采用jxl实现数据库结果集导出到excel文件

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>ExcelGeneratorSPAN style="COLOR: #800000">servlet-name>


<servlet-class>com.fsti.xmnms.web.servlet.ExcelGeneratorSPAN style="COLOR: #800000">servlet-class>


<init-param>


<param-name>pagesizeSPAN style="COLOR: #800000">param-name>


<param-value>5000SPAN style="COLOR: #800000">param-value>


SPAN style="COLOR: #800000">init-param>


<load-on-startup>3SPAN style="COLOR: #800000">load-on-startup>


SPAN style="COLOR: #800000">servlet>


<servlet-mapping>


<servlet-name>ExcelGeneratorSPAN style="COLOR: #800000">servlet-name>


<url-pattern>*.xlsSPAN style="COLOR: #800000">url-pattern>


SPAN style="COLOR: #800000">servlet-mapping>

测试页面：

@ page contentType="text/html;charset=GB2312" language="java" %>]]>


<html>


<head>


<title>ExcelGenerator testSPAN style="COLOR: #000000">title>


SPAN style="COLOR: #000000">head>


<body>




String sql="select id,source_id,user_label from alarm_state";


String columntitle="id#ID&source_id#源设备&user_label#用户标签";


session.setAttribute("ExcelGenerator_sql",sql);


session.setAttribute("ExcelGenerator_columntitle",columntitle);


response.sendRedirect("asd.xls");


%>]]>


SPAN style="COLOR: #000000">body>


SPAN style="COLOR: #000000">html>

]]>