 右边框        fontStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 居中        // 内容        fontStyle2=workbook.createCellStyle();        XSSFFont font2 = workbook.createFont();        font2.setFontName("宋体");        font2.setFontHeightInPoints((short) 10);// 设置字体大小        fontStyle2.setFont(font2);        fontStyle2.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框        fontStyle2.setBorderLeft(XSSFCellStyle.BORDER_THIN);// 左边框        fontStyle2.setBorderTop(XSSFCellStyle.BORDER_THIN);// 上边框        fontStyle2.setBorderRight(XSSFCellStyle.BORDER_THIN);// 右边框        fontStyle2.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 居中    }    /**     * 根据ExcelMapping 生成列头(多行列头)     *     * @param sheet 工作簿     * @param map 每行每个单元格对应的列头信息     */    public static final void createTableHeader(XSSFSheet sheet, Map> map) {        int startIndex=0;//cell起始位置        int endIndex=0;//cell终止位置        for (Map.Entry> entry : map.entrySet()) {            XSSFRow row = sheet.createRow(entry.getKey());            List excels = entry.getValue();            for (int x = 0; x < excels.size(); x++) {                //合并单元格                if(excels.get(x).getCols()>1){                    if(x==0){                        endIndex+=excels.get(x).getCols()-1;                        CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex);                        sheet.addMergedRegion(range);                        startIndex+=excels.get(x).getCols();                    }else{                        endIndex+=excels.get(x).getCols();                        CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex);                        sheet.addMergedRegion(range);                        startIndex+=excels.get(x).getCols();                    }                    XSSFCell cell = row.createCell(startIndex-excels.get(x).getCols());                    cell.setCellValue(excels.get(x).getHeadTextName());// 设置内容                    if (excels.get(x).getCellStyle() != null) {                        cell.setCellStyle(excels.get(x).getCellStyle());// 设置格式                    }                    cell.setCellStyle(fontStyle);                }else{                    XSSFCell cell = row.createCell(x);                    cell.setCellValue(excels.get(x).getHeadTextName());// 设置内容                    if (excels.get(x).getCellStyle() != null) {                        cell.setCellStyle(excels.get(x).getCellStyle());// 设置格式                    }                    cell.setCellStyle(fontStyle);                }            }        }    }    public static void createTableRows(XSSFSheet sheet, Map> map, List objs, Class clazz)            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IntrospectionException,            ClassNotFoundException, ParseException {        int rowindex = map.size();        int maxKey = 0;        List ems = new ArrayList();        for (Map.Entry> entry : map.entrySet()) {            if (entry.getKey() > maxKey) {                maxKey = entry.getKey();            }        }        ems = map.get(maxKey);        List widths = new ArrayList(ems.size());        for (Object obj : objs) {            XSSFRow row = sheet.createRow(rowindex);            for (int i = 0; i < ems.size(); i++) {                ExcelBean em = (ExcelBean) ems.get(i);                // 获得get方法                PropertyDescriptor pd = new PropertyDescriptor(em.getPropertyName(), clazz);                Method getMethod = pd.getReadMethod();                Object rtn = getMethod.invoke(obj);                String value = "";                // 如果是日期类型进行转换                if (rtn != null) {                    if (rtn instanceof Date) {                        value = DateUtils.dateToString((Date)rtn);                    } else if(rtn instanceof BigDecimal){                        NumberFormat nf = new DecimalFormat("#,##0.00");                        value=nf.format((BigDecimal)rtn).toString();                    } else if((rtn instanceof Integer) && (Integer.valueOf(rtn.toString())<0 )){                        value="--";                    }else {                        value = rtn.toString();                    }                }                XSSFCell cell = row.createCell(i);                cell.setCellValue(value);                cell.setCellType(XSSFCell.CELL_TYPE_STRING);                cell.setCellStyle(fontStyle2);                // 获得最大列宽                int width = value.getBytes().length * 300;                // 还未设置,设置当前                if (widths.size() <= i) {                    widths.add(width);                    continue;                }                // 比原来大,更新数据                if (width > widths.get(i)) {                    widths.set(i, width);                }            }            rowindex++;        }        // 设置列宽        for (int index = 0; index < widths.size(); index++) {            Integer width = widths.get(index);            width = width < 2500 ? 2500 : width + 300;            width = width > 10000 ? 10000 + 300 : width + 300;            sheet.setColumnWidth(index, width);        }    }}

原创粉丝点击