在J2EE应用开发中，由于各种各样的原因，经常会需要处理一些旧的Excel格式电子表格数据，或者是生成电子表格。

　　处理Excel电子表格的方法比如多，比如可以使用jdbc来像读数据库中的数据一样来读取电子表格的内容。这里演示的是使用开源的电子表格处理工具jxl，即Java Excel API来进行处理。关于jxl及相关使用，可以在网上搜索到很多资料。这里只是简单演示在EasyJWeb中的使用方法，这是前段时间公司一个项目中的应用，需要生成一特定的Excel表格，供客户端下载。

　　WEB MVC中Action中的代码如下：

public class PersonChangeAction extends BaseCrudAction {

private ExcelReportService excelReportService=ExcelReportService.getInstance();

public Page doDownloadMenu(WebForm form, Module module)throws Exception {   String town=CommUtil.null2String(form.get("queryTown"));   String village=CommUtil.null2String(form.get("queryVillage"));   String team=CommUtil.null2String(form.get("queryTeam"));   String belongDept="";   ActiveUser user=(ActiveUser)this.getCurrentUser(form);     if(!userService.checkAdmin(user))   {     belongDept=user.getDept();   }     ActionContext.getContext().getResponse().setContentType("application/x-msdownload");   String fileName="XXXXX人员名单";   if(!"".equals(town))fileName+="-"+town;   if(!"".equals(village))fileName+="-"+village;   if(!"".equals(team))fileName+="-"+team;   fileName+=".xls";   ActionContext.getContext().getResponse().setHeader("Content-Disposition","attachment; filename=/""+new String(fileName.getBytes("gbk"),"iso8859-1")+"/"");   java.io.OutputStream out=com.easyjf.web.ActionContext.getContext().getResponse().getOutputStream();   excelReportService.personChangeExcelList(out, belongDept, town, village, team);   return null;  }

..

}

 

Action中的doDownloadMenu对应downloadMenu命令，这段代码注要实现了向客户端返回二进制流文件的功能，注意一些细节。其中流中的内容，即Excel表格的内容，通过ExcelReportService的personChangeExcelList方法来处理，该方法属于业务逻辑层，主要功能是把符合条件的对象，添加到Excel表格中，这个方法内容大致如下：

 

public synchronized void personChangeExcelList(java.io.OutputStream out,String belongDept,String town,String village,String team)  {    String scope = "1=1";    String scope1="1=1";   Collection paras = new ArrayList();     //省略部分查询代码

  if(!"1=1".equals(scope))scope1+=" and personId in (select cid as personId from person where "+scope+") ";   DbPageList pList = new DbPageList(PersonChange.class, scope1, paras);   pList.doList(1, 500);   try{   jxl.write.WritableWorkbook book=jxl.Workbook.createWorkbook(out);   jxl.write.WritableSheet sheet=book.createSheet("XXXX人员名单", 0);   int pages=pList.getPages();   String[] lables={"姓名","镇(乡、街道)","村(居委)","组","户主","就业方式","就业转移时间","就业转移地点","就业单位","就业工资","就业工种","联系电话"};   for(int l=0;l    sheet.addCell(new jxl.write.Label(l,0,lables[l]));   int row=1;     for(int p=1;p<=pages;p++)   {    pList = new DbPageList(PersonChange.class, scope1, paras);    pList.doList(p, 500);    List list=pList.getResult();       for(int i=0;i    {    PersonChange change=(PersonChange)list.get(i);      Person person=(Person)this.dao.get(Person.class,change.getPersonId());     sheet.addCell(new jxl.write.Label(0,row,person.getTrueName()));    sheet.addCell(new jxl.write.Label(1,row,person.getTown()));    sheet.addCell(new jxl.write.Label(2,row,person.getVillage()));    sheet.addCell(new jxl.write.Label(3,row,person.getTeam()));    sheet.addCell(new jxl.write.Label(4,row,person.getHouseholderName()));    sheet.addCell(new jxl.write.Label(5,row,logic.showTitle("getWorkType", change.getWorkType())));    sheet.addCell(new jxl.write.Label(6,row,CommUtil.format(change.getTransferTime())));    String workPlace=logic.showTitle("workplace", change.getWorkPlace());    if("".equals(workPlace))workPlace= change.getWorkPlace();    sheet.addCell(new jxl.write.Label(7,row,workPlace));    sheet.addCell(new jxl.write.Label(8,row,change.getWorkDept()));    sheet.addCell(new jxl.write.Label(9,row,logic.showTitle("workSalary", change.getWorkSalary())));    sheet.addCell(new jxl.write.Label(10,row,logic.showTitle("skills", change.getWorkSubject())));    sheet.addCell(new jxl.write.Label(11,row,change.getTel()));       row++;    }      }     book.write();   book.close();   }   catch(Exception e)   {    e.printStackTrace();   }  }