采用jxl实现数据库结果集导出到excel文件

关键字：

jxl, excel, servlet

代码：

servlet：

import jxl.WorkbookSettings;
import jxl.Workbook;
import jxl.write.WritableWorkbook;
import jxl.write.WritableSheet;
import jxl.write.Label;
import jxl.write.WriteException;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.dao.DataAccessException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.ArrayUtils;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.ServletConfig;
import java.util.Locale;
import java.util.HashMap;
import java.util.Map;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.ResultSetMetaData;

/** */ /**
*
Title:ExcelGenerator servlet
*
Description: 采用jxl实现数据库结果集导出到excel文件。
*
Copyright: Copyright.com (c) 2003
*
Company:
* History:
* create
*
* @author youlq
* @version 1.0
*/
public class ExcelGenerator extends HttpServlet {
 //设定每个Sheet的行数
 private int pagesize=5000;
 private WorkbookSettings workbookSettings=new WorkbookSettings();
 //springframework 的 WebApplicationContext
 public static WebApplicationContext wac=null;
 //springframework 的 jdbc 操作模版类
 public static JdbcTemplate jdbcTemplate=null;
 protected final Log logger=LogFactory.getLog(getClass());

 /** *//**
 * 初始化
 *
 * @param config
 * @throws ServletException
 */
 public void init(ServletConfig config) throws ServletException{
 super.init(config);
 try{
 if(null!=getInitParameter("pagesize")){
 pagesize=Integer.parseInt(getInitParameter("pagesize"));
 }
 workbookSettings.setLocale(Locale.getDefault());
 wac=WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
 jdbcTemplate=(JdbcTemplate)wac.getBean("jdbcTemplate");
 } catch(Exception e){
 logger.error("ExcelGenerator init() error !"+e, e.getCause());
 e.printStackTrace();
 }
 }

 public String getServletInfo(){
 return "Servlet used to generate excel output";
 }

 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
 generateExcel(request, response);
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
 generateExcel(request, response);
 }

 /** *//**
 * in:
 * field1#Title&field2#Title&field3#Title
 * out:
 * {
 * field1:Title,
 * field2:Title
 * field3:Title
 * }
 *
 * @param columnTitle
 */
 public static HashMap generateColumnTitleMap(String columnTitle){
 HashMap map=new HashMap();
 String[] level1=StringUtils.split(columnTitle, "&");
 if(ArrayUtils.isEmpty(level1)) return null;
 for(int i=0;i<level1.length;i++){
 String[] level2=StringUtils.split(level1[i], "#");
 if(ArrayUtils.isEmpty(level2)||level2.length!=2) return null;
 map.put(level2[0].toLowerCase(), level2[1]);
 }
 return map;
 }

 public void generateExcel(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException{
 //todo 只允许本机调用。
 request.getRemoteHost();
 request.getServerName();
 response.setHeader("Content-Disposition", "attachment;");
 response.setContentType("application/x-msdownload");
 String sql=(String)request.getSession().getAttribute("ExcelGenerator_sql");
 String columnTitle=(String)request.getSession().getAttribute("ExcelGenerator_columntitle");
 Map columnTitleMap=null;

 if(StringUtils.isBlank(sql)) throw new ServletException("sql 字符串为空！");
 if(!StringUtils.isBlank(columnTitle)){
 columnTitleMap=generateColumnTitleMap(columnTitle);
 if(null==columnTitleMap){
 logger.error("generateColumnTitleMap error !columnTitle="+columnTitle);
 }
 }

 final WritableWorkbook writableWorkbook=Workbook.createWorkbook(response.getOutputStream(), workbookSettings);
 if(jdbcTemplate==null) throw new ServletException("ExcelGenerator 没有初始化成功！jdbcTemplate==null。");
 final Map columnTitleMap1=columnTitleMap;
 jdbcTemplate.query(sql, new ResultSetExtractor(){
 public Object extractData(ResultSet rs) throws SQLException, DataAccessException{
 try{
 int counter=0;
 int page=1;
 WritableSheet writableSheet=writableWorkbook.createSheet("第"+page+"页", 0);
 ResultSetMetaData rsmd=rs.getMetaData();
 int columnCount=rsmd.getColumnCount();
 String[] columnNames=new String[columnCount];
 for(int i=1;i<=columnCount;i++){
 columnNames[i-1]=rsmd.getColumnName(i).toLowerCase();
 if(columnTitleMap1==null){
 writableSheet.addCell(new Label(i-1, counter, columnNames[i-1]));
 } else{
 writableSheet.addCell(new Label(i-1, counter, (String)columnTitleMap1.get(columnNames[i-1])));
 }
 }
 counter=1;
 Object oValue=null;
 String value=null;
 while(rs.next()){
 //row
 for(int i=1;i<=columnCount;i++){
 oValue=JdbcUtils.getResultSetValue(rs, i);
 if(oValue==null){
 value="";
 } else{
 value=oValue.toString();
 }
 writableSheet.addCell(new Label(i-1, counter, value));
 }
 if(counter++>pagesize){
 counter=0;
 writableSheet=writableWorkbook.createSheet("第"+(++page)+"页", 0);
 }
 }
 } catch(WriteException e){
 e.printStackTrace();
 }
 return null;
 }
 }
 );
 writableWorkbook.write();
 try{
 writableWorkbook.close();
 } catch(WriteException e){
 logger.error("writableWorkbook.close() error !"+e, e.getCause());
 e.printStackTrace();
 }
 }
}

web.xml

< servlet >
 < servlet-name > ExcelGenerator SPAN style="COLOR: #800000">servlet-name >
 < servlet-class > com.fsti.xmnms.web.servlet.ExcelGenerator SPAN style="COLOR: #800000">servlet-class >
 < init-param >
 < param-name > pagesize SPAN style="COLOR: #800000">param-name >
 < param-value > 5000 SPAN style="COLOR: #800000">param-value >
 SPAN style="COLOR: #800000">init-param >
 < load-on-startup > 3 SPAN style="COLOR: #800000">load-on-startup >
 SPAN style="COLOR: #800000">servlet >
 < servlet-mapping >
 < servlet-name > ExcelGenerator SPAN style="COLOR: #800000">servlet-name >
 < url-pattern > *.xls SPAN style="COLOR: #800000">url-pattern >
 SPAN style="COLOR: #800000">servlet-mapping >

测试页面：

<%@ page contentType="text/html;charset=GB2312" language="java" %>]]> <IMG src="/Images/OutliningIndicators/None.gif" align=top><html> <IMG src="/Images/OutliningIndicators/None.gif" align=top><head> <IMG src="/Images/OutliningIndicators/None.gif" align=top>  <title>ExcelGenerator testSPAN style="COLOR: #000000">title> <IMG src="/Images/OutliningIndicators/None.gif" align=top>SPAN style="COLOR: #000000">head> <IMG src="/Images/OutliningIndicators/None.gif" align=top><body> <IMG src="/Images/OutliningIndicators/None.gif" align=top><![CDATA[<% <IMG src="/Images/OutliningIndicators/None.gif" align=top>  String sql="select id,source_id,user_label from alarm_state"; <IMG src="/Images/OutliningIndicators/None.gif" align=top>  String columntitle="id#ID&source_id#源设备&user_label#用户标签"; <IMG src="/Images/OutliningIndicators/None.gif" align=top>  session.setAttribute("ExcelGenerator_sql",sql); <IMG src="/Images/OutliningIndicators/None.gif" align=top>  session.setAttribute("ExcelGenerator_columntitle",columntitle); <IMG src="/Images/OutliningIndicators/None.gif" align=top>  response.sendRedirect("asd.xls"); <IMG src="/Images/OutliningIndicators/None.gif" align=top>%>]]> <IMG src="/Images/OutliningIndicators/None.gif" align=top>SPAN style="COLOR: #000000">body> <IMG src="/Images/OutliningIndicators/None.gif" align=top>SPAN style="COLOR: #000000">html></DIV> </html>

posted on 2005-11-06 16:04 一餐三碗阅读(6344) 评论(4) 编辑收藏所属分类: 教程

采用jxl实现数据库结果集导出到excel文件