import java.io.File;
import java.io.FileOutputStream;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 poi_write {public static void main(String[] args) {final String [] str = {"id", "name", "sex"};//创建Excel工作薄HSSFWorkbook workbook = new HSSFWorkbook();//创建Excel工作表HSSFSheet sheet = workbook.createSheet();//创建第一行HSSFRow row = sheet.createRow(0);HSSFCell cell = null;//添加表头for (int i = 0; i < str.length; i++) {cell = row.createCell(i);cell.setCellValue(str[i]);}//追加数据for (int i = 1; i <= 10; i++) {HSSFRow rows = sheet.createRow(i);HSSFCell cell_id = rows.createCell(0);cell_id.setCellValue(i+"");HSSFCell cell_name = rows.createCell(1);cell_name.setCellValue("name:"+i);HSSFCell cell_sex = rows.createCell(2);cell_sex.setCellValue("男");}//文件保存路径File file = new File("E:/cnblogs/poi_text.xls");try{if(!file.exists()){file.createNewFile();}FileOutputStream fileOut = new FileOutputStream(file);//创建一个文件输出流对象
            workbook.write(fileOut);fileOut.close();//关闭输出流对象}catch (Exception e) {e.printStackTrace();}System.out.println("Excel文件已生成");}}

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 poi_reading {public static void main(String[] args) {final File file = new File("E:/cnblogs/poi_text.xls");if(file.exists()){try {HSSFWorkbook workbook = new HSSFWorkbook(FileUtils.openInputStream(file));//workbook.getSheet("Sheet0");获得指定的工作表//HSSFSheet sheet = workbook.getSheet("Sheet0");//workbook.getSheetAt(0);默认获得第一个工作表HSSFSheet sheet = workbook.getSheetAt(0);int firstRowNum = 0;//获得当前sheet最后一行行号int lastRowNum = sheet.getLastRowNum();for (int i = firstRowNum; i <= lastRowNum; i++) {HSSFRow row = sheet.getRow(i);//获得当前行最后单元格列号int lastCellNum = row.getLastCellNum();for (int j = 0; j < lastCellNum; j++) {HSSFCell cell = row.getCell(j);String value = cell.getStringCellValue();System.out.print(value+" ");}System.out.println("");}} catch (IOException e) {e.printStackTrace();}}else{System.out.println("读取文件不存在");}}}