Apache POI需要很长时间才能生成Excel表单

package efms.bizobj; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import java.util.Random; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import efms.db.bean.PsatMetricsDrillDown2ActionList; import efms.db.bean.PsatMetricsDrillDown2Bean; import efms.log.EfmsLogger; public class DrillDown2ExcelReport { public void generateHeader1(HSSFWorkbook wb, HSSFSheet sheet, String name,List<PsatMetricsDrillDown2Bean> records) { EfmsLogger.debug("Inside generateHeader1"); HSSFRow row = sheet.createRow(0); HSSFCell cell; int count = 14; row = sheet.createRow(0); cell = row.createCell(0); cell.setCellValue("USO Number"); cell = row.createCell(1); cell.setCellValue("CLCI"); cell = row.createCell(2); cell.setCellValue("CLO"); cell = row.createCell(3); cell.setCellValue("OCO CLLI"); cell = row.createCell(4); cell.setCellValue("Service Type"); cell = row.createCell(5); cell.setCellValue("Order Action"); cell = row.createCell(6); cell.setCellValue("Order Status"); cell = row.createCell(7); cell.setCellValue("Test Section"); cell = row.createCell(8); cell.setCellValue("Test Status"); cell = row.createCell(9); cell.setCellValue("Condition Code and Desc"); cell = row.createCell(10); cell.setCellValue("Details on Failure Reason"); cell = row.createCell(11); cell.setCellValue("CKL Number"); cell = row.createCell(12); cell.setCellValue("Test Triggered Date/Time"); cell = row.createCell(13); cell.setCellValue("Trigger"); cell = row.createCell(14); cell.setCellValue("Trigger Name"); for(int i =0 ;i <= count ;i ++) sheet.autoSizeColumn(i); } public void insertReportData(HSSFWorkbook wb, HSSFSheet sheet, String name,List<PsatMetricsDrillDown2Bean> records,String failType) { HSSFRow row ; HSSFCell cell; String clci ; String clo; int orderType; String usoNumber ; int svcOrderId ; String serviceType; String ocoClli ; String orderAction; String orderStatus; String testStatus ; String conditionCode ; String conditionCodeDesc ; String cklNum ; String triggerDateTime ; String trigger ; String triggerName ; for(int i=0 ; i < records.size() ;i ++){ clci =" "; clo =" "; orderType = -1; usoNumber = " "; svcOrderId = -1; serviceType = " "; ocoClli = " "; orderAction = " "; orderStatus = " "; testStatus = " "; conditionCode = " "; conditionCodeDesc = " "; cklNum = " " ; triggerDateTime = " "; trigger = " "; triggerName = " "; if(records.get(i).getClci() != null) clci = records.get(i).getClci(); if(records.get(i).getClo() != null) clo = records.get(i).getClo(); if(records.get(i).getOrderType() != -1) orderType = records.get(i).getOrderType(); if(records.get(i).getUsoNumber() != null) usoNumber = records.get(i).getUsoNumber(); if(records.get(i).getSvcOrderId() != -1) svcOrderId = records.get(i).getSvcOrderId(); if(records.get(i).getServiceType() != null) serviceType = records.get(i).getServiceType(); if(records.get(i).getOcoClli() != null) ocoClli = records.get(i).getOcoClli(); if(records.get(i).getOrderAction() != null) orderAction = records.get(i).getOrderAction(); if(records.get(i).getOrderStatus() != null) orderStatus = records.get(i).getOrderStatus(); if(records.get(i).getTestStatus() != null) testStatus = records.get(i).getTestStatus(); if(records.get(i).getConditionCode() != null) conditionCode = "("+ records.get(i).getConditionCode()+")"; if(records.get(i).getConditionCodeDescription() != null) conditionCodeDesc = records.get(i).getConditionCodeDescription(); if(records.get(i).getCklNumber() != null) cklNum = records.get(i).getCklNumber(); if(records.get(i).getTrigDateTime() != null) triggerDateTime = records.get(i).getTrigDateTime(); if(records.get(i).getTrigger() != null) trigger = records.get(i).getTrigger(); if(records.get(i).getTriggerName() != null) triggerName = records.get(i).getTriggerName(); row = sheet.createRow(i+1); cell = row.createCell(0); cell.setCellValue(usoNumber); sheet.autoSizeColumn(0); cell = row.createCell(1); cell.setCellValue(clci); sheet.autoSizeColumn(1); cell = row.createCell(2); cell.setCellValue(clo); sheet.autoSizeColumn(2); cell = row.createCell(3); cell.setCellValue(ocoClli); sheet.autoSizeColumn(3); cell = row.createCell(4); cell.setCellValue(serviceType); sheet.autoSizeColumn(4); cell = row.createCell(5); cell.setCellValue(orderAction); sheet.autoSizeColumn(5); cell = row.createCell(6); cell.setCellValue(orderStatus); sheet.autoSizeColumn(6); cell = row.createCell(7); cell.setCellValue(failType); sheet.autoSizeColumn(7); cell = row.createCell(8); cell.setCellValue(testStatus); sheet.autoSizeColumn(8); cell = row.createCell(9); cell.setCellValue(conditionCode + conditionCodeDesc); sheet.autoSizeColumn(9); if(records.get(i).getActionList()!=null){ for(PsatMetricsDrillDown2ActionList p: records.get(i).getActionList()) { cell = row.createCell(10); cell.setCellValue(p.getActionName() + " - " + p.getActionReason()); sheet.autoSizeColumn(10); } }else{ cell = row.createCell(10); cell.setCellValue(" "); sheet.autoSizeColumn(10); } cell = row.createCell(11); cell.setCellValue(cklNum); sheet.autoSizeColumn(11); cell = row.createCell(12); cell.setCellValue(triggerDateTime); sheet.autoSizeColumn(12); cell = row.createCell(13); cell.setCellValue(trigger); sheet.autoSizeColumn(13); cell = row.createCell(14); cell.setCellValue(triggerName); sheet.autoSizeColumn(14); } } public String generateDD2ExcelReport(List<PsatMetricsDrillDown2Bean> records,String failType){ HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet dd2ExcelSheet = wb.createSheet("DrillDown2 Report"); generateHeader1(wb,dd2ExcelSheet,"DrillDown2 Report",records); insertReportData(wb,dd2ExcelSheet,"DrillDown2 Report",records,failType); FileOutputStream fileOut; Random rand = new Random(); String fileName = ""; String fileLocation = "" ; boolean fileExists = true; try { do{ fileName = "DrillDown2" + rand.nextInt(10000000)+"Report.xls"; fileLocation = "/opt/www/data/psat_report" + File.separator + fileName; fileExists = new File(fileLocation).exists(); }while(fileExists); fileOut = new FileOutputStream(fileLocation); String path = new File(fileLocation).getAbsolutePath(); wb.write(fileOut); fileOut.close(); } catch (IOException e) { e.printStackTrace(); } return fileName; } } 

此代码用于生成Excel报告。 有15列，如果logging数量在1000左右，生成Excel表格需要10-15分钟左右的时间。 上面的代码有问题吗？ 如何提高性能（减lessExcel报表生成时间）？

Answer 1

sheet.autoSizeColumn（）方法可能需要一些时间 – 并且在添加到表单的每一条数据之后调用它。 尝试删除所有的调用，并在代码的最后做autosize – 每个列只需要一次。