I am building a function that reads the data available in the excel file.
I use Apache POI with the Spring project.
However, I am having trouble reading with merge cells. What I need is to get the content highlighted in red as shown in the picture.
Can you suggest me the code?
Thanks !
Update:
`
public void importClassroomByExcel(MultipartFile file) {
try {
Workbook workbook = new HSSFWorkbook(file.getInputStream());
Iterator<Sheet> sheetIterator = workbook.iterator();
while (sheetIterator.hasNext()) {
Sheet sheet = sheetIterator.next();
String title = sheet.getRow(4).getCell(5).toString();
}
workbook.close();
} catch (Exception e) {
throw new BadRequestAlertException(ErrorConstants.DEFAULT_TYPE, "", e.getMessage(), "filestructerror",
Status.BAD_REQUEST);
}
}
`
Not sure I understand your requirement correct. This is what I think you want: In your sheet, the data range starts in row 5 and column A determines the grouping. Now the need is getting the values of columns F and G for each group. Then the need is getting the first date for each group in column N and the last date for each group in column O.
So the need is to get the first row for each group and the last filled row for each group. Following example shows this. Mainly it uses a method int getNextFilledRow(Sheet sheet, int columnNum, int startRowNum) to get the next filled row in a given column of the sheet starting on a given row number.
The code should only get the cells having the red marked contents in your given sheet.
import java.io.FileInputStream;
import org.apache.poi.ss.usermodel.*;
class ReadExcelMergedCells {
static int getNextFilledRow(Sheet sheet, int columnNum, int startRowNum) {
int lastRow = sheet.getLastRowNum();
int nextFilledRow = lastRow;
for (int r = startRowNum; r <= lastRow; r++) {
nextFilledRow = r + 1;
Row row = sheet.getRow(nextFilledRow);
Cell cell = (row != null)?cell = row.getCell(columnNum):null;
if (cell != null && cell.getCellType() != CellType.BLANK) {
break;
}
}
return nextFilledRow;
}
public static void main(String[] args) throws Exception {
Workbook workbook = WorkbookFactory.create(new FileInputStream("./Excel.xlsx"));
Sheet sheet = workbook.getSheetAt(0);
int lastRow = sheet.getLastRowNum();
int startRow = 4;
Row row = null;
Cell cell = null;
int columnNum = -1;
int columNumA = 0; //column A determines the grouping
for (int r = startRow; r <= lastRow; r = getNextFilledRow(sheet, columNumA, r)) {
//r is the first row in this group
System.out.println("Group starting in row " + r);
//get cell in column F of first row in this group
columnNum = 5;
row = sheet.getRow(r);
cell = (row != null)?cell = row.getCell(columnNum):null;
System.out.println(cell);
//get cell in column G of first row in this group
columnNum = 6;
row = sheet.getRow(r);
cell = (row != null)?cell = row.getCell(columnNum):null;
System.out.println(cell);
//get cell in column N of first row in this group
columnNum = 13;
row = sheet.getRow(r);
cell = (row != null)?cell = row.getCell(columnNum):null;
System.out.println(cell);
//get cell in column O of last filled row in this group
columnNum = 14;
int lastRowInGroup = getNextFilledRow(sheet, columNumA, r) -1;
// get last filled cell in this group
for (int rl = lastRowInGroup; rl >= r; rl--) {
row = sheet.getRow(rl);
cell = (row != null)?cell = row.getCell(columnNum):null;
if (cell != null && cell.getCellType() != CellType.BLANK) {
break;
}
}
System.out.println(cell);
System.out.println("Group ending in row " + lastRowInGroup);
}
workbook.close();
}
}
Code to change color of cell to red:
CellStyle cellStyle = cell.getCellStyle();
Font font = workbook.createFont();
font.setFontName("Times New Roman");
font.setColor(IndexedColors.RED.index);
cellStyle.setFont(font);
cellStyle.setFillBackgroundColor(IndexedColors.BLUE.index);
cell.setCellStyle(cellStyle);
To merge from B2 to E2:
sheet.addMergedRegion(new CellRangeAddress(1,1,1,4));
See more in :
Changing cell color using apache poi
How to get the font style of a cell field of excel in Java, Apache POI?
Using custom colors with SXSSF (Apache POI)
Merging cells in Excel using Apache POI
Related
I am trying to make use of Apache POI to read an excel file and convert it to a 2-dimensional object array. Attached is the code section.
Workbook workbook = new XSSFWorkbook(inputStream);
Sheet firstSheet = workbook.getSheetAt(1);
int numRows = 3;
int cols = 5;
double[][] excelData = new double[numRows][cols];
for (int i = 1; i < numRows; i++) {
Row row = firstSheet.getRow(i);
if (row != null) {
for (int j = 1; j < cols; j++) {
Cell cell = row.getCell(j);
if (cell != null) {
try {
excelData[i][j] = cell.getNumericCellValue();
} catch (IllegalStateException e) {
System.out.println("Cell data is not a double");
}
}
}
}
}
workbook.close();
inputStream.close();
return excelData;
}
enter image description here This is my excel sheet and I want to "just" read the blue part of it as a 2d array, but after running the code the first row and column all are zero and I don't want it, appreciate your help on how can quickly pull out all the zeros enter image description here.
You need to change index in the 1st loop to 0 (first field in excel file)
but in row you must provide index + 1 bc you need to read from the 2nd field.
Same analogy for 2nd loop and cell field
Workbook workbook = new XSSFWorkbook(new File("d:\\book1.xlsx"));
Sheet firstSheet = workbook.getSheetAt(1);
int numRows = 3;
int cols = 5;
double[][] excelData = new double[numRows][cols];
for (int i = 0; i < numRows; i++) {
Row row = firstSheet.getRow(i + 1);
if (row != null) {
for (int j = 0; j < cols; j++) {
Cell cell = row.getCell(j + 1);
if (cell != null) {
try {
if (cell.getCellType().equals(CellType.NUMERIC)) {
excelData[i][j] = Double.valueOf(cell.getNumericCellValue());
}
} catch (IllegalStateException e) {
System.out.println("Cell data is not a double");
}
}
}
}
}
workbook.close();
Returned result for it:
0.041256 0.033079 -0.01138 -0.02138 -0.01138
0.041256 0.033079 -0.01138 -0.01138 -0.01138
0.020628 0.01654 -0.00569 -0.10569 -0.00569
I want to read .xlsx file to get values in every row with specific column name's and keep them into string array.
Sample data from file.xlsx
A B C
A123 B123 C123
A456 B456 C456
A789 B789 C789
A999
This is the code that try to get values from column A, but it's not get the correct result.
InputStream is = file.getInputstream();
int rowTotal = 0;
XSSFWorkbook wb = new XSSFWorkbook(is);
XSSFSheet sheet = wb.getSheetAt(0);
XSSFRow row = sheet.getRow(0);
rowTotal = sheet.getLastRowNum();
if((rowTotal > 0) || (sheet.getPhysicalNumberOfRows() > 0)) {
rowTotal++;
log.debug("rowTotal : "+rowTotal);
int colNum = -1;
for(int i = 0; i <= rowTotal; i++) {
if(row.getCell(i).getStringCellValue().trim().equals("A"))
colNum = i;
row = sheet.getRow(i+1);
XSSFCell cellA = row.getCell(colNum);
DataFormatter formatter = new DataFormatter();
String valueA = formatter.formatCellValue(cellA);
log.debug("Data from col A : "+valueA);
}
}
}
The result from log are..
rowTotal : 5
Data from col A : A123
Data from col A : A456
Data from col A : A789
Why it's not print "A999" ?
Hi I am using autoFilter for filtering all Columns in Excell,it's considering all the blank rows (rows beyond the total no of rows having data) while filtering. but, i want to avoid considering Blank rows while i am trying to filter any column.
I am using below code,
sheet.setAutoFilter(CellRangeAddress.valueOf("A8:L13"));
I am currently getting like this
I need like this
The AutoFilter [ ] (Blanks) option only disappears if there are not blank cells in the filter range. So we need setting the AutoFilter cell range only to the used range.
Example:
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import java.util.Random;
import java.io.*;
class AutoFilterTest {
private static void setCellData(Sheet sheet) {
Row row = sheet.createRow(0);
Cell cell = row.createCell(0);
cell.setCellValue("Name");
cell = row.createCell(1);
cell.setCellValue("Value1");
cell = row.createCell(2);
cell.setCellValue("Value2");
cell = row.createCell(3);
cell.setCellValue("City");
Random rnd = new Random();
for (int r = 1; r < 10 + rnd.nextInt(100); r++) {
row = sheet.createRow(r);
cell = row.createCell(0);
cell.setCellValue("Name " + ((r-1) % 4 + 1));
cell = row.createCell(1);
cell.setCellValue(r * rnd.nextDouble());
cell = row.createCell(2);
cell.setCellValue(r * rnd.nextDouble());
cell = row.createCell(3);
cell.setCellValue("City " + ((r-1) % 3 + 1));
}
}
public static void main(String[] args) {
try {
XSSFWorkbook wb = new XSSFWorkbook();
XSSFSheet sheet = wb.createSheet();
//create random rows of data
setCellData(sheet);
for (int c = 0; c < 4; c++) sheet.autoSizeColumn(c);
int lastRow = sheet.getLastRowNum();
sheet.setAutoFilter(new CellRangeAddress(0, lastRow, 0, 3));
wb.write(new FileOutputStream("AutoFilterTest.xlsx"));
wb.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
I am having an excel with 2 rows and 5 columns. Now I entered code manually to take values from 1st row. How can I iterate the process?
Below is the code for 1st row in excel. From the 2nd row on, I dont know how to do... I want to iterate one row after another.
Workbook workbook = Workbook.getWorkbook(new File(
"\\C:\\users\\a-4935\\Desktop\\DataPool_CA.xls"));
Sheet sheet = workbook.getSheet("Sheet1");
System.out.println("Reached to Sheet");
Cell a = sheet.getCell(2,1);
Cell b = sheet.getCell(3,1);
Cell c = sheet.getCell(4,1);
Cell d = sheet.getCell(5,1);
Cell e = sheet.getCell(6,1);
Cell f = sheet.getCell(7,1);
Cell g = sheet.getCell(8,1);
Cell h = sheet.getCell(9,1);
Cell i = sheet.getCell(10,1);
String uId = a.getContents();
String deptFromDat = b.getContents();
String deptToDate = c.getContents();
String dept1 = d.getContents();
String arrival1 = e.getContents();
String eihon1 = f.getContents();
String branchCode1 = g.getContents();
String userType1 = h.getContents();
String sessionId1 = i.getContents();
Use the code below to iterate over all rows of a datasheet:
Sheet sheet = workbook.getSheet("Sheet1");
for (Row row : sheet) {
for (Cell cell : row) {
//your logic
}
}
Or, alternatively, use the following code:
Sheet sheet = workbook.getSheet("Sheet1");
for (int i = 0; i < 2; i++) {
Row row = sheet.getRow(i);
if(row == null) {
//do something with an empty row
continue;
}
for (int j = 0; j < 5; j++) {
Cell cell = row.getCell(j);
if(cell == null) {
//do something with an empty cell
continue;
}
//your logic
}
}
for (int i = 0; i <= sheet.getLastRowNum (); ++i) {
row=(Row) sheet.getRow(i);
Iterator<Cell> cells = row.cellIterator();
while (cells.hasNext())
{ .....
you can use the above code to iterate all rows and all cells
You just need to change 1 to the row number, and use a for loop.
Based on your code you could do the following e.g.
For exmaple:
for(int i=0; i<number; i++)
{
Cell a = sheet.getCell(2,i);
Cell b = sheet.getCell(3,i);
Cell c = sheet.getCell(4,i);
...
}
Or better yet move the Cell declarations out of the for loop which is better practice.
Cell a,b, c...;
for(int i=0; i<number; i++)
{
a = sheet.getCell(2,i);
b = sheet.getCell(3,i);
c = sheet.getCell(4,i);
...
}
I want to use poi to set all cells of my excel file to a certain color. however, i keep on getting a nullpointer exception for blank cells. This is what i have so far:
HSSFWorkbook workBook = new HSSFWorkbook();
HSSFCellStyle whiteFG = workBook.createCellStyle();
whiteFG.setFillForegroundColor(HSSFColor.AQUA.index);
whiteFG.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//each row has 20 columns
int numColumns = 20;
for (int colNum = 0 ; colNum < numColumns ; colNum++){
HSSFCell cell = row.getCell((short)colNum);
if (cell != null){
cell.setCellStyle(whiteFG);
}
else if ( "".equals(cell.getStringCellValue()) ){
cell.setCellStyle(whiteFG);
}
else () {
cell.setCellStyle(whiteFG);
}
any advice on how i can color the blank cells?
Your code can not even compile.
But the reason you getting a NullPointerException, is because this code
if (cell != null){
cell.setCellStyle(whiteFG);
}
else if ( "".equals(cell.getStringCellValue()) ){
cell.setCellStyle(whiteFG);
}
All non-null cell will enter the first condition, so the only cell that enter the second condition is null.
*UPDATE : answer the comment *
I assume you want to create a new xls file with colored cell. However, your code miss a point - A new created Workbook dose not contains any sheet/row/cell, you have to create one by yourself.
Here is an example I wrote.
HSSFWorkbook workBook = new HSSFWorkbook();
HSSFCellStyle style = workBook.createCellStyle();
style.setFillForegroundColor(HSSFColor.BROWN.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
HSSFSheet sheet = workBook.createSheet();
int numRow = 20;
int numCol = 20;
for (int rowIndex = 0; rowIndex < numRow; rowIndex++) {
HSSFRow row = sheet.createRow(rowIndex);
for (int colIndex = 0; colIndex < numCol; colIndex++) {
HSSFCell cell = row.createCell(colIndex);
cell.setCellStyle(brownBG);
}
}
FileOutputStream fos = new FileOutputStream("test.xls");
workBook.write(fos);
fos.flush();
fos.close();
System.out.println("done");
The code you wrote use getCell(index) to retrieve cells from a row, this method will only return a null when a you're editing a new xls file.