package jexcel;  import java.io.*;
import jxl.*;
import jxl.write.*;   /** * @author Ken * * To change the template for this generated type comment go to * Window>Preferences>Java>Code Generation>Code and Comments */
public class CreateXLS {  public static void main(String[] args) {  try {  //open file.  WritableWorkbook book = Workbook.createWorkbook(new File("d:/Test.xls"));  //create Sheet named "Sheet_1". 0 means this is 1st page.  WritableSheet sheet = book.createSheet("Sheet_1", 0);  //define cell column and row in Label Constructor, and cell content write "test".  //cell is 1st-Column,1st-Row. value is "test".  Label label = new Label(0, 0, "test");  //add defined cell above to sheet instance.
            sheet.addCell(label);  //create cell using add numeric. WARN:necessarily use integrated package-path, otherwise will be throws path-error.  //cell is 2nd-Column, 1st-Row. value is 789.123.  jxl.write.Number number = new jxl.write.Number(1, 0, 789.123);  //add defined cell above to sheet instance.
            sheet.addCell(number);  //add defined all cell above to case.
            book.write();  //close file case.
            book.close();  } catch (Exception e) {  e.printStackTrace();  }  }
}  

package jexcel;
import java.io.*;
import jxl.*;  /** * @author Ken * * To change the template for this generated type comment go to * Window>Preferences>Java>Code Generation>Code and Comments */
public class ReadXLS {  public static void main(String[] args) {  try {  Workbook book = Workbook.getWorkbook(new File("e:/pos/rule.xls"));  //get a Sheet object.   Sheet sheet = book.getSheet(0);  //get 1st-Column,1st-Row content.  // Cell cell = sheet.getCell(1, 2); //先是列序号，然后是行序号，都是从0开始算起Cell[] cell=sheet.getColumn(0);for(int i=0;i<cell.length;i++){String result = cell[i].getContents();  System.out.println(result);  }book.close();  } catch (Exception e) {  e.printStackTrace();  }  }
}  

package jexcel;import java.io.*;
import jxl.*;
import jxl.write.*;  /** * @author Ken * * To change the template for this generated type comment go to * Window>Preferences>Java>Code Generation>Code and Comments */
public class UpdateXLS {  public static void main(String[] args) {  try {  //get file.  Workbook wb = Workbook.getWorkbook(new File("d:/Test.xls"));  //open a copy file(new file), then write content with same content with Test.xls.    WritableWorkbook book =  Workbook.createWorkbook(new File("d:/Test.xls"), wb);  //add a Sheet.  WritableSheet sheet = book.createSheet("Sheet_2", 1);  sheet.addCell(new Label(0, 0, "test2"));  book.write();  book.close();  } catch (Exception e) {  e.printStackTrace();  }  }
}  

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import java.util.logging.Logger;import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;public class xlsx {public static void main(String[] args) {// TODO Auto-generated method stubpoiExcel("e:/pos/rules.xlsx");}private static void poiExcel(String saveName){  try{  String realPath =saveName;  File fileDes = new File(realPath);  InputStream str = new FileInputStream(fileDes);  XSSFWorkbook xwb = new XSSFWorkbook(str);  //利用poi读取excel文件流  XSSFSheet st = xwb.getSheetAt(0);  //读取sheet的第一个工作表  int rows=st.getLastRowNum();//总行数  int cols;//总列数  //log.info("========行========"+rows);  for(int i=0;i<rows;i++){  XSSFRow row=st.getRow(i);//读取某一行数据  if(row!=null){  //获取行中所有列数据  cols=row.getLastCellNum();  //log.info("========行========"+rows+"=====列========"+cols);  for(int j=0;j<cols;j++){  XSSFCell cell=row.getCell(j);  if(cell==null){  System.out.print("   ");    }else{  //判断单元格的数据类型  switch (cell.getCellType()) {    case XSSFCell.CELL_TYPE_NUMERIC: // 数字    System.out.print(cell.getNumericCellValue() + "   ");    break;    case XSSFCell.CELL_TYPE_STRING: // 字符串    System.out.print(cell.getStringCellValue() + "   ");    break;    case XSSFCell.CELL_TYPE_BOOLEAN: // Boolean    System.out.println(cell.getBooleanCellValue() + "   ");    break;    case XSSFCell.CELL_TYPE_FORMULA: // 公式    System.out.print(cell.getCellFormula() + "   ");    break;    case XSSFCell.CELL_TYPE_BLANK: // 空值    System.out.println("");    break;    case XSSFCell.CELL_TYPE_ERROR: // 故障    System.out.println("故障");    break;    default:    System.out.print("未知类型   ");    break;    }    }  }  }  }  }catch(IOException e){  e.printStackTrace();     }  }  }