JAVA将执行sql结果导入excel

Java实现将查询的sql结果集导入excel,用到jxl.jar包可在http://download.csdn.net/detail/qq8618/8304057 下载

public String queryResultToExcel(String sql,String filename,OutputStream os) {
		Connection conn = null;
		Statement sm = null;
		ResultSet rs = null;
		try {
			conn = getConnection();
			sm = conn.createStatement();
			rs = sm.executeQuery(sql);
			ResultSetMetaData rsmd = rs.getMetaData();
			WritableWorkbook wwb = Workbook.createWorkbook(os); // 建立excel文件
			WritableSheet sheet = wwb.createSheet(filename, 10); // 创建一个工作表
			// 设置单元格的文字格式
			WritableFont wf = new WritableFont(WritableFont.ARIAL, 10, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
			WritableCellFormat wcf = new WritableCellFormat(wf);
			wcf.setVerticalAlignment(VerticalAlignment.CENTRE);
			wcf.setAlignment(Alignment.LEFT);

			// 格式化数据--NUMBER类型
			NumberFormat numberFormat = new NumberFormat("###0.0#######");  
			WritableCellFormat cellFormatNumber = new WritableCellFormat(numberFormat); 
			cellFormatNumber.setVerticalAlignment(VerticalAlignment.CENTRE);
			cellFormatNumber.setAlignment(Alignment.RIGHT);
			
			NumberFormat numberFormat2 = new NumberFormat("###0");  
			WritableCellFormat cellFormatNumber2 = new WritableCellFormat(numberFormat2);  
			cellFormatNumber2.setVerticalAlignment(VerticalAlignment.CENTRE);
			cellFormatNumber2.setAlignment(Alignment.RIGHT);
			
			// 格式化数据--DATE类型
			DateFormat dateFormat=new DateFormat("yyyy-MM-dd");
			WritableCellFormat cellFormatDate = new WritableCellFormat(dateFormat);  
			cellFormatDate.setVerticalAlignment(VerticalAlignment.CENTRE);
			cellFormatDate.setAlignment(Alignment.CENTRE);
			// 格式化数据--文本
            WritableCellFormat  cellTextFormat = new WritableCellFormat(NumberFormats.TEXT);
            cellTextFormat.setAlignment(Alignment.CENTRE);
            cellTextFormat.setVerticalAlignment(VerticalAlignment.CENTRE);
            
			// 表体数据
			boolean flag = true;
			int r = 1;
			int c = 0;
			int columns = rsmd.getColumnCount();
			//缓存最大标题宽度
			Vector<Integer> colWidth = new Vector<Integer>();
			for(int i = 1; i <= columns; i++){
				colWidth.add(0);
			}
			
			while (rs.next()) {
				for (int i = 1; i <= columns; i++) {
					//添加表头数据
					if(flag){
						String key = rsmd.getColumnName(i).toLowerCase();
						sheet.setColumnView(c, key.getBytes("GBK").length + 4);
						sheet.addCell(new Label(c, 0, key,wcf));
						colWidth.set(i-1, key.getBytes("GBK").length); //缓存每列第一行数据的宽度
					}
				
					//设置列宽--如果下一列的数据比前一列宽，则保存最大宽度
					if(rs.getString(i) != null){
						if(colWidth.get(i-1)<rs.getString(i).length()){
							colWidth.set(i-1, rs.getString(i).length());
						}
						
						sheet.setColumnView(c, colWidth.get(i-1) + 4); //设置宽度
					}
					
					//判断数据类型
					
					if(rsmd.getColumnTypeName(i).equalsIgnoreCase("NUMBER")){
						if(rs.getString(i)!=null){
							if (rs.getString(i).indexOf(".")==-1) {
								sheet.addCell(new Number(c, r, rs.getDouble(i),cellFormatNumber2));
							}else{
								sheet.addCell(new Number(c, r, rs.getDouble(i),cellFormatNumber));
							}
						}else{
							sheet.addCell(new Number(c, r, 0,cellFormatNumber2));
						}
					}else if(rs.getString(i)!=null && rsmd.getColumnTypeName(i).equalsIgnoreCase("DATE")){
						sheet.addCell(new DateTime(c, r,rs.getDate(i),cellFormatDate));
					}else {
						sheet.addCell(new Label(c, r, rs.getString(i),cellTextFormat));
					}
					//列数
					c++;
				}
				flag = false;
				r++;
				c = 0;
			}
			wwb.write();
			wwb.close();
			return r+"_"+c;
		} catch (SQLException e) {
			e.printStackTrace();
			return e.getLocalizedMessage();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return e.getLocalizedMessage();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return e.getLocalizedMessage();
		} catch (WriteException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return e.getLocalizedMessage();
		} finally {
			try {
				rs.close();
				sm.close();
				conn.close();
			} catch (SQLException e) {
			}
		}
	}