jsp如下：
點擊(此處)摺疊或打開
- <a href="ReportServlet" onclick="return confirm('確認數據導出到E:/下?');">導出數據到Excel</a>
點擊(此處)摺疊或打開
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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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//獲得要生成Excel數據的數據庫中的表名稱
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String tableName = request.getParameter("tableName");
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// 禁止數據緩存。
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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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// 獲取總列數
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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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// 創建Excel文檔
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HSSFWorkbook wb = new HSSFWorkbook() ;
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// sheet 對應一個工作頁
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HSSFSheet sheet = wb.createSheet("test_table表中的數據") ;
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HSSFRow firstrow = sheet.createRow(0); //下標爲0的行開始
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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] = "學號";
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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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// 創建電子表格的一行
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HSSFRow row = sheet.createRow(i) ; // 下標爲1的行開始
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for(int j=0;j<CountColumnNum;j++)
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{
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// 在一行內循環
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HSSFCell cell = row.createCell( j) ;
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// 設置表格的編碼集，使支持中文
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//
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// 先判斷數據庫中的數據類型
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// 將結果集裏的值放入電子表格中
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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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// 創建文件輸出流，準備輸出電子表格
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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("數據庫導出成功") ;
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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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