Excel 读取并解密

package com;
/**
*
*/


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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.xssf.usermodel.XSSFWorkbook;

import com.utils.CryptDESUtil;

/**
* @author qu
*/
public class Main {
private static SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
public static void main(String[] args) throws Exception {
//一下是创建新的Excel 参数
File directory = new File("1234解密.xls");
directory.getCanonicalPath(); //得到的是C:/test/abc
String path = directory.getAbsolutePath();    //得到的是执行程序所在的文件路径

//File filewrite=new File("E:\\解密1234.xls");
File filewrite=new File(path);
    filewrite.createNewFile();
    OutputStream os=new FileOutputStream(filewrite);
    //创建工作薄
    WritableWorkbook workbook = jxl.Workbook.createWorkbook(os);
    //创建新的一页
    WritableSheet newSheet = workbook.createSheet("First Sheet",0);
    
    //一下是处理被机密的文件
    Workbook wb =null;
    Sheet sheet = null;
    Row row = null;
    List<Map<String,String>> list = null;
    String cellData = null;
File directory2 = new File("1234.xlsx");
directory2.getCanonicalPath(); //得到的是C:/test/abc
String path2 = directory2.getAbsolutePath();    //得到的是C:/test/abc

//String filePath = "E:\\1234.xlsx";
wb = readExcel(path2);
if(wb != null){
        //用来存放表中数据
        list = new ArrayList<Map<String,String>>();
        //获取第一个sheet
        sheet = wb.getSheetAt(0);
        //获取最大行数
        int rownum = sheet.getPhysicalNumberOfRows();
        //获取第一行
        row = sheet.getRow(0);
        //获取最大列数
        int colnum = row.getPhysicalNumberOfCells();
        //打印行数和列数
        //System.out.println("rownum="+rownum+",colnum="+colnum);
       
        for (int i = 0; i<rownum; i++) {//遍历行数
            row = sheet.getRow(i);
            if(row !=null){
                for (int j=0;j<colnum;j++){//遍历列
                    cellData =  (String)getCellFormatValue(row.getCell(j));
                    //------------
                    //前面参数是列，后面参数是行
                    String sss = CryptDESUtil.decodeDES(cellData);
                    Label newLabel = new Label(j,i,sss);//执行解密
                    newSheet.addCell(newLabel);
                    //------------
                }
            }else{
                break;
            }
        }
        workbook.write();
        workbook.close();
        os.close();
}
    System.out.println("--------Success--------");
}
//读取excel
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();
    }
    return wb;
}
public static Object getCellFormatValue(Cell cell){
    Object cellValue = null;
    if(cell!=null){
        //判断cell类型
        switch(cell.getCellType()){
        case Cell.CELL_TYPE_NUMERIC:{
            //判断cell是否为日期格式
            if(DateUtil.isCellDateFormatted(cell)){
                //转换为日期格式YYYY-mm-dd
                cellValue = sdf.format(cell.getDateCellValue());
            }else{
                //数字
                cellValue = String.valueOf(cell.getNumericCellValue());
            }
            break;
        }
        case Cell.CELL_TYPE_FORMULA:{
            //判断cell是否为日期格式
            if(DateUtil.isCellDateFormatted(cell)){
                //转换为日期格式YYYY-mm-dd
                cellValue = sdf.format(cell.getDateCellValue());
            }else{
                //数字
                cellValue = String.valueOf(cell.getNumericCellValue());
            }
            break;
        }
        case Cell.CELL_TYPE_STRING:{
            cellValue = cell.getRichStringCellValue().getString();
            break;
        }
        default:
            cellValue = "";
        }
    }else{
        cellValue = "";
    }
    return cellValue;
}
}