OAF_文件系列5_实现OAF将数据资料导出Excel到本地

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      HttpServletResponse response = (HttpServletResponse) pageContext.getRenderingContext().getServletResponse();
      response.reset();
      response.setContentType("application/vnd.ms-excel;charset=UTF-8");
      String date = pageContext.getCurrentDBDate().toString();
      String filenames = date + "_Export.xls";



      String[] expLabels = new String[] {"公司名称","合同名称","项目分期","付款类型","用款部门","制单人","财务审核人","款项说明","付款单号","收款单位","收款银行","收款账号","实付金额","币种","审批状态","经办日期","付出日期","合同编号","合同内款项","水费","电费","配合费","罚款","其它","发票金额","EAS导出日期"};
      String[] expFields = 
          new String[] { "CompanyName","OkcNumber","ProjectName","TypeName","PayDeptName","LastName","Approver","PaymentDesc","PaymentNumber","VendorName","BankAccountName","BankAccountNum","PaymentAmount","CurrencyCode","StatusDesc","CreationDate","PaymentDate","OkcNumber"};
      Class[] colClasses = new Class[] { null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null};



      OAViewObject expVO = (OAViewObject) am.findViewObject("RptPaymentRequestSummaryVO1");
      
      Number currentPayId = null;
      int inId = expVO.getRangeStart();
      Row currentRow = expVO.getCurrentRow();
      if (expVO == null)
      {
        return;
      }
      try
      {
        OutputStream fileos = response.getOutputStream();
        response.addHeader("Content-Disposition", 
                           (new StringBuilder()).append("attachment;   filename=\"").append(filenames).append("\"").toString());
        WorkbookSettings workbookSettings = new WorkbookSettings();
        WritableWorkbook downLoad = Workbook.createWorkbook(fileos, workbookSettings);
        WritableSheet sheet = downLoad.createSheet("Payment Request Summary", 0);
        
        WritableFont wf_h = new WritableFont(WritableFont.ARIAL, 20, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,Colour.BLUE_GREY); // 定义格式 字体 下划线 斜体 粗体 颜色
        WritableCellFormat wcf_h = new WritableCellFormat(wf_h); // 单元格定义
        wcf_h.setAlignment(Alignment.LEFT); // 设置对齐方式
        wcf_h.setBorder(Border.NONE,BorderLineStyle.NONE);
        
        WritableFont wf_t = new WritableFont(WritableFont.ARIAL, 11, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,Colour.WHITE); // 定义格式 字体 下划线 斜体 粗体 颜色
        WritableCellFormat wcf_t = new WritableCellFormat(wf_t); // 单元格定义
        wcf_t.setBackground(Colour.BLUE_GREY); // 设置单元格的背景颜色
        wcf_t.setAlignment(jxl.format.Alignment.CENTRE); // 设置对齐方式
        wcf_t.setVerticalAlignment(VerticalAlignment.TOP);
        wcf_t.setBorder(Border.ALL,BorderLineStyle.MEDIUM,Colour.GREY_25_PERCENT);
        
        WritableFont wf_cs = new WritableFont(WritableFont.ARIAL, 10, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,Colour.BLACK); // 定义格式 字体 下划线 斜体 粗体 颜色
        WritableCellFormat wcf_cs = new WritableCellFormat(wf_cs); // 单元格定义
        wcf_cs.setAlignment(Alignment.LEFT); // 设置对齐方式
        wcf_cs.setVerticalAlignment(VerticalAlignment.TOP);
        wcf_cs.setWrap(true);
        wcf_cs.setShrinkToFit(true);
        wcf_cs.setBorder(Border.ALL,BorderLineStyle.MEDIUM,Colour.GREY_25_PERCENT);
        
        WritableFont wf_cn = new WritableFont(WritableFont.ARIAL, 10, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,Colour.BLACK); // 定义格式 字体 下划线 斜体 粗体 颜色
        WritableCellFormat wcf_cn = new WritableCellFormat(wf_cn); // 单元格定义
        wcf_cn.setAlignment(Alignment.RIGHT); // 设置对齐方式
        wcf_cn.setVerticalAlignment(VerticalAlignment.TOP);
        wcf_cn.setBorder(Border.ALL,BorderLineStyle.MEDIUM,Colour.GREY_25_PERCENT);
        
        Row row = null;
        Label expLabel = null;

        // 头
        expLabel = new Label(0, 0, "付款情况汇总表", wcf_h);
        sheet.addCell(expLabel);
        sheet.mergeCells(0,0,2,0);
        sheet.setRowView(0, 500);
        
        // 标题
        for (int i = 0, j=0; i < expLabels.length; i++, j++)
        {
          expLabel = new Label(j, 1, expLabels[i], wcf_t);
          sheet.addCell(expLabel);
        }
        sheet.setRowView(1, 400);
        
        // 内容
        row = expVO.first();
        if (row != null)
        {
          for (int i = 0; i < expFields.length; i++)
          {
            colClasses[i] = row.getStructureDef().lookupAttributeDef(expFields[i]).getJavaType();
          }
        }
        expVO.previous();
        
        while (expVO.hasNext())
        {
          row = expVO.next();
          int rowcount = expVO.getCurrentRowIndex() + 2;

          for (int i = 0, j=0; i < expFields.length; i++, j++)
          {
                if (row.getAttribute(expFields[i]) != null)
                {
                  if (colClasses[i].equals(Class.forName("oracle.jbo.domain.Date")))
                  {
                    expLabel = new Label(j, rowcount, ((Date) row.getAttribute(expFields[i])).toString(), wcf_cs);
                  }
                  else if (colClasses[i].equals(Class.forName("oracle.jbo.domain.Number")))
                  {
                    expLabel = new Label(j, rowcount, ((Number) row.getAttribute(expFields[i])).toString(), wcf_cn);
                  }
                  else if (colClasses[i].equals(Class.forName("java.lang.String")))
                  {
                    expLabel = new Label(j, rowcount, (String) row.getAttribute(expFields[i]), wcf_cs);
                  }
                }
                else
                {
                  expLabel = new Label(j, rowcount, "", wcf_cs);
                }            
                sheet.addCell(expLabel);
          }
          currentPayId = (Number) row.getAttribute("PaymentRequestId");
            FeeAmountVOImpl feeVO = am.getFeeAmountVO1();
            
          feeVO.initQuery(currentPayId);
            FeeAmountVORowImpl feeRow = (FeeAmountVORowImpl)feeVO.first();
            feeVO.previous();

             int k = 18;

            while (feeVO.hasNext()){
                feeRow = (FeeAmountVORowImpl)feeVO.next();
                Number feeAmount = feeRow.getFeeAmount();
                expLabel = new Label(k, rowcount, feeAmount.toString(), wcf_cn);
                sheet.addCell(expLabel);
                k++;
            }
          
          if (row.getAttribute("EasDate") != null){

            expLabel = new Label(25, rowcount, ((Date) row.getAttribute("EasDate")).toString(), wcf_cs);
          }
          else {

              expLabel = new Label(25, rowcount, "", wcf_cs);
          }

            sheet.addCell(expLabel);

        }

      sheet.setColumnView(0, 40);
      sheet.setColumnView(1, 25);
      sheet.setColumnView(2, 25);
      sheet.setColumnView(3, 15);
      sheet.setColumnView(4, 25);
      sheet.setColumnView(5, 25);
      sheet.setColumnView(6, 25);
      sheet.setColumnView(7, 40);
      sheet.setColumnView(8, 25);
      sheet.setColumnView(9, 25);
      sheet.setColumnView(10, 25);
      sheet.setColumnView(11, 25);
      sheet.setColumnView(12, 15);

      sheet.setColumnView(13, 10);

      sheet.setColumnView(14, 15);
      sheet.setColumnView(15, 15);
      sheet.setColumnView(16, 25);
      sheet.setColumnView(17, 15);
      sheet.setColumnView(18, 15);
      sheet.setColumnView(19, 15);
      sheet.setColumnView(20, 15);
      sheet.setColumnView(21, 15);
      sheet.setColumnView(22, 15);
      sheet.setColumnView(23, 15);
      sheet.setColumnView(24, 15);
      sheet.setColumnView(25, 25);

      sheet.getSettings().setShowGridLines(false); 
        
        downLoad.write();
        downLoad.close();
        fileos.close();
        response.flushBuffer();
        expVO.setRangeStart(inId);
        expVO.setCurrentRow(currentRow);
        pageContext.setDocumentRendered(false);
      }
      catch (Exception e)
      {
        expVO.setRangeStart(inId);
        expVO.setCurrentRow(currentRow);
        throw new OAException(e.getMessage());
      }
      }