我是POI的新手，我的代码没有给我合适的结果。当填充excel表时，它不会在Date completed列中应用样式，也不会将Date completed列的格式更改为Date （格式应为dd-mmm）。这是我的代码。
package oup.excel.report;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import oup.dbconnection.ConnectionObject;
import util.Mail;
public class CreateExcelReport {
public static void main(String[] args) {
try {
File reportPath = new File("/a1/reports/");
reportPath.mkdirs();
String filename = "/a1/reports/OUP_Delivery_Report_" + getTodaysDate() + ".xls";
HSSFWorkbook hwb = new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet("OUP Delivery Report");
HSSFRow rowhead = sheet.createRow((short) 0);
HSSFFont font = hwb.createFont();
font.setFontName("Trebuchet MS");
font.setFontHeightInPoints((short) 8);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
HSSFCellStyle style = hwb.createCellStyle();
HSSFColor CYAN = setColor(hwb, (byte) 204, (byte) 255, (byte) 255);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setFillForegroundColor(CYAN.getIndex());
//style.setFillBackgroundColor(new HSSFColor.BLACK().getIndex());
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND );
style.setFont(font);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
HSSFCell jrnlcell = rowhead.createCell(0);
HSSFCell uidcell = rowhead.createCell(1);
HSSFCell stepcell = rowhead.createCell(2);
HSSFCell ptcell = rowhead.createCell(3);
HSSFCell dccell = rowhead.createCell(4);
HSSFCell cmtscell = rowhead.createCell(5);
jrnlcell.setCellValue("Journal");
uidcell.setCellValue("Unique ID");
stepcell.setCellValue("Step");
ptcell.setCellValue("Proof typeset pages");
dccell.setCellValue("Date completed");
cmtscell.setCellValue("Comments");
jrnlcell.setCellStyle(style);
uidcell.setCellStyle(style);
stepcell.setCellStyle(style);
ptcell.setCellStyle(style);
dccell.setCellStyle(style);
cmtscell.setCellStyle(style);
Connection con = ConnectionObject.getConnection();
String sql = "SELECT getjrabbr (journalbookid) journal, clientreference UniqueID, (CASE WHEN currentstageid = 11 THEN 'GALLEY' WHEN currentstageid = 1 THEN 'PROOF' WHEN currentstageid = 54 THEN 'FROM T/S' WHEN currentstageid = 2 THEN 'REV1' WHEN currentstageid = 3 THEN 'REV2' WHEN currentstageid = 4 THEN 'REV3' WHEN currentstageid = 14 THEN 'REV4' WHEN currentstageid = 18 THEN 'REV5' WHEN currentstageid = 19 THEN 'REV6' WHEN currentstageid = 20 THEN 'REV7' WHEN currentstageid = 21 THEN 'REV8' WHEN currentstageid = 70 THEN 'REV9' WHEN currentstageid = 71 THEN 'REV10' WHEN currentstageid = 6 THEN 'Supply Files for QA' WHEN currentstageid = 93 THEN 'Resupp QA' WHEN currentstageid = 39 THEN 'PAP' WHEN currentstageid = 99 THEN 'PAP1' WHEN currentstageid = 100 THEN 'PAP2' END) step, tsp Prooftypesetpages, TO_CHAR (CLIENTUPLOADDATE, 'MM/DD/YYYY') Datecompleted FROM v_jobitems_history ji WHERE ji.clientid = 1487 AND CLIENTUPLOADDATE IS NOT NULL AND CLIENTUPLOADDATE BETWEEN TRUNC (SYSDATE - 1) + 3 / 24 AND TRUNC (SYSDATE) + 3 / 24 order by 5";
PreparedStatement pstmt = con.prepareStatement(sql);
ResultSet rs = pstmt.executeQuery();
int i=1;
HSSFCellStyle style1 = hwb.createCellStyle();
HSSFFont font1 = hwb.createFont();
font1.setFontName("Trebuchet MS");
font1.setFontHeightInPoints((short) 8);
style1.setFont(font1);
style1.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style1.setBorderTop(HSSFCellStyle.BORDER_THIN);
style1.setBorderRight(HSSFCellStyle.BORDER_THIN);
style1.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style1.setAlignment(HSSFCellStyle.ALIGN_CENTER);
CellStyle cellStyle = hwb.createCellStyle();
CreationHelper createHelper = hwb.getCreationHelper();
// Set the date format of date
cellStyle.setDataFormat(createHelper.createDataFormat().getFormat("d-mmmm"));
cellStyle.setFont(font1);
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
CellStyle cellStyleInt = hwb.createCellStyle();
cellStyleInt.setDataFormat(createHelper.createDataFormat().getFormat("#"));
cellStyleInt.setFont(font1);
cellStyleInt.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyleInt.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyleInt.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyleInt.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyleInt.setAlignment(HSSFCellStyle.ALIGN_CENTER);
while(rs.next()){
String journal = rs.getString("journal");
String UniqueID = rs.getString("UniqueID");
String step = rs.getString("step");
String tsp = rs.getString("Prooftypesetpages");
String Datecompleted = rs.getString("Datecompleted");
System.out.println("journal : " + journal);
System.out.println("UniqueID : " + UniqueID);
System.out.println("step : " + step);
System.out.println("tsp : " + tsp);
System.out.println("Datecompleted : " + Datecompleted);
System.out.println("================================================");
HSSFRow row = sheet.createRow((short) i);
HSSFCell jcell = row.createCell(0);
HSSFCell ucell = row.createCell(1);
HSSFCell scell = row.createCell(2);
HSSFCell tcell = row.createCell(3);
HSSFCell dcell = row.createCell(4);
HSSFCell ccell = row.createCell(5);
tcell.setCellType(Cell.CELL_TYPE_NUMERIC);
jcell.setCellValue(journal);
ucell.setCellValue(UniqueID);
scell.setCellValue(step);
if(tsp!=null && !tsp.equals("")){
tcell.setCellValue(Integer.parseInt(tsp.trim()));
}else{
tcell.setCellValue(0);
}
SimpleDateFormat oldFormat = new SimpleDateFormat("dd/MM/yyyy");
SimpleDateFormat newFormat = new SimpleDateFormat("dd-MMM");
String reformattedDt = null;
Date inputDt = null;
try {
reformattedDt = newFormat.format(oldFormat.parse(Datecompleted));
inputDt = newFormat.parse(reformattedDt);
} catch (ParseException e) {
e.printStackTrace();
}
dcell.setCellValue(inputDt);
ccell.setCellValue("");
jcell.setCellStyle(style1);
ucell.setCellStyle(style1);
scell.setCellStyle(style1);
tcell.setCellStyle(cellStyleInt);
dccell.setCellStyle(cellStyle);
ccell.setCellStyle(style1);
i++;
}
try{
if(rs!=null){
rs.close();
}
if(pstmt!=null){
pstmt.close();
}
if(con!=null){
con.close();
}
}catch (Exception e) {
e.printStackTrace();
}
for(int j=0;j<6;j++){
sheet.autoSizeColumn((short) j);
}
FileOutputStream fileOut = new FileOutputStream(filename);
hwb.write(fileOut);
fileOut.close();
Mail mail = new Mail();
boolean sendmail = mail.sendMailWithAttachHtmlFormat("dbadmin@aptaracorp.com", "abc@abc.com", "abc@aabc.com", "OUP daily delivery report", "<p style='color:blue'>Hi, <br/>Please find the daily delivery report for the articles.</p><br/><p style='color:blue'>Thanks,<br/>Aptara Automailer</p>", filename, "", "DBADMIN");
if(sendmail){
System.out.println("Mail sent successfully.");
}
System.out.println("Your excel file has been generated!");
}
catch(FileNotFoundException fnf){
if(fnf.getMessage().indexOf("The process cannot access the file because it is being used by another process")>=0){
System.out.println("The file is already being used by another process. Please close the file and try again.");
}else{
System.out.println("Exception occured : " + fnf.getMessage());
}
}
catch (Exception ex) {
ex.printStackTrace();
}
}
private static String getTodaysDate(){
Date date = new Date();
SimpleDateFormat sdf;
sdf = new SimpleDateFormat("ddMMMyyyy_hh_mm_ss");
String dtString = sdf.format(date);
return dtString;
}
private static HSSFColor setColor(HSSFWorkbook workbook, byte r,byte g, byte b){
HSSFPalette palette = workbook.getCustomPalette();
HSSFColor hssfColor = null;
try {
hssfColor= palette.findColor(r, g, b);
if (hssfColor == null ){
palette.setColorAtIndex(HSSFColor.LAVENDER.index, r, g,b);
hssfColor = palette.getColor(HSSFColor.LAVENDER.index);
}
} catch (Exception e) {
e.printStackTrace();
}
return hssfColor;
}
}
请给我一个合适的解决方案。
由于
Saikat
答案 0 :(得分：2)
您正在创建HSSFCell dcell以将日期值存储在while循环中。但是，这个单元格的样式从未设置过。
你的行
dccell.setCellStyle(cellStyle);
设置标题单元格的单元格样式（“dccell”），而不是实际日期值单元格的样式（“dcell”）。