jsp如下：
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- <a href="ReportServlet" onclick="return confirm('确认数据导出到E:/下?');">导出数据到Excel</a>
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package control;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.PrintWriter;
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import java.sql.Connection;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.poi.hssf.usermodel.HSSFCell;
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import org.apache.poi.hssf.usermodel.HSSFRichTextString;
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import org.apache.poi.hssf.usermodel.HSSFRow;
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import org.apache.poi.hssf.usermodel.HSSFSheet;
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import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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import db.DB;
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public class ReportServlet extends HttpServlet {
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/**
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*
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*/
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private static final long serialVersionUID = 1L;
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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this.doPost(request, response);
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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request.setCharacterEncoding("utf-8");
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//获得要生成Excel数据的数据库中的表名称
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String tableName = request.getParameter("tableName");
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// 禁止数据缓存。
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response.setHeader("Pragma", "no-cache");
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response.setHeader("Cache-Control", "no-cache");
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response.setDateHeader("Expires", 0);
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Connection conn = null ;
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DB db = new DB() ;
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conn = db.getDB() ;
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String sql = "select * from test_table" ;
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ResultSet rs = null;
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try {
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rs = conn.createStatement().executeQuery(sql);
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} catch (SQLException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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// 获取总列数
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int CountColumnNum=0;
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try {
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CountColumnNum = rs.getMetaData().getColumnCount();
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} catch (SQLException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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int i = 1 ;
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// 创建Excel文档
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HSSFWorkbook wb = new HSSFWorkbook() ;
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// sheet 对应一个工作页
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HSSFSheet sheet = wb.createSheet("test_table表中的数据") ;
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HSSFRow firstrow = sheet.createRow(0); //下标为0的行开始
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HSSFCell[] firstcell = new HSSFCell[CountColumnNum];
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String[] names = new String[CountColumnNum];
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names[0] = "ID";
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names[1] = "学号";
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names[2] = "姓名";
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for(int j= 0 ;j<CountColumnNum; j++){
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firstcell[j] = firstrow.createCell(j);
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firstcell[j].setCellValue(new HSSFRichTextString(names[j]));
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}
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try {
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while(rs.next())
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{
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// 创建电子表格的一行
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HSSFRow row = sheet.createRow(i) ; // 下标为1的行开始
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for(int j=0;j<CountColumnNum;j++)
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{
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// 在一行内循环
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HSSFCell cell = row.createCell( j) ;
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// 设置表格的编码集，使支持中文
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//
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// 先判断数据库中的数据类型
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// 将结果集里的值放入电子表格中
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try {
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cell.setCellValue(new HSSFRichTextString(rs.getString(j+1))) ;
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} catch (SQLException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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i++ ;
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}
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} catch (SQLException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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// 创建文件输出流，准备输出电子表格
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OutputStream out = new FileOutputStream("E:\\test.xls") ;
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wb.write(out) ;
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out.close() ;
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System.out.println("数据库导出成功") ;
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try {
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rs.close() ;
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} catch (SQLException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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try {
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conn.close() ;
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} catch (SQLException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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response.sendRedirect("test.jsp");
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}
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public static void main(String[] args)
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{
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try {
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@SuppressWarnings("unused")
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ReportServlet excel = new ReportServlet() ;
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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- }
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