简单的java读写excel

首先是读Excel：

package August;

import java.io.File;

import jxl.Cell;
import jxl.CellType;
import jxl.DateCell;
import jxl.NumberCell;
import jxl.Sheet;
import jxl.Workbook;

public class ReadExcel {
	public static void main(String[] args) {
		Workbook workbook = null;

		try {
		   workbook = Workbook.getWorkbook(new File("d:\\readExcel.xls"));
		} catch (Exception e) {
		  e.printStackTrace();
		}

		Sheet sheet = workbook.getSheet(0);
		Cell cell = null;

		int columnCount=4;//代表列
		int rowCount=sheet.getRows();//得到列有多少行
		for (int i = 0; i <rowCount; i++) {
		   for (int j = 0; j <columnCount; j++) {
		       //注意，这里的两个参数，第一个是表示列的，第二才表示行
		       cell=sheet.getCell(j, i);
		       //要根据单元格的类型分别做处理，否则格式化过的内容可能会不正确
		       if(cell.getType()==CellType.NUMBER){
		           System.out.print(((NumberCell)cell).getValue());
		       }
		       else if(cell.getType()==CellType.DATE){
		           System.out.print(((DateCell)cell).getDate());
		       }
		       else{
		           System.out.print(cell.getContents());
		       }
		       
		       //System.out.print(cell.getContents());
		       System.out.print("\t");
		   }
		   System.out.print("\n");
		}
		//关闭它，否则会有内存泄露
		workbook.close();

	}
}

然后是写Excel：

package August;

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

import jxl.Workbook;
import jxl.format.UnderlineStyle;
import jxl.write.DateFormat;
import jxl.write.DateTime;
import jxl.write.Label;
import jxl.write.NumberFormat;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

public class WriteExcel {
	public static void main(String[] args) {
		File tempFile=new File("d:/writeExcel.xls");
		WritableWorkbook workbook = null;
		try {
			workbook = Workbook.createWorkbook(tempFile);
		} catch (IOException e) {
			e.printStackTrace();
		}
		WritableSheet sheet = workbook.createSheet("TestCreateExcel", 0); 

		//一些临时变量，用于写到excel中
		Label l=null;
		jxl.write.Number n=null;
		DateTime d=null;

		//预定义的一些字体和格式，同一个Excel中最好不要有太多格式
		WritableFont headerFont = new WritableFont(WritableFont.ARIAL, 12, WritableFont.BOLD, false,UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLUE); 
		WritableCellFormat headerFormat = new WritableCellFormat (headerFont); 

		WritableFont titleFont = new WritableFont(WritableFont.ARIAL, 10, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.RED); 
		WritableCellFormat titleFormat = new WritableCellFormat (titleFont); 

		WritableFont detFont = new WritableFont(WritableFont.ARIAL, 10, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLACK); 
		WritableCellFormat detFormat = new WritableCellFormat (detFont); 

		NumberFormat nf=new NumberFormat("0.00000");  //用于Number的格式
		WritableCellFormat priceFormat = new WritableCellFormat (detFont, nf); 

		DateFormat df=new DateFormat("yyyy-MM-dd");//用于日期的
		WritableCellFormat dateFormat = new WritableCellFormat (detFont, df); 

		//剩下的事情，就是用上面的内容和格式创建一些单元格，再加到sheet中
		l=new Label(1, 0, "用于测试的Excel文件", headerFormat);
		try{
			
		sheet.addCell(l);

		//add Title
		int column=0;
		l=new Label(column++, 2, "标题", titleFormat);
		sheet.addCell(l);
		l=new Label(column++, 2, "日期", titleFormat);
		sheet.addCell(l);
		l=new Label(column++, 2, "货币", titleFormat);
		sheet.addCell(l);
		l=new Label(column++, 2, "价格", titleFormat);
		sheet.addCell(l);

		//add detail
		int i=0;
		column=0;
		l=new Label(column++, i+3, "标题 "+i, detFormat);
		sheet.addCell(l);
		d=new DateTime(column++, i+3, new java.util.Date(), dateFormat);
		sheet.addCell(d);
		l=new Label(column++, i+3, "CNY", detFormat);
		sheet.addCell(l);
		n=new jxl.write.Number(column++, i+3, 5.678, priceFormat);
		sheet.addCell(n);

		i++;
		column=0;
		l=new Label(column++, i+3, "标题 "+i, detFormat);
		sheet.addCell(l);
		d=new DateTime(column++, i+3, new java.util.Date(), dateFormat);
		sheet.addCell(d);
		l=new Label(column++, i+3, "SGD", detFormat);
		sheet.addCell(l);
		n=new jxl.write.Number(column++, i+3, 98832, priceFormat);
		sheet.addCell(n);

		//设置列的宽度
		column=0;
		sheet.setColumnView(column++, 20);
		sheet.setColumnView(column++, 20);
		sheet.setColumnView(column++, 10);
		sheet.setColumnView(column++, 20);

		workbook.write();
		workbook.close();
		}catch(Exception e) {
			
		}

	}
}

以上代码必须导入jxl.jar包。