I have new hand on Android. I have made a report using ListView which is divided into three columns named DateTime, OnOffStatus, AlarmImage.
It work fine and looks good enough but now I want to export this table data to Excel format. Is it possible or not and how?
thanks in advance
Om Parkash Kaushik
Start of by looking at http://poi.apache.org/ and http://poi.apache.org/spreadsheet/index.html
I use this library to all of my excel reports.
Start of by creating a Workbook:
HSSFWorkbook workbook = new HSSFWorkbook();
Map<String, CellStyle> styles = createStyles(workbook);
HSSFSheet sheet = workbook.createSheet();
Setup some style:
private static Map<String, CellStyle> createStyles(Workbook wb) {
Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
CellStyle style;
Font monthFont = wb.createFont();
monthFont.setFontHeightInPoints((short) 11);
monthFont.setColor(IndexedColors.WHITE.getIndex());
style = wb.createCellStyle();
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setFillPattern(CellStyle.SOLID_FOREGROUND);
style.setFont(monthFont);
style.setWrapText(true);
styles.put("header", style);
style = wb.createCellStyle();
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setWrapText(true);
style.setBorderRight(CellStyle.BORDER_NONE);
style.setBorderLeft(CellStyle.BORDER_NONE);
style.setBorderTop(CellStyle.BORDER_NONE);
style.setBorderBottom(CellStyle.BORDER_NONE);
styles.put("cell", style);
return styles;
}
Then setup a header row:
private static final String[] article_headers = {"header1", "header2"};
// Header row
Row headerRow = sheet.createRow(0);
headerRow.setHeightInPoints(40);
Cell headerCell;
for (int i = 0; i < article_headers.length; i++) {
headerCell = headerRow.createCell(i);
headerCell.setCellValue(article_headers[i]);
headerCell.setCellStyle(styles.get("header"));
}
And then you continue with the rows by setting their style and value.
Hope this helps and if you find this helpful, remember to accept.
// Jakob
Related
I have a java code that retrieves the data from the database and copies them to an excel sheet then creates a file,
but all the retrieval data are shown in 1 sheet my problem is to separate them into separated sheets regarding the date, please find my code and advise
List<Excelvo> excelvos = null;
String strDate = "28-02-2021";
String strToDate = "28-03-2021";
Workbook workbook = new XSSFWorkbook();
try {
excelvos = ExcelDao.getInstance().getShabanCodes(100, strDate, strToDate);
} catch (Exception ex) {
Logger.getLogger(CopyToExcel.class.getName()).log(Level.SEVERE, null, ex);
}
// Workbook workbook = new XSSFWorkbook(); // new HSSFWorkbook() for generating `.xls` file
//System.out.println(strDate.substring(0, 5));
/* CreationHelper helps us create instances of various things like DataFormat,
Hyperlink, RichTextString etc, in a format (HSSF, XSSF) independent way */
CreationHelper createHelper = workbook.getCreationHelper();
// Create a Sheet
// for loop to create more than 1 sheet
Sheet sheet = workbook.createSheet(strDate.substring(0, 5));
// Create a Font for styling header cells
Font headerFont = workbook.createFont();
headerFont.setFontHeightInPoints(
(short) 12);
headerFont.setColor(IndexedColors.BLACK.getIndex());
// Create a CellStyle with the font
CellStyle headerCellStyle = workbook.createCellStyle();
headerCellStyle.setFont(headerFont);
headerFont.setBoldweight(headerFont.BOLDWEIGHT_BOLD);
headerCellStyle.setFillBackgroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
headerCellStyle.setAlignment(headerCellStyle.ALIGN_CENTER);
// Create a Row
Row headerRow = sheet.createRow(0);
// Create cells
//for the table header.
for (int i = 0;
i < columns.length;
i++) {
Cell cell = headerRow.createCell(i);
cell.setCellValue(columns[i]);
cell.setCellStyle(headerCellStyle);
}
// Create Cell Style for formatting Date
CellStyle dateCellStyle = workbook.createCellStyle();
dateCellStyle.setDataFormat(createHelper.createDataFormat().getFormat("dd-MM-yyyy HH:mm:ss"));
dateCellStyle.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
dateCellStyle.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);
dateCellStyle.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);
dateCellStyle.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
headerCellStyle.setAlignment(headerCellStyle.ALIGN_CENTER);
dateCellStyle.setBorderBottom(CellStyle.BORDER_THIN);
dateCellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
dateCellStyle.setBorderLeft(CellStyle.BORDER_THIN);
dateCellStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
dateCellStyle.setBorderRight(CellStyle.BORDER_THIN);
dateCellStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
dateCellStyle.setBorderTop(CellStyle.BORDER_THIN);
dateCellStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());
// Create Other rows and cells with employees data
int rowNum = 1;
for (Excelvo excelvo
: excelvos) {
Row row = sheet.createRow(rowNum++);
row.createCell(0)
.setCellValue(excelvo.getCode());
row.createCell(1)
.setCellValue(excelvo.getSentDate());
row.createCell(2)
.setCellValue(excelvo.getCampaign());
row.createCell(3)
.setCellValue(excelvo.getMsisdn());
}
// Resize all columns to fit the content size
for (int i = 0;
i < columns.length;
i++) {
sheet.autoSizeColumn(i);
}
//String excelFilePath = "D:/Excel/MyFirstExcel.xlsx";
//FileInputStream inputStream = new FileInputStream(new File(excelFilePath));
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("sugar sha3ban campaign 2021 code log 28 Feb - 30 Mar.xlsx");
workbook.write(fileOut);
fileOut.close();
I need to separate the data into multiple sheets regarding the date
the retrieved data: each month has data I want to separate this data to put each month with their data in a sheet?
By using MemPOI you can simply execute different queries and bind them to different sheets, letting the db to apply the required filters. MemPOI will take care of the generation. Something like this:
MempoiSheet januarySheet = MempoiSheetBuilder.aMempoiSheet()
.withSheetName("January")
.withPrepStmt(conn.prepareStatement("SELECT * FROM MyTable WHERE date = 'mydate'"))
.build();
MempoiSheet februarySheet = MempoiSheetBuilder.aMempoiSheet()
.withSheetName("February")
.withPrepStmt(conn.prepareStatement("SELECT * FROM MyTable WHERE date = 'mydate 2'"))
.build();
MemPOI memPOI = MempoiBuilder.aMemPOI()
.withAdjustColumnWidth(true)
.addMempoiSheet(januarySheet)
.addMempoiSheet(februarySheet)
.build();
I'm trying to copy from cells from one workbook to another with the latest version of Apache POI (4.1.2).
If both workbooks are .xlsx files, everything works fine. But if the source workbook is an (old) .xls file and the destination workbook is an .xlsx file, the following code fails
// Copy style from old cell and apply to new cell
CellStyle newCellStyle = targetWorkbook.createCellStyle();
newCellStyle.cloneStyleFrom(sourceCell.getCellStyle());
targetCell.setCellStyle(newCellStyle);
The exception that's thrown is:
java.lang.IllegalArgumentException: Can only clone from one XSSFCellStyle to another, not between HSSFCellStyle and XSSFCellStyle
If we can't use cloneStyleFrom when the files (or Workbook objects) are of different types, how can we convert a HSSFCellStyle object to a XSSFCellStyle?
The answer to your question "How can we convert a HSSFCellStyle object to a XSSFCellStyle?" is: We can't do that using apache poi 4.1.2. This simply is not supported as clearly stated in CellStyle.cloneStyleFrom: "However, both of the CellStyles will need to be of the same type (HSSFCellStyle or XSSFCellStyle)."
The other question is: Should we at all convert one cell style into another? Or what use cases are there for CellStyle.cloneStyleFrom at all? In my opinion there are none. There are Excel limitations for the count of unique cell formats/cell styles. See Excel specifications and limits. So we should not create a single cell style for each single cell because then those limitations will be reached very fast. So instead of cloning cell styles we should get the style properties from source style style1 and then using CellUtil.setCellStyleProperties to set those style properties to the other cell in question. This method attempts to find an existing CellStyle that matches the cell's current style plus styles properties in properties. A new style only is created if the workbook does not contain a matching style.
Since your question title is "Copy cells between Excel workbooks with Apache POI", I have created a working draft of how I woud do this.
The following code first gets a existent Workbook.xls as HSSFWorkbook wb1 and creates a new XSSFWorkbook wb2. Then it loops over all cells of the first sheet of wb1 and tries copying those cells into the first sheet of wb2. To do so there is a method copyCells(Cell cell1, Cell cell2) which uses copyStyles(Cell cell1, Cell cell2). The latter gets the style properties from source style style1 got from cell1 and then uses CellUtil.setCellStyleProperties to set those style properties to cell2. For copying fonts copyFont(Font font1, Workbook wb2) is used. This tries creating new fonts in wb2 only if such a font is not already present in that workbook. This is necessary because there also is a limit of unique font types per workbook in Excel.
Working example:
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.util.CellUtil;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.*;
class ExcelCopyCells {
static Font copyFont(Font font1, Workbook wb2) {
boolean isBold = font1.getBold();
short color = font1.getColor();
short fontHeight = font1.getFontHeight();
String fontName = font1.getFontName();
boolean isItalic = font1.getItalic();
boolean isStrikeout = font1.getStrikeout();
short typeOffset = font1.getTypeOffset();
byte underline = font1.getUnderline();
Font font2 = wb2.findFont(isBold, color, fontHeight, fontName, isItalic, isStrikeout, typeOffset, underline);
if (font2 == null) {
font2 = wb2.createFont();
font2.setBold(isBold);
font2.setColor(color);
font2.setFontHeight(fontHeight);
font2.setFontName(fontName);
font2.setItalic(isItalic);
font2.setStrikeout(isStrikeout);
font2.setTypeOffset(typeOffset);
font2.setUnderline(underline);
}
return font2;
}
static void copyStyles(Cell cell1, Cell cell2) {
CellStyle style1 = cell1.getCellStyle();
Map<String, Object> properties = new HashMap<String, Object>();
//CellUtil.DATA_FORMAT
short dataFormat1 = style1.getDataFormat();
if (BuiltinFormats.getBuiltinFormat(dataFormat1) == null) {
String formatString1 = style1.getDataFormatString();
DataFormat format2 = cell2.getSheet().getWorkbook().createDataFormat();
dataFormat1 = format2.getFormat(formatString1);
}
properties.put(CellUtil.DATA_FORMAT, dataFormat1);
//CellUtil.FILL_PATTERN
//CellUtil.FILL_FOREGROUND_COLOR
FillPatternType fillPattern = style1.getFillPattern();
short fillForegroundColor = style1.getFillForegroundColor(); //gets only indexed colors, no custom HSSF or XSSF colors
properties.put(CellUtil.FILL_PATTERN, fillPattern);
properties.put(CellUtil.FILL_FOREGROUND_COLOR, fillForegroundColor);
//CellUtil.FONT
Font font1 = cell1.getSheet().getWorkbook().getFontAt(style1.getFontIndexAsInt());
Font font2 = copyFont(font1, cell2.getSheet().getWorkbook());
properties.put(CellUtil.FONT, font2.getIndexAsInt());
//BORDERS
BorderStyle borderStyle = null;
short borderColor = -1;
//CellUtil.BORDER_LEFT
//CellUtil.LEFT_BORDER_COLOR
borderStyle = style1.getBorderLeft();
properties.put(CellUtil.BORDER_LEFT, borderStyle);
borderColor = style1.getLeftBorderColor();
properties.put(CellUtil.LEFT_BORDER_COLOR, borderColor);
//CellUtil.BORDER_RIGHT
//CellUtil.RIGHT_BORDER_COLOR
borderStyle = style1.getBorderRight();
properties.put(CellUtil.BORDER_RIGHT, borderStyle);
borderColor = style1.getRightBorderColor();
properties.put(CellUtil.RIGHT_BORDER_COLOR, borderColor);
//CellUtil.BORDER_TOP
//CellUtil.TOP_BORDER_COLOR
borderStyle = style1.getBorderTop();
properties.put(CellUtil.BORDER_TOP, borderStyle);
borderColor = style1.getTopBorderColor();
properties.put(CellUtil.TOP_BORDER_COLOR, borderColor);
//CellUtil.BORDER_BOTTOM
//CellUtil.BOTTOM_BORDER_COLOR
borderStyle = style1.getBorderBottom();
properties.put(CellUtil.BORDER_BOTTOM, borderStyle);
borderColor = style1.getBottomBorderColor();
properties.put(CellUtil.BOTTOM_BORDER_COLOR, borderColor);
CellUtil.setCellStyleProperties(cell2, properties);
}
static void copyCells(Cell cell1, Cell cell2) {
switch (cell1.getCellType()) {
case STRING:
/*
//TODO: copy HSSFRichTextString to XSSFRichTextString
RichTextString rtString1 = cell1.getRichStringCellValue();
cell2.setCellValue(rtString1); // this fails if cell2 is XSSF and rtString1 is HSSF
*/
String string1 = cell1.getStringCellValue();
cell2.setCellValue(string1);
break;
case NUMERIC:
if (DateUtil.isCellDateFormatted(cell1)) {
Date date1 = cell1.getDateCellValue();
cell2.setCellValue(date1);
} else {
double cellValue1 = cell1.getNumericCellValue();
cell2.setCellValue(cellValue1);
}
break;
case FORMULA:
String formula1 = cell1.getCellFormula();
cell2.setCellFormula(formula1);
break;
//case : //TODO: further cell types
}
copyStyles(cell1, cell2);
}
public static void main(String[] args) throws Exception {
Workbook wb1 = WorkbookFactory.create(new FileInputStream("Workbook.xls"));
Workbook wb2 = new XSSFWorkbook();
Sheet sheet1 = wb1.getSheetAt(0);
Sheet sheet2 = wb2.createSheet();
Set<Integer> columns = new HashSet<Integer>();
Row row2 = null;
Cell cell2 = null;
for (Row row1 : sheet1) {
row2 = sheet2.createRow(row1.getRowNum());
for (Cell cell1 : row1) {
columns.add(cell1.getColumnIndex());
cell2 = row2.createCell(cell1.getColumnIndex());
copyCells(cell1, cell2);
}
}
wb1.close();
for (Integer column : columns) {
sheet2.autoSizeColumn(column);
}
FileOutputStream out = new FileOutputStream("Workbook.xlsx");
wb2.write(out);
out.close();
wb2.close();
}
}
If Workbook.xls looks like this:
then the resulting Workbook.xlsx looks like this:
Note: This is a working draft and needs to be completed. See TODO comments in the code. RichTextString cell values needs to be considered. Further cell types needs to be considered.
Method copyStyles only provides copying data format, fill pattern and fill foreground color (only for indexed colors), font and borders. Further cell style properties needs to be considered.
Please note: I see a very similar question asked here but that answer was not very conclusive (I can't discern what the actual fix is/was). If someone can explain to me how that question/answer addresses my present issue at hand, I will happily delete this question myself! Just please don't DV/CV as a "dupe", and instead please help me make sense of that provided solution!
Java 8 and POI 4.1.x here. I am trying to write some Java/POI code that will produce a styled/formatted Excel file as output. I have created this GitHub project that perfectly reproduces the issue I'm seeing. If you really want, you can take a look at it and run it (its a Swing app) via ./gradlew clean build shadowJar && java -jar build/libs/hello-windows.jar, but the TLDR; of it is:
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("SOME_SHEET");
Font headerFont = workbook.createFont();
headerFont.setBold(true);
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFont(headerFont);
cellStyle.setFillBackgroundColor(IndexedColors.YELLOW.getIndex());
cellStyle.setAlignment(HorizontalAlignment.CENTER);
int rowNum = 0;
Row headerRow = sheet.createRow(rowNum);
headerRow.setRowStyle(cellStyle);
Cell partNumberHeaderCell = headerRow.createCell(0);
partNumberHeaderCell.setCellValue("Part #");
partNumberHeaderCell.setCellStyle(cellStyle);
Cell partDescriptionHeaderCell = headerRow.createCell(1);
partDescriptionHeaderCell.setCellStyle(cellStyle);
partDescriptionHeaderCell.setCellValue("Description");
Cell partPriceHeaderCell = headerRow.createCell(2);
partPriceHeaderCell.setCellStyle(cellStyle);
partPriceHeaderCell.setCellValue("Price");
Cell manufacturerHeaderCell = headerRow.createCell(3);
manufacturerHeaderCell.setCellStyle(cellStyle);
manufacturerHeaderCell.setCellValue("Make");
rowNum++;
Row nextRow = sheet.createRow(rowNum);
nextRow.createCell(0).setCellValue(uuid);
nextRow.createCell(1).setCellValue("Some Part");
nextRow.createCell(2).setCellValue(2.99);
nextRow.createCell(3).setCellValue("ACME");
FileOutputStream fos = null;
try {
fos = new FileOutputStream("acme.xlsx");
workbook.write(fos);
workbook.close();
} catch (IOException ex) {
log.error(ExceptionUtils.getStackTrace(ex));
}
When this code runs it produces an Excel file that contains all my data (the header row and a "data" row) correctly, however all the formatting and cell styling seems to be ignored:
In the screenshot above, you can see that the header is not styled at all, however I believe I am styling it correctly:
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFont(headerFont);
cellStyle.setFillBackgroundColor(IndexedColors.YELLOW.getIndex());
cellStyle.setAlignment(HorizontalAlignment.CENTER);
If my code is correct then I should see a header that:
Has a yellow background; and
Is horizontally-centered/aligned; and
Is bolded
Can anyone spot where I'm going awry?
Not clear why the bold font not gets applied for you, for me it gets.
But the problem with the cell interior is that Excel cell interiors have pattern fills. There the fill background color is the color behind the pattern and the fill foreground color is the color of the pattern. Solid filled cell interiors must have solid pattern having the needed fill foreground color set.
See also Busy Developers' Guide to HSSF and XSSF Features.
...
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFont(headerFont);
//cellStyle.setFillBackgroundColor(IndexedColors.YELLOW.getIndex());
cellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
cellStyle.setAlignment(HorizontalAlignment.CENTER);
...
Let's have a complete example which will store your data in an Excel sheet:
import java.io.FileOutputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
class CreateExcelCellStyle {
public static void main(String[] args) throws Exception {
try (Workbook workbook = new XSSFWorkbook();
FileOutputStream fileout = new FileOutputStream("./Excel.xlsx") ) {
Font headerFont = workbook.createFont();
headerFont.setBold(true);
CellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFont(headerFont);
headerStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
headerStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
headerStyle.setAlignment(HorizontalAlignment.CENTER);
Object[][] data = new Object[][] {
new Object[] {"Part #", "Description", "Price", "Make"},
new Object[] {"cb82c02", "Some Part", 2.99, "ACME"}
};
Sheet sheet = workbook.createSheet();
for (int r = 0; r < data.length; r++) {
Row row = sheet.createRow(r);
for (int c = 0; c < data[0].length; c++) {
Cell cell = row.createCell(c);
if (r==0) cell.setCellStyle(headerStyle);
Object content = data[r][c];
if (content instanceof String) {
cell.setCellValue((String)content);
} else if (content instanceof Double) {
cell.setCellValue((Double)content);
}
}
}
for (int c = 0; c < data[0].length; c++) {
sheet.autoSizeColumn(c);
}
workbook.write(fileout);
}
}
}
Result:
I wanted to set font of the title row in a spreadsheet bold. I was able to do that in my main function with the following code:
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet dataSheet = workbook.createSheet("Data");
HSSFCellStyle fontStyle = workbook.createCellStyle();
HSSFFont font = workbook.createFont();
font.setBold(true);
fontStyle.setFont(font);
Row row = dataSheet.createRow(0);
Cell cell = row.createCell(0);
cell.setCellStyle(fontStyle);
cell.setCellValue("ID");
Since createCellStyle is method of HSSFWorkbook, if I write to the sheet by calling a function which takes the sheet but not the workbook as parameter, how do I set the cell style?
public class SummaryXlsCreator {
public static void main(String[] args) {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet dataSheet = workbook.createSheet("Data");
writeCDMarker(dataSheet);
}
public static void writeCDMarker(HSSFSheet sheet) {
int rownum = 0;
int cellnum = 0;
Row row = sheet.createRow(rownum++);
Cell cell = row.createCell(cellnum++);
// write first row of sheet "Data"
cell.setCellValue("ID");
}
Use getWorkbook() to get the parent and proceed with the existing code.
sheet.getWorkbbok().createCellStyle();
https://poi.apache.org/apidocs/org/apache/poi/hssf/usermodel/HSSFSheet.html
You can use the static CellUtil.setCellStyleProperties(Cell cell, Map<String, Object> properties) to format your cell without needing a reference to your workbook or sheet.
Example usage:
// Format cell into date time format with "m/d/yy h:mm",
// which is converted to user's locale in Excel.
CellUtil.setCellStyleProperties(cell, Collections.singletonMap(CellUtil.DATA_FORMAT, (short) 22));
I'm using Apache POI to read data in a spreadsheet of part numbers. I look up the part number in our database, if we have a CAD drawing of the part I color the part number cell green, if we don't I color it red. After the processing is done the spreadsheet is saved. The problem I'm having is that every cell in that column comes out green. I've stepped through the code, the logic to look up the part number is working fine and the logic to determine what color the cell should be and setting the color and fill appears to work as well. Any ideas what I'm doing wrong here?
Thanks.
//Check the parts
for(int r=1;r<sheet.getPhysicalNumberOfRows();r++) {
String partNumber = null;
switch(cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
long pNum = (long) cell.getNumericCellValue();
partNumber = String.valueOf(pNum);
break;
case HSSFCell.CELL_TYPE_STRING:
partNumber = cell.getStringCellValue();
break;
default:
logger.info("Part Number at row " + r + " on sheet " + partList.getSheetName(s) + "is of an unsupported type");
}
try {
List<String> oldMaterialNumbers = getOldMaterialNumbers(partNumber);
boolean gotDrawing = checkPartNumber(oldMaterialNumbers, partNumber);
//If there's a drawing then color the row green, if not red.
short bgColorIndex = gotDrawing
?HSSFColor.LIGHT_GREEN.index //42
:HSSFColor.RED.index; //10
HSSFCell curCell = row.getCell(partNumberColumn);
HSSFCellStyle curStyle = curCell.getCellStyle();
curStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
curStyle.setFillForegroundColor(bgColorIndex);
curCell.setCellStyle(curStyle);
}catch(Exception e) {
throw e;
}
}
Short version: Create styles only once, use them everywhere.
Long version: use a method to create the styles you need (beware of the limit on the amount of styles).
private static Map<String, CellStyle> styles;
private static Map<String, CellStyle> createStyles(Workbook wb){
Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
DataFormat df = wb.createDataFormat();
CellStyle style;
Font headerFont = wb.createFont();
headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
headerFont.setFontHeightInPoints((short) 12);
style = createBorderedStyle(wb);
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setFont(headerFont);
styles.put("style1", style);
style = createBorderedStyle(wb);
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setFillForegroundColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.getIndex());
style.setFillPattern(CellStyle.SOLID_FOREGROUND);
style.setFont(headerFont);
style.setDataFormat(df.getFormat("d-mmm"));
styles.put("date_style", style);
...
return styles;
}
you can also use methods to do repetitive tasks while creating styles hashmap
private static CellStyle createBorderedStyle(Workbook wb) {
CellStyle style = wb.createCellStyle();
style.setBorderRight(CellStyle.BORDER_THIN);
style.setRightBorderColor(IndexedColors.BLACK.getIndex());
style.setBorderBottom(CellStyle.BORDER_THIN);
style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
style.setBorderLeft(CellStyle.BORDER_THIN);
style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
style.setBorderTop(CellStyle.BORDER_THIN);
style.setTopBorderColor(IndexedColors.BLACK.getIndex());
return style;
}
then, in your "main" code, set the style from the styles map you have.
Cell cell = xssfCurrentRow.createCell( intCellPosition );
cell.setCellValue( blah );
cell.setCellStyle( (CellStyle) styles.get("style1") );
To create your cell styles see: http://poi.apache.org/spreadsheet/quick-guide.html#CustomColors.
Custom colors
HSSF:
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
HSSFRow row = sheet.createRow((short) 0);
HSSFCell cell = row.createCell((short) 0);
cell.setCellValue("Default Palette");
//apply some colors from the standard palette,
// as in the previous examples.
//we'll use red text on a lime background
HSSFCellStyle style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.LIME.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
HSSFFont font = wb.createFont();
font.setColor(HSSFColor.RED.index);
style.setFont(font);
cell.setCellStyle(style);
//save with the default palette
FileOutputStream out = new FileOutputStream("default_palette.xls");
wb.write(out);
out.close();
//now, let's replace RED and LIME in the palette
// with a more attractive combination
// (lovingly borrowed from freebsd.org)
cell.setCellValue("Modified Palette");
//creating a custom palette for the workbook
HSSFPalette palette = wb.getCustomPalette();
//replacing the standard red with freebsd.org red
palette.setColorAtIndex(HSSFColor.RED.index,
(byte) 153, //RGB red (0-255)
(byte) 0, //RGB green
(byte) 0 //RGB blue
);
//replacing lime with freebsd.org gold
palette.setColorAtIndex(HSSFColor.LIME.index, (byte) 255, (byte) 204, (byte) 102);
//save with the modified palette
// note that wherever we have previously used RED or LIME, the
// new colors magically appear
out = new FileOutputStream("modified_palette.xls");
wb.write(out);
out.close();
XSSF:
XSSFWorkbook wb = new XSSFWorkbook();
XSSFSheet sheet = wb.createSheet();
XSSFRow row = sheet.createRow(0);
XSSFCell cell = row.createCell( 0);
cell.setCellValue("custom XSSF colors");
XSSFCellStyle style1 = wb.createCellStyle();
style1.setFillForegroundColor(new XSSFColor(new java.awt.Color(128, 0, 128)));
style1.setFillPattern(CellStyle.SOLID_FOREGROUND);
I believe it is because cell.getCellStyle initially returns the default cell style which you then change.
Create styles like this and apply them to cells:
cellStyle = (XSSFCellStyle) cell.getSheet().getWorkbook().createCellStyle();
Although as the previous poster noted try and create styles and reuse them.
There is also some utility class in the XSSF library that will avoid the code I have provided and automatically try and reuse styles. Can't remember the class 0ff hand.
checkout the example here
http://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/ss/examples/BusinessPlan.java
style.setFillForegroundColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.getIndex());
For apache POI 3.9 you can use the code bellow:
HSSFCellStyle style = workbook.createCellStyle()
style.setFillForegroundColor(HSSFColor.YELLOW.index)
style.setFillPattern((short) FillPatternType.SOLID_FOREGROUND.ordinal())
The methods for 3.9 version accept short and you should pay attention to the inputs.