POI操作Excel详解，HSSF和XSSF两种方式

HSSF方式：

package com.tools.poi.lesson1;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;

import com.tools.poi.bean.Student;

public class ExcelUtilWithHSSF {
    public static void main(String[] args) {
        try {
            getExcelAsFile("aaa");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        
//        try {
//            CreateExcelDemo1();
//        } catch (ParseException e) {
//            e.printStackTrace();
//        }
        
        
    }
    
    /**
     * 得到Excel，并解析内容
     * @param file
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static void getExcelAsFile(String file) throws FileNotFoundException, IOException{
        //1.得到Excel常用对象
//        POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("d:/FTP/test.xls"));
        POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("d:/FTP/new1.xls"));
        //2.得到Excel工作簿对象
        HSSFWorkbook wb = new HSSFWorkbook(fs);
        //3.得到Excel工作表对象
        HSSFSheet sheet = wb.getSheetAt(0);
        //总行数
        int trLength = sheet.getLastRowNum();
        //4.得到Excel工作表的行
        HSSFRow row = sheet.getRow(0);
        //总列数
        int tdLength = row.getLastCellNum();
        //5.得到Excel工作表指定行的单元格
        HSSFCell cell = row.getCell((short)1);
        //6.得到单元格样式
        CellStyle cellStyle = cell.getCellStyle();
        for(int i=0;i

XSSF方式：

package com.tools.poi.lesson1;

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.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
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.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.WorkbookUtil;

import com.tools.poi.bean.Student;

public class ExcelUtilWithXSSF {
    public static void main(String[] args) {
        try {
            getExcelAsFile("d:/FTP/系统报表.xls");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InvalidFormatException e) {
            e.printStackTrace();
        }
        
        
//        try {
//            CreateExcelDemo1();
//        } catch (ParseException e) {
//            e.printStackTrace();
//        }
        
        
    }
    
    /**
     * 得到Excel，并解析内容  对2007及以上版本 使用XSSF解析
     * @param file
     * @throws FileNotFoundException
     * @throws IOException
     * @throws InvalidFormatException 
     */
    public static void getExcelAsFile(String file) throws FileNotFoundException, IOException, InvalidFormatException{
//        //1.得到Excel常用对象
//        POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("d:/FTP/new1.xls"));
//        //2.得到Excel工作簿对象
//        HSSFWorkbook wb = new HSSFWorkbook(fs);

        
        
        InputStream ins = null;   
        Workbook wb = null;   
            ins=new FileInputStream(new File(file));   
            //ins= ExcelService.class.getClassLoader().getResourceAsStream(filePath);   
            wb = WorkbookFactory.create(ins);   
            ins.close();   
        
        
        //3.得到Excel工作表对象
        Sheet sheet = wb.getSheetAt(0);
        //总行数
        int trLength = sheet.getLastRowNum();
        //4.得到Excel工作表的行
        Row row = sheet.getRow(0);
        //总列数
        int tdLength = row.getLastCellNum();
        //5.得到Excel工作表指定行的单元格
        Cell cell = row.getCell((short)1);
        //6.得到单元格样式
        CellStyle cellStyle = cell.getCellStyle();

        for(int i=5;i