问题描述
如题，代码如下：package test;import java.io.File;import java.io.FileOutputStream;import java.io.OutputStream; import java.io.IOException; import java.io.OutputStream; import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.List; import javax.servlet.*; import jxl.Workbook;import jxl.write.Label;import jxl.write.WritableCellFormat;import jxl.write.WritableFont;import jxl.write.WritableSheet;import jxl.write.WritableWorkbook;public class TestExcel {private String driverClass = "net.sourceforge.jtds.jdbc.Driver"; private String url ="jdbc:jtds:sqlserver:/localhost:1433/demo"; private String user = "sa"; private String password = ""; private Connection connection;public void exportClassroom(OutputStream os) { try { WritableWorkbook wbook = Workbook.createWorkbook(os); //建立excel文件 WritableSheet wsheet = wbook.createSheet("报警记录表", 0); //工作表名称 //设置Excel字体 WritableFont wfont = new WritableFont(WritableFont.ARIAL, 16, WritableFont.BOLD, false, jxl.format.UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLACK); WritableCellFormat titleFormat = new WritableCellFormat(wfont); String[] title = { "报警记录编号", "报警时间", "报警设备", "报警设备编号","报警事件名称","报警编号"}; //设置Excel表头 for (int i = 0; i < title.length; i++) { Label excelTitle = new Label(i, 0, title[i], titleFormat); wsheet.addCell(excelTitle); } int c = 1; //用于循环时Excel的行号 Connection con=openConnection(); Statement st=con.createStatement(); String sql="select * from jlbjsj where BJJLSJ between '2010-09-01 08:19:25' and '2010-12-02 08:19:25' and BJSBMC like '%'";ResultSet rs=st.executeQuery(sql); //这个是从数据库中取得要导出的数据 while (rs.next()){Label content1 = new Label(0, c, (String)rs.getString("BJJLBH")); Label content2 = new Label(1, c, (String)rs.getString("BJJLSJ")); Label content3 = new Label(2, c, (String)rs.getString("BJSBMC")); Label content4 = new Label(3, c, (String)rs.getString("BJSBBH"));Label content5 = new Label(4, c, (String)rs.getString("BJBLMC"));Label content6 = new Label(5, c, (String)rs.getString("BJBLBH"));//Label content7 = new Label(3, c, (String)rs.getString("BJSBBH"));wsheet.addCell(content1); wsheet.addCell(content2); wsheet.addCell(content3); wsheet.addCell(content4);wsheet.addCell(content5);wsheet.addCell(content6);c++; } wbook.write(); //写入文件 wbook.close(); os.close(); System.out.println("导入成功！");} catch (Exception e) { e.printStackTrace(); } }public Connection openConnection() throws SQLException { try { Class.forName(driverClass).newInstance(); connection = DriverManager.getConnection(url, user, password); return connection; } catch (Exception e) { throw new SQLException(e.getMessage()); } } public void closeConnection() { try { if (connection != null) connection.close(); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args){ TestExcel te=new TestExcel(); File f=new File("c:\kk.xls"); try{ f.createNewFile(); OutputStream os=new FileOutputStream(f); te.exportClassroom(os); }catch(Exception e){ e.printStackTrace(); } }} 问题补充：梦中有你 写道
解决方案
文件下载例子：[url]http://yaofeng911.iteye.com/blog/472492[/url]把相应的流、文件替换成你的就OK了
解决方案二：
# File f=new File("c:\kk.xls"); # try{ # f.createNewFile(); # OutputStream os=new FileOutputStream(f); # te.exportClassroom(os); # }catch(Exception e){ # e.printStackTrace(); # } 你自己写的代码，你是用File来构建OutputStream的 你说它最后写入到哪里去了？c:/kk.xls啊 如果你的项目发布到了服务器上，那就在服务器的C盘 你想弄到本地的话你就别写入文件，用装载了数据的流传输给客户端，让客户保存，即可弄到本地（相当于文件下载）