Poi低版本生成excel和解析

package com.jmz.java;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

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 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String title[] = {"id","name","sex"};
        //生成表
        HSSFWorkbook workbook = new HSSFWorkbook();
        //sheet页
        HSSFSheet sheet = workbook.createSheet();
        //创建第1行
        HSSFRow row1 = sheet.createRow(0);
        //循环加入cell
        HSSFCell cell = null;
        //添加第一行内容
        for (int i = 0; i < title.length; i++) {
            cell = row1.createCell(i);
            cell.setCellValue(title[i]);
        }
        //追加数据
        for (int i = 1; i < 11; i++) {
            //循环创建行，从第2行开始
            HSSFRow row2 = sheet.createRow(i);
            //创建第一个单元
            HSSFCell cell1 = row2.createCell(0);
            //设置值
            cell1.setCellValue(i+"");
            //第二个
            cell1 = row2.createCell(1);
            cell1.setCellValue("jim"+i);
            //第三个
            cell1 = row2.createCell(2);
            cell1.setCellValue("男");
        }
        //创建文件
         File file = new File("d:\poi.xls");
         try {
             //创建文件
            file.createNewFile();
            FileOutputStream fos = new FileOutputStream(file);
            //把内容写入文件
            workbook.write(fos);
            //关流
            fos.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

解析：

package com.jmz.java;

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 PreaseExcel {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            //获取workbook
            HSSFWorkbook workbook = new HSSFWorkbook(FileUtils.openInputStream(new File("d:\poi.xls")));
            //创建sheet页
            HSSFSheet sheet = workbook.getSheetAt(0);
            int firstRow = 0;
        //获取最后一行行数
            int lastRow = sheet.getLastRowNum();
            for (int i = firstRow; i < lastRow; i++) {
                //获取当前行数
                HSSFRow row = sheet.getRow(i);
                //获取当前行数的最后一个cell数
                int lastCellNum = row.getLastCellNum();
                //遍历此行的cell数
                for (int j = 0; j < lastCellNum; j++) {
                    //获取这个cell
                    HSSFCell cell = row.getCell(j);
                    String value = cell.getStringCellValue();
                    System.out.print(value+"  ");
                }
                System.out.println();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}