Excel--java POi

import java.io.File; import java.io.FileOutputStream; import org.apache.commons.io.FileUtils; 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; public class PoiExpExcel { public static void main(String[] args) { String[] title={"ID","用户","密码"}; //建立Excel工做薄
        HSSFWorkbook workbook=new HSSFWorkbook(); //建立一个工做表sheet
        HSSFSheet sheet=workbook.createSheet(); //建立第一行
        HSSFRow row= sheet.createRow(0); HSSFCell cell=null; //插入第一行数据
        for (int i = 0; i < title.length; i++) { cell=row.createCell(i); cell.setCellValue(title[i]); } //追加数据
        for (int i = 0; i < 10; i++) { HSSFRow nextrow=sheet.createRow(i); //第一个单元格
            HSSFCell cell2=nextrow.createCell(0); cell2.setCellValue("a"+i); //第二个单元格
            cell2=nextrow.createCell(1); cell2.setCellValue("小明"+i); //第三个单元格
            cell2=nextrow.createCell(2); cell2.setCellValue("123456"); } //建立一个文件
        File file=new File("e:/poi_test.xls"); try { file.createNewFile(); //写入硬盘
            FileOutputStream stream=FileUtils.openOutputStream(file); workbook.write(stream); stream.close(); } catch (Exception e) { // TODO Auto-generated catch block
 e.printStackTrace(); } } }

这里是导出的代码 直接贴上，下面的是导入

import java.io.File; import java.io.IOException; import org.apache.commons.io.FileUtils; 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; public class PoiReaderExcel { public static void main(String[] args) { File file=new File("e:/poi_test.xls"); try { //建立Excel,读取文件
            HSSFWorkbook workbook=new HSSFWorkbook(FileUtils.openInputStream(file)); //获取第一张工做表 ：经过名字获取 // HSSFSheet sheet=workbook.getSheet("sheet0"); //读取默认的第一张工做页
            HSSFSheet sheet=workbook.getSheetAt(0); //读取分步骤详细
            int FirstRowNum=sheet.getFirstRowNum(); int LastRowNum=sheet.getLastRowNum(); for (int i = FirstRowNum; i < LastRowNum; i++) { HSSFRow row=sheet.getRow(i); int FirstCellNum=row.getFirstCellNum(); int LastCellNum=row.getLastCellNum(); for (int j = FirstCellNum; j < LastCellNum; j++) { HSSFCell cell=row.getCell(j); System.out.print(cell.getStringCellValue()+"  "); } System.out.println(); } // for (int i = 0; i < sheet.getLastRowNum(); i++) { // for (int j = 0; j < sheet.getRow(i).getLastCellNum(); j++) { // System.out.print(sheet.getRow(i).getCell(j).getStringCellValue()+" "); // } // System.out.println(); // }
 } catch (IOException e) { // TODO Auto-generated catch block
 e.printStackTrace(); } } }