工作上常需要將資料庫的資料組合後產生Excel，利用Apache POI所提供的Library，這項工作可以輕鬆達成，這個Example比較重要的物件為HSSFWorkbook(產生workbook物件)、HSSFSheet(產生Sheet物件)、HSSFROW以及HSSFCell(產生儲存格物件)比較重要的物件，一開始必須產生HSSFWorkbook物件，接著產生HSSFSheet物件及HSSFRow物件或是HSSFCell物件，有了workbook物件就可以createSheet，有了sheet物件後就可以createRow，有了row物件後就可以createCell，有了Cell物件後呼叫setCellValue()指定值，透過迴圈，就可以把資料庫相關欄位讀入workbook中sheet下的某一cell中，最後在寫到檔案中，即完成了

import java.io.File;
import java.io.FileOutputStream;
import java.sql.ResultSet;
import java.sql.SQLException;

import dao.GetDBInfo;

import org.apache.poi.hssf.usermodel.*;

public class ExportExcel {
	public void createFDDRToFDI() throws SQLException{
		String sqlFFF="SELECT fddr_log.`No`,fddr_log.Rev, fddr_log.`Status`, fddr_log.CommitDate, fddr_log.ReviewDate, fddr_log.IssuedDate, fdi_log.`No`,fdi_log.Rev,fdi_log.`Status`, fdi_log.CommitDate,fdi_log.CompletedDate "+
				"FROM fddr_log INNER JOIN ge_refdoc ON fddr_log.CID = ge_refdoc.CidNo LEFT OUTER JOIN fdi_log ON ge_refdoc.RefCidNo = fdi_log.CID WHERE fddr_log.`No` not like '%LT2%' and fddr_log.rev >=100 "+
				"ORDER BY fddr_log.`No` DESC, fddr_log.Rev DESC, fdi_log.`No` DESC, fdi_log.Rev DESC";
		GetDBInfo dao=new GetDBInfo();
		ResultSet set=dao.getResultSet(sqlFFF);
		int colCount= dao.getSetMetaData(set).getColumnCount();
		HSSFWorkbook workbook= new HSSFWorkbook();
		HSSFSheet sheet= workbook.createSheet("FDDRToFDI");
		int rowNum=0;
		HSSFRow header= sheet.createRow(rowNum);
		for(int i=0; i<colCount; i++){
			HSSFCell cell= header.createCell(i);
			cell.setCellValue((String)dao.getSetMetaData(set).getColumnLabel(i+1));
		}
		while(set.next()){
			rowNum++;
			HSSFRow row= sheet.createRow(rowNum);
			for (int i=0;i<colCount;i++){
				HSSFCell cell=row.createCell(i);
				cell.setCellValue(set.getString(i+1));
			}
			
			}
		try{
			FileOutputStream out = new FileOutputStream("C:\\Documents and Settings\\joombuopre\\桌面\\1.xls");
			workbook.write(out);
			out.flush();
			out.close();
			System.out.println("Success");
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	
}