java将查询到的数据导入Excel中

我现在从订单表中将数据查出来,然后导入桌面上名为order.xsl的文件中已经做完了,问题是每次导数据都会新建一个order.xsl的文件,依次类推(第一次导数据生成order.xsl,再导生成一个order(1).xsl,第三次生成order(2).xsl),能不能这样,每次导数据时判断文件是否存在,如果不存在则新建excel文件并写入数据,如果存在就在这个存在的文件下继续写数据(接着原来的数据下面写,这里要如何获取该Excel文件最后一行数据的行标),具体该如何做呢?哪位大神请指教下,有两个难点,一是判断Excel文件是否存在,如果存在,则在该文件下继续写数据,二是如何获取最后一行数据的行标,用来在下面继续写数据。

2个回答

 import jxl.*;   
import jxl.write.*;   
import java.io.*;   
import java.io.File.*;   
import java.util.*;   

public class excel   
{   
public static void main(String[] args)    
{   

String targetfile = "c:/out.xls";//输出的excel文件名   
String worksheet = "List";//输出的excel文件工作表名   
String[] title = {"ID","NAME","DESCRIB"};//excel工作表的标题   

WritableWorkbook workbook;   
try 
{   
//创建可写入的Excel工作薄,运行生成的文件在tomcat/bin下   
//workbook = Workbook.createWorkbook(new File("output.xls"));    
System.out.println("begin");   

OutputStream os=new FileOutputStream(targetfile);    
workbook=Workbook.createWorkbook(os);    

WritableSheet sheet = workbook.createSheet(worksheet, 0); //添加第一个工作表   
//WritableSheet sheet1 = workbook.createSheet("MySheet1", 1); //可添加第二个工作   
/* 
jxl.write.Label label = new jxl.write.Label(0, 2, "A label record"); //put a label in cell A3, Label(column,row) 
sheet.addCell(label);   
*/ 

jxl.write.Label label;   
for (int i=0; i<title.length; i++)   
{   
//Label(列号,行号 ,内容 )   
label = new jxl.write.Label(i, 0, title[i]); //put the title in row1    
sheet.addCell(label);    
}   

//下列添加的对字体等的设置均调试通过,可作参考用   

//添加数字   
jxl.write.Number number = new jxl.write.Number(3, 4, 3.14159); //put the number 3.14159 in cell D5   
sheet.addCell(number);   

//添加带有字型Formatting的对象    
jxl.write.WritableFont wf = new jxl.write.WritableFont(WritableFont.TIMES,10,WritableFont.BOLD,true);    
jxl.write.WritableCellFormat wcfF = new jxl.write.WritableCellFormat(wf);    
jxl.write.Label labelCF = new jxl.write.Label(4,4,"文本",wcfF);    
sheet.addCell(labelCF);    

//添加带有字体颜色,带背景颜色 Formatting的对象    
jxl.write.WritableFont wfc = new jxl.write.WritableFont(WritableFont.ARIAL,10,WritableFont.BOLD,false,jxl.format.UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.RED);    
jxl.write.WritableCellFormat wcfFC = new jxl.write.WritableCellFormat(wfc);    
wcfFC.setBackground(jxl.format.Colour.BLUE);   
jxl.write.Label labelCFC = new jxl.write.Label(1,5,"带颜色",wcfFC);    
sheet.addCell(labelCFC);    

//添加带有formatting的Number对象    
jxl.write.NumberFormat nf = new jxl.write.NumberFormat("#.##");    
jxl.write.WritableCellFormat wcfN = new jxl.write.WritableCellFormat(nf);    
jxl.write.Number labelNF = new jxl.write.Number(1,1,3.1415926,wcfN);    
sheet.addCell(labelNF);    

//3.添加Boolean对象    
jxl.write.Boolean labelB = new jxl.write.Boolean(0,2,false);    
sheet.addCell(labelB);    

//4.添加DateTime对象    
jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date());    
sheet.addCell(labelDT);    

//添加带有formatting的DateFormat对象    
jxl.write.DateFormat df = new jxl.write.DateFormat("ddMMyyyyhh:mm:ss");    
jxl.write.WritableCellFormat wcfDF = new jxl.write.WritableCellFormat(df);    
jxl.write.DateTime labelDTF = new jxl.write.DateTime(1,3,new java.util.Date(),wcfDF);    
sheet.addCell(labelDTF);    

//和宾单元格   
//sheet.mergeCells(int col1,int row1,int col2,int row2);//左上角到右下角   
sheet.mergeCells(4,5,8,10);//左上角到右下角   
wfc = new jxl.write.WritableFont(WritableFont.ARIAL,40,WritableFont.BOLD,false,jxl.format.UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.GREEN);    
jxl.write.WritableCellFormat wchB = new jxl.write.WritableCellFormat(wfc);    
wchB.setAlignment(jxl.format.Alignment.CENTRE);   
labelCFC = new jxl.write.Label(4,5,"单元合并",wchB);    
sheet.addCell(labelCFC); //   

//设置边框   
jxl.write.WritableCellFormat wcsB = new jxl.write.WritableCellFormat();    
wcsB.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.THICK);   
labelCFC = new jxl.write.Label(0,6,"边框设置",wcsB);    
sheet.addCell(labelCFC);    
workbook.write();    
workbook.close();   
}catch(Exception e)    
{    
e.printStackTrace();    
}    
System.out.println("end");   
Runtime r=Runtime.getRuntime();    
Process p=null;    
//String cmd[]={"notepad","exec.java"};    
String cmd[]={"C:\\Program Files\\Microsoft Office\\Office\\EXCEL.EXE","out.xls"};    
try{    
p=r.exec(cmd);    
}    
catch(Exception e){    
System.out.println("error executing: "+cmd[0]);    
}   

}   
}
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