Java excel文件读取

　　excel文件读取

　　方法一

import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.StringUtils;
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.xssf.usermodel.XSSFWorkbook;

public class ImportExcelUtil {
     private final static String excel2003L =".xls";    //2003- 版本的excel  
        private final static String excel2007U =".xlsx";   //2007+ 版本的excel  
          
        /** 
         * 描述：获取IO流中的数据，组装成List<List<Object>>对象 
         * @param in,fileName 
         * @return 
         * @throws IOException  
         */  
        public  List<List<Object>> getBankListByExcel(InputStream in,String fileName) throws Exception{  
            List<List<Object>> list = null;  
            
            //创建Excel工作薄  
            Workbook work = this.getWorkbook(in,fileName);  
            if(null == work){  
                throw new Exception("创建Excel工作薄为空！");  
            }
            list = new ArrayList<List<Object>>();  
            
            String fileType = fileName.substring(fileName.lastIndexOf("."));  
            if(excel2003L.equals(fileType)){  
                HSSFRow row = null;
                HSSFSheet sheet = null;  
                HSSFCell cell = null; 
                
              //遍历Excel中所有的sheet  
                for (int i = 0; i < work.getNumberOfSheets(); i++) {  
                    sheet = (HSSFSheet) work.getSheetAt(i);  
                    if(sheet==null){continue;}  
                      
                    //遍历当前sheet中的所有行  
                    int cells = sheet.getRow(0).getLastCellNum();
                    
                    int rows = sheet.getLastRowNum();
                    for (int j = 1; j <= rows; j++) {
                        row = sheet.getRow(j);  
                        
                        if(row==null  || isBlankRow(row)){continue;}  
                        //遍历所有的单元格  
                        List<Object> li = new ArrayList<Object>(); 
                        for (int y = 0; y < cells; y++) {
                            cell = row.getCell(y);  
                            if(StringUtils.isNotEmpty(cell == null ? "" : cell.toString())){
                                li.add(this.getCellValue(cell));  
                            }else{
                                li.add("");  
                            }
                        }  
                        list.add(li);  
                    }  
                }  
            }else if(excel2007U.equals(fileType)){  
                Sheet sheet = null;  
                 Row row = null;  
                 Cell cell = null;  
              //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  
                    int rows = sheet.getLastRowNum();
                    for (int j = 1; j <= rows; j++) {
                        row = sheet.getRow(j);  
                        if(row==null){continue;}  
                        //遍历所有的单元格  
                        List<Object> li = new ArrayList<Object>(); 
                        int cells = row.getLastCellNum();
                        for (int y = 0; y < cells; y++) {  
                            cell = row.getCell(y);  
                            if(StringUtils.isNotEmpty(cell == null ? "" : cell.toString())){
                                li.add(this.getCellValue(cell));  
                            }else{
                                li.add("");  
                            }
                        }  
                        list.add(li);  
                    }  
                }  
            }
            return list;  
        }
        
        public static boolean isBlankRow(HSSFRow row){
            if(row == null) return true;
            boolean result = true;
            for(int i = row.getFirstCellNum(); i < row.getLastCellNum(); i++){
                HSSFCell cell = row.getCell(i, HSSFRow.RETURN_BLANK_AS_NULL);
                String value = "";
                if(cell != null){
                    switch (cell.getCellType()) {
                    case Cell.CELL_TYPE_STRING:
                        value = cell.getStringCellValue();
                        break;
                    case Cell.CELL_TYPE_NUMERIC:
                        value = String.valueOf((int) cell.getNumericCellValue());
                        break;
                    case Cell.CELL_TYPE_BOOLEAN:
                        value = String.valueOf(cell.getBooleanCellValue());
                        break;
                    case Cell.CELL_TYPE_FORMULA:
                        value = String.valueOf(cell.getCellFormula());
                        break;
                    //case Cell.CELL_TYPE_BLANK:
                    //    break;
                    default:
                        break;
                    }
                     
                    if(!value.trim().equals("")){
                        result = false;
                        break;
                    }
                }
            }
            return result;
        }
          
        /** 
         * 描述：根据文件后缀，自适应上传文件的版本  
         * @param inStr,fileName 
         * @return 
         * @throws Exception 
         */  
        public  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 
         * @param cell 
         * @return 
         */  
        public  Object getCellValue(Cell cell){  
            Object value = null;  
            DecimalFormat df = new DecimalFormat("0");  //格式化number String字符  
            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;  
        }  
          
}

 　　方法二

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
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.usermodel.WorkbookFactory;

public class ExcelReader {
    Workbook wb = null;

    public Workbook getWb() {
        return wb;
    }

    public void setWb(Workbook wb) {
        this.wb = wb;
    }

    List<String[]> dataList = new ArrayList<String[]>(100);

    public ExcelReader(String path) {
        try {
            createWorkbook(new FileInputStream(path));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public ExcelReader(FileInputStream fs) {
        createWorkbook(fs);
    }

    private void createWorkbook(FileInputStream fs) {
        try {
            InputStream inp = fs;
            wb = WorkbookFactory.create(inp);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (InvalidFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 取Excel所有数据，包含header
     * 
     * @return List<String[]>
     */
    public List<String[]> getAllData(int sheetIndex, boolean isOnlyReadHeader) {
        int columnNum = 0;
        Sheet sheet = wb.getSheetAt(sheetIndex);
        if (sheet.getRow(0) != null) {
            columnNum = sheet.getRow(0).getLastCellNum() - sheet.getRow(0).getFirstCellNum();
        }
        if (columnNum > 0) {
            for (Row row : sheet) {
                String[] singleRow = new String[columnNum];
                int n = 0;
                for (int i = 0; i < columnNum; i++) {
                    Cell cell = row.getCell(i, Row.CREATE_NULL_AS_BLANK);
                    switch (cell.getCellType()) {
                    case Cell.CELL_TYPE_BLANK:
                        singleRow[n] = "";
                        break;
                    case Cell.CELL_TYPE_BOOLEAN:
                        singleRow[n] = Boolean.toString(cell.getBooleanCellValue());
                        break;
                    // 数值
                    case Cell.CELL_TYPE_NUMERIC:
                        if (DateUtil.isCellDateFormatted(cell)) {
                            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                            // singleRow[n] = String.valueOf(cell
                            // .getDateCellValue());
                            singleRow[n] = sdf.format(cell.getDateCellValue());
                        } else {
                            cell.setCellType(Cell.CELL_TYPE_STRING);
                            String temp = cell.getStringCellValue();
                            // 判断是否包含小数点，如果不含小数点，则以字符串读取，如果含小数点，则转换为Double类型的字符串
                            if (temp.indexOf(".") > -1) {
                                singleRow[n] = String.valueOf(new Double(temp)).trim();
                            } else {
                                singleRow[n] = temp.trim();
                            }
                        }
                        break;
                    case Cell.CELL_TYPE_STRING:
                        singleRow[n] = cell.getStringCellValue().trim();
                        break;
                    case Cell.CELL_TYPE_ERROR:
                        singleRow[n] = "";
                        break;

                    case Cell.CELL_TYPE_FORMULA:
                        cell.setCellType(Cell.CELL_TYPE_STRING);
                        singleRow[n] = cell.getStringCellValue();
                        if (singleRow[n] != null) {
                            singleRow[n] = singleRow[n].replaceAll("#N/A", "").trim();
                        }
                        break;
                    default:
                        singleRow[n] = "";
                        break;
                    }
                    n++;
                }
                if ("".equals(singleRow[0])) {
                    Boolean isAllEmpty = true;
                    for (String str : singleRow) {
                        if (StringUtils.isNotBlank(str)) {
                            isAllEmpty = false;
                            break;
                        }
                    }
                    if (isAllEmpty) {
                        continue;
                    }
                } // 如果第一行为空，跳过
                dataList.add(singleRow);
                if (isOnlyReadHeader) {
                    break;
                }
            }
        }
        return dataList;
    }

    /**
     * 返回Excel最大行index值，实际行数要加1
     * 
     * @return
     */
    public int getRowNum(int sheetIndex) {
        Sheet sheet = wb.getSheetAt(sheetIndex);
        return sheet.getLastRowNum();
    }

    /**
     * 返回数据的列数
     * 
     * @return
     */
    public int getColumnNum(int sheetIndex) {
        Sheet sheet = wb.getSheetAt(sheetIndex);
        Row row = sheet.getRow(0);
        if (row != null && row.getLastCellNum() > 0) {
            return row.getLastCellNum();
        }
        return 0;
    }

    /**
     * 获取某一行数据
     * 
     * @param rowIndex
     *            计数从0开始，rowIndex为0代表header行
     * @return
     */
    public String[] getRowData(int sheetIndex, int rowIndex) {
        if (rowIndex > this.getColumnNum(sheetIndex)) {
            return null;
        } else {
            return this.dataList.get(rowIndex);
        }

    }

    /**
     * 获取某一列数据
     * 
     * @param colIndex
     * @return
     */
    public String[] getColumnData(int sheetIndex, int colIndex) {
        String[] dataArray = null;
        if (colIndex > this.getColumnNum(sheetIndex)) {
            return dataArray;
        } else {
            if (this.dataList != null && this.dataList.size() > 0) {
                dataArray = new String[this.getRowNum(sheetIndex) + 1];
                int index = 0;
                for (String[] rowData : dataList) {
                    if (rowData != null) {
                        dataArray[index] = rowData[colIndex];
                        index++;
                    }
                }
            }
        }
        return dataArray;

    }
}