excel表格导入数据库后台JAVA方法

1.判断文件类型

public class ReadExcal {
    /**
     * 对外提供读取excel 的方法
     * */
    public List> readExcel(File file) throws IOException {
        String fileName = file.getName();
        System.out.println("文件名:"+fileName);
        String extension = fileName.lastIndexOf(".") == -1 ? "" : fileName
                .substring(fileName.lastIndexOf(".") + 1);
        System.out.println("文件类型:"+extension);
        if ("xls".equals(extension)) {
            return read2003Excel(file);
        } else if ("xlsx".equals(extension)) {
            return read2007Excel(file);
        } else {
            throw new IOException("不支持的文件类型");
        }
    }
2.版本是否正确

 public static Workbook create(InputStream inp) throws IOException,InvalidFormatException {
        if (!inp.markSupported()) {
            inp = new PushbackInputStream(inp, 8);
        }
        if (POIFSFileSystem.hasPOIFSHeader(inp)) {
            return new HSSFWorkbook(inp);
        }
        if (POIXMLDocument.hasOOXMLHeader(inp)) {
            return new XSSFWorkbook(OPCPackage.open(inp));
        }
        throw new IllegalArgumentException("你的excel版本目前poi解析不了");
    }



3.不同类型对应方法

 /**
     * 读取 office 2003 excel
     * 
     * @throws IOException
     * @throws FileNotFoundException
     */
    private static List> read2003Excel(File file)
            throws IOException {
        List> list = new LinkedList>();
        Workbook hwb=null;
		try {
			hwb = create(new FileInputStream(file));
		} catch (InvalidFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
       
        //HSSFWorkbook hwb = new HSSFWorkbook(new FileInputStream(file));
        //表单里的第几张表
        int size=hwb.getNumberOfSheets();
        for(int k=0;k linked = new LinkedList();
            for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                cell = row.getCell(j);
                if (cell == null) {
                    continue;
                }
                DecimalFormat df = new DecimalFormat("0");// 格式化 number String
                                                            // 字符
                SimpleDateFormat sdf = new SimpleDateFormat(
                        "yyyy-MM-dd");// 格式化日期字符串
                DecimalFormat nf = new DecimalFormat("0.00");// 格式化数字
                switch (cell.getCellType()) {
                case XSSFCell.CELL_TYPE_STRING:
                //  System.out.println(i + "行" + j + " 列 is String type");
                    value = cell.getStringCellValue();
                    break;
                case XSSFCell.CELL_TYPE_NUMERIC:
                    /*System.out.println(i + "行" + j
                            + " 列 is Number type ; DateFormt:"
                            + cell.getCellStyle().getDataFormatString());*/
                    if ("@".equals(cell.getCellStyle().getDataFormatString())) {
                        value = df.format(cell.getNumericCellValue());
                    } else if ("General".equals(cell.getCellStyle()
                            .getDataFormatString())) {
                        value = nf.format(cell.getNumericCellValue());
                    } else {
                        value = sdf.format(HSSFDateUtil.getJavaDate(cell
                                .getNumericCellValue()));
                    }
                    break;
                case XSSFCell.CELL_TYPE_BOOLEAN:
                //  System.out.println(i + "行" + j + " 列 is Boolean type");
                    value = cell.getBooleanCellValue();
                    break;
                case XSSFCell.CELL_TYPE_BLANK:
                //  System.out.println(i + "行" + j + " 列 is Blank type");
                    value = "";
                    break;
                default:
                //  System.out.println(i + "行" + j + " 列 is default type");
                    value = cell.toString();
                }
                if (value == null || "".equals(value)) {
                    continue;
                }
                linked.add(value);
            }
            list.add(linked);
        }
        }
        return list;
    } 
  
/**
     * 读取Office 2007 excel
     * */
    private static List> read2007Excel(File file)
            throws IOException {
    	System.out.println("进入2007excel");
    	 List> list=null;
    	 Workbook xwb=null;
    	 Sheet sheet=null;
   
    	try{
    			list = new LinkedList>();
    	        // 构造 XSSFWorkbook 对象,strPath 传入文件路径
    			//(jdk版本是否大于1.6.0_18,若没有,则会在new XSSFWorkbook()时报错)
    	        //xwb = new XSSFWorkbook(new FileInputStream(file));
    			
    			xwb=create(new FileInputStream(file));
    	        // 读取第一章表格内容
    	      
    	}catch(Exception e){
    		System.out.println(e);
    	}
    	System.out.println(list.size()+"-"+xwb.getNumberOfSheets());
    	 for( int o=0;o linked = new LinkedList();
            for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                cell = row.getCell(j);
                if (cell == null) {
                    continue;
                }
                DecimalFormat df = new DecimalFormat("0");// 格式化 number String
                                                            // 字符
                SimpleDateFormat sdf = new SimpleDateFormat(
                        "yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
                DecimalFormat nf = new DecimalFormat("0.00");// 格式化数字
                switch (cell.getCellType()) {
                case XSSFCell.CELL_TYPE_STRING:
                    System.out.println(i + "行" + j + " 列 is String type");
                    value = cell.getStringCellValue();
                    break;
                case XSSFCell.CELL_TYPE_NUMERIC:
                /*  System.out.println(i + "行" + j
                            + " 列 is Number type ; DateFormt:"
                            + cell.getCellStyle().getDataFormatString());*/
                    if ("@".equals(cell.getCellStyle().getDataFormatString())) {
                        value = df.format(cell.getNumericCellValue());
                    } else if ("General".equals(cell.getCellStyle()
                            .getDataFormatString())) {
                        value = nf.format(cell.getNumericCellValue());
                    } else {
                        /*value = sdf.format(HSSFDateUtil.getJavaDate(cell
                                .getNumericCellValue()));*/
                    }
                    break;
                case XSSFCell.CELL_TYPE_BOOLEAN:
            //      System.out.println(i + "行" + j + " 列 is Boolean type");
                    value = cell.getBooleanCellValue();
                    break;
                case XSSFCell.CELL_TYPE_BLANK:
                //  System.out.println(i + "行" + j + " 列 is Blank type");
                    value = "";
                    break;
                default:
                //  System.out.println(i + "行" + j + " 列 is default type");
                    value = cell.toString();
                }
                if (value == null || "".equals(value)) {
                    continue;
                }
                linked.add(value);
            }
            list.add(linked);
        }
    }
    	 System.out.println("size:"+list.size());
        return list;
    }