Struts2框架中怎么把从数据库中读取的数据生成文件，并在客户端保存

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TestXL.jsp

<%@page  contentType="text/html;  charset=GBK"%>
<%@taglib  uri="/WEB-INF/struts-html.tld"  prefix="html"%>
<html:html>
   <html:button  property="button"  onclick="printAll()">DownLoad</html:button>
</html:html>
<script  language='javascript'  type="text/javascript">
function  printAll(){
   location.href="<%=request.getContextPath()%>/downloadAction.do";
}
</script>

 

ExcelBean:

import  java.io.*;
import  jxl.*;
import  jxl.write.*;
import  jxl.format.*;
import  java.util.*;
import  javax.servlet.http.HttpServletResponse;

/*
用于Struts结构中的Excel文件写操作，当但击“导出按钮”时可以直接在客户端导出Excel文件并提示保存
使用方法：
在action类中加入：
ExcelBean  eb  =  new  ExcelBean();
if(vect.size()>0){
   eb.exportToExcel(response,  fname,  sheetname,  titles,  vect);  //调用生成excel文件bean
}
参数：
response:action类中的HttpServletResponse;
filename:要生成的保存的缺省的Excel文件名
sheetname:要保存的工作表的名称
titles:工作表中的表格横向标题
vect:数据行
*/

public  class  ExcelBean  {
       public  ExcelBean()  {}
       public  boolean  exportToExcel(HttpServletResponse  response,String  filename,String  sheetname,String[]  titles,Vector  vect)  throws  Exception  {
               OutputStream  os  =  null;
               boolean  b1  =  true  ;
               try  {
                       os  =  response.getOutputStream();  //取得输出流
                       response.reset();  //清空输出流
                       response.setHeader("Content-disposition","attachment;  filename="  +  filename  +  ".xls");  //设定输出文件头
                       response.setContentType("application/msexcel");  //定义输出类型
               }  catch  (IOException  ex)  {
                       b1=  false;
                       System.out.println("流操作错误:"+ex.getMessage());
               }
               WritableWorkbook  workbook  =  null;
               try  {
                       //创建新的Excel  工作簿
                       workbook  =  Workbook.createWorkbook(os);
                       //在Excel工作簿中建一工作表，其名为:第一页
                       jxl.write.WritableSheet  wsheet  =  workbook.createSheet(sheetname,  0);  //sheet();
                       WritableFont  font  =  new  WritableFont(WritableFont.ARIAL,  14,
                                                                                                 WritableFont.BOLD,  false,
                                                                                                 jxl.format.UnderlineStyle.
                                                                                                 NO_UNDERLINE,
                                                                                                 jxl.format.Colour.BLACK);
                       WritableCellFormat  format  =  new  WritableCellFormat(font);
                       for  (int  i  =  0;  i  <  titles.length;  i++)  {
                               Label  wlabel1  =  new  Label(i,  0,  titles[i],  format);  //行、列、单元格中的文本、文本格式
                               wsheet.addCell(wlabel1);
                       }
                       font  =  new  jxl.write.WritableFont(WritableFont.createFont("宋体"),  12,
                                                                                           WritableFont.NO_BOLD,  false,
                                                                                           jxl.format.UnderlineStyle.
                                                                                           NO_UNDERLINE,
                                                                                           jxl.format.Colour.BLACK);
                       format  =  new  jxl.write.WritableCellFormat(font);
                       for  (int  i  =  0;  i  <  vect.size();  i++)  {  //  在索引0的位置创建行（最顶端的行）
                               String[]  sdata  =  (String[])  vect.elementAt(i);
                               for  (int  j  =  0;  j  <  sdata.length;  j++)  {  //在索引0的位置创建单元格（左上端）
                                       Label  wlabel1  =  new  Label(j,  i,  sdata[j],  format);  //行、列、单元格中的文本、文本格式
                                       wsheet.addCell(wlabel1);
                                       System.out.println(sdata[j]  +  ":::"  +  sdata[j]);
                               }
                       }
                       workbook.write();  //写入文件
               }  catch  (WriteException  ex1)  {
                       b1  =  false;
                       System.out.println("WriteException:"+ex1.getMessage());
               }  catch  (IOException  ex2)  {
                       b1  =  false;
                       System.out.println("IOException:"+ex2.getMessage());
               }
               workbook.close();
               os.close();
               return  b1;
       }
}

 

DownloadAction:

import  org.apache.struts.action.*;
import  javax.servlet.http.*;
import  com.segsec.base.ExcelBean;
import  com.segsec.data.basedata;
import  java.util.Vector;

/**
 *  <p>Title:DownloadAction  </p>
 *  <p>Description:  QRRSMMS  </p>
 *  <p>Copyright:  Copyright  (c)  2004  jiahansoft</p>
 *  <p>Company:  jiahansoft</p>
 *  @author  wanghw
 *  @version  1.0
 */

public  class  DownloadAction  extends  Action  {
       public  ActionForward  execute(ActionMapping  mapping,
                                                                 ActionForm  form,
                                                                 HttpServletRequest  request,
                                                                 HttpServletResponse  response)  throws  Exception  {
               basedata  databean  =  new  basedata();
               Vector  vect  =  new  Vector();
               boolean  b1=  false;
               try  {
                       String  fname  =  "test";  //Excel文件名
                       String[]  titles  =  {"车牌号",  "车辆类型",  "用户帐号",  "车台号"};  //标题
                       String  sheetname  =  "车辆列表";
                       ExcelBean  eb  =  new  ExcelBean();
                       vect  =  databean.QuerySimilarVehicleInfoByAdminer();
                       if(vect.size()>0){
                               b1  =  eb.exportToExcel(response,  fname,  sheetname,  titles,  vect);  //调用生成excel文件bean
                       }
               }  catch  (Exception  e)  {
                       System.out.println(e);
               }
               if(b1){
                       return  mapping.findForward("display");
               }else{
                       return  mapping.findForward("failure");
               }
       }
}

 

basedata:

import  java.sql.PreparedStatement;
import  java.util.Vector;
import  java.sql.DriverManager;
import  java.sql.ResultSet;
import  java.sql.Connection;

public  class  basedata  {
       public  Vector  QuerySimilarVehicleInfoByAdminer(){
           Vector  vect  =    new  Vector();
           int  i  =  0;
           Connection  conn  =  null;
           PreparedStatement  pstam  =null;
           ResultSet  rs  =null;
           String  url  =  "jdbc:oracle:thin:@90.0.8.2:1521:ORCL";
           String  username  =  "gisap";
           String  password  =  "1";
           String  drivers  =  "oracle.jdbc.driver.OracleDriver";
 
           String  sqlStr  =  "SELECT    V.NUMBER_PLATE,v.vehicletype,A.ADMINER,U.CALL_LETTER  "
                                       +"  FROM          T_ADMINER_UNIT  AU,T_ADMINER  A,T_VEHICLE  V,T_UNIT  U  "
                                       +"  WHERE        A.ADMINERID=AU.ADMINERID"
                                       +"    AND        A.ADMINER  ='master'  "
                                       +"    AND        AU.UNITID  =  U.UNITID  "
                                       +"    AND        U.UNITID  =  V.UNITID  "
                                       +"  ORDER  BY  V.NUMBER_PLATE  ";
           try{
               Class.forName(drivers);
               conn  =  DriverManager.getConnection(url,  username,  password);
               pstam  =  conn.prepareStatement(sqlStr);
               rs  =  pstam.executeQuery();
               int  collength  =  rs.getMetaData().getColumnCount();
               while  (rs.next())  {
                   collength  =  rs.getMetaData().getColumnCount();
                   String[]  rowdata  =  new  String[collength];
                   for  (int  k  =  1;  k  <=  collength;  k++)  {
                       rowdata[k  -  1]  =  rs.getString(k);  //new  String(rs.getString(k).getBytes("ISO-8859-1"),  "GBK");  //
                   }
                   vect.add(rowdata);
               }
           }catch(Exception  e){
               System.out.println("QuerySimilarVehicleInfoByAdminer  Error!"+e.getMessage());
           }
           finally{
               try{
                   rs.close();
                   pstam.close();
                   conn.close();
               }catch(Exception  e){}
           }
           return  vect;
       }
       public  static  void  main(String[]  args)  {
               basedata  basedata  =  new  basedata();
       }
}

 

 

在struts-config.xml文件的<action-mappings></action-mappings>段中加入：

       <action  type="com.segsec.action.DownloadAction"  path="/downloadAction">
           <forward  name="display"  path="/welcome.jsp"  />
       </action>

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