数据库导出为Excel

创建数据库和表：

create database test; crate table test( id int primary key, name varchar(10), sex varchar(10), age int, address varchar(20) );
插入测试数据：

insert into test values(1,'zhangsan1','男',20,'北京'); insert into test values(2,'zhangsan2','女',22,'北京'); insert into test values(3,'zhangsan3','女',20,'北京'); insert into test values(4,'zhangsan4','男',18,'北京'); insert into test values(5,'zhangsan5','男',20,'北京');
Servlet： JavaToExcel.java

import java.io.IOException; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Hashtable; import java.util.List; import java.util.Vector; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import jxl.Workbook; import jxl.format.Alignment; import jxl.format.VerticalAlignment; import jxl.write.Label; import jxl.write.WritableCellFormat; import jxl.write.WritableFont; import jxl.write.WritableSheet; import jxl.write.WritableWorkbook; import jxl.write.WriteException; public class JavaToExcel extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //数据库操作 try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } Connection con = null; PreparedStatement pst = null; ResultSet rs = null; int rows = 1; try { con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","123"); pst = con.prepareStatement("select * from test"); rs = pst.executeQuery(); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } //标题 String fileName = "my first execl"; // 获得 OutputStream 最后把生成的excel通过这个写出 OutputStream os = response.getOutputStream(); response.setContentType("application/ms-excel;charset=gbk"); request.setCharacterEncoding("gbk"); response.setContentType("text/html;charset=gbk"); // 设置头 response.setHeader("Content-Disposition", "attachment;filename="+ fileName + ".xls"); // 标题字体 WritableFont(FontName fn,int ps,BoldStyle bs,Boolean italic) 字体类型 字体大小 字体样式 是否斜体 WritableFont wfc = new WritableFont(WritableFont.ARIAL, 15, WritableFont.BOLD, true); WritableCellFormat wcfFC = new WritableCellFormat(wfc); // 标题 居中对齐 try { //左右居中 wcfFC.setAlignment(Alignment.CENTRE); //上下居中 wcfFC.setVerticalAlignment(VerticalAlignment.CENTRE); } catch (WriteException e) { e.printStackTrace(); } try { // 字段字体 WritableFont wfc1 = new WritableFont(WritableFont.COURIER, 10, WritableFont.BOLD, true); WritableCellFormat wcfFC1 = new WritableCellFormat(wfc1); wcfFC1.setAlignment(Alignment.CENTRE); //左右居中 wcfFC1.setVerticalAlignment(VerticalAlignment.CENTRE); //上下居中 // 通过OutputStream对象os创建Workbook WritableWorkbook wbook = Workbook.createWorkbook(os); // 创建sheet WritableSheet wsheet = wbook.createSheet("sheet", 0); // 加入标题 wsheet.mergeCells(0, 0, 6, 0); //第一行合并7个单元格 wsheet.addCell(new Label(0, 0, "人员信息表", wcfFC));// 写标题 看出坐标是基于 0，0 try{ while(rs.next()){ wsheet.addCell(new Label(0,rows,rs.getString(1),wcfFC1)); //列，行 wsheet.addCell(new Label(1,rows,rs.getString(2),wcfFC1)); wsheet.addCell(new Label(2,rows,rs.getString(3),wcfFC1)); wsheet.addCell(new Label(3,rows,rs.getString(4),wcfFC1)); wsheet.addCell(new Label(4,rows,rs.getString(5),wcfFC1)); rows++; } }catch(Exception e){ } // 加入打印时间 Date aaa = new Date(); SimpleDateFormat aSimpleDateFormat = new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); String today = aSimpleDateFormat.format(aaa); wsheet.addCell(new Label(5, rows+1, "打印日期:")); wsheet.addCell(new Label(6, rows+1, today)); // 写入流中 wbook.write(); wbook.close(); os.close(); } catch (WriteException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }
前台jsp页面 只需一个超链接<a>测试

<a href="javaToExcel">导出Excel</a> <!-- javaToExcel 为我的servlet URL映射路径 在web.xml里面配置有 --> 注：所需jar包 jxl.jar mysql.jar驱动

如果报java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/test 错误

可能原因有 mysql驱动必须放在 lib目录下。而不能右键项目 Build Path-->Add External...