POI--HSSFWorkbook类

• HSSFWorkbook类

• 1，创建excel表

HSSFWorkbook workbook = new HSSFWorkbook()。

保存操作用「HSSFWorkbook」类的「write」方法:参数是作为保存对象的输出流对象「OutputStream」。

package linkin;

import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class Linkin
{
	public static void main(String[] args)
	{
		HSSFWorkbook workbook = new HSSFWorkbook();//创建一个空白的workbook

		FileOutputStream out = null;
		try
		{
			out = new FileOutputStream("sample.xls");
			//fileOut= new FileOutputStream("c:\\workbook.xls");
			//fileOut= new FileOutputStream("c:/workbook.xls");
			workbook.write(out);//调用HSSFWorkbook类的write方法写入到输出流
			System.out.println("OK");
		}
		catch (IOException e)
		{
			System.out.println(e.toString());
		}
		finally
		{
			try
			{
				out.close();
			}
			catch (IOException e)
			{
				System.out.println(e.toString());
			}
		}

	}

}

• 2，POIFSFileSystem类定义

「POIFSFileSystem」类对象可以把Excel文件作为数据流来进行传入传出。这里介绍下POIFSFileSystem类，这个类是专门用来读取excel表格的。他有如下2个构造器：

以下代码演示如何通过POIFSFileSystem读取Excel文件：

package linkin;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

public class Linkin
{
	public static void main(String[] args)
	{
		FileInputStream in = null;
		HSSFWorkbook workbook = null;

		try
		{
			in = new FileInputStream("sample1.xls");//将excel文件转为输入流
			POIFSFileSystem fs = new POIFSFileSystem(in);//构建POIFSFileSystem类对象，用输入流构建
			workbook = new HSSFWorkbook(fs);//创建个workbook，根据POIFSFileSystem对象
			System.out.println("OK");
		}
		catch (IOException e)
		{
			System.out.println(e.toString());
		}
		finally
		{
			try
			{
				in.close();
			}
			catch (IOException e)
			{
				System.out.println(e.toString());
			}
		}

		FileOutputStream out = null;
		try
		{
			out = new FileOutputStream("sample2.xls");
			workbook.write(out);
			System.out.println("OK");
		}
		catch (IOException e)
		{
			System.out.println(e.toString());
		}
		finally
		{
			try
			{
				out.close();
			}
			catch (IOException e)
			{
				System.out.println(e.toString());
			}
		}

	}

}