Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.mycompany.gannaraputakehomeexam; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.ConditionalFormattingRule; import org.apache.poi.ss.usermodel.DataFormat; import org.apache.poi.ss.usermodel.IndexedColors; import org.apache.poi.ss.usermodel.PatternFormatting; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.SheetConditionalFormatting; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.ss.util.CellRangeAddress; import org.apache.poi.xssf.usermodel.XSSFCellStyle; import org.apache.poi.xssf.usermodel.XSSFFont; import org.apache.poi.xssf.usermodel.XSSFWorkbook; /** * * @author S525717 */ public class WritingToExcel { /* specifying the input file path */ private static final String FILE_PATH = "C:/Gannarapu_Output.xlsx"; /* We are making use of a single instance to prevent multiple write access to same file. */ private static final WritingToExcel INSTANCE = new WritingToExcel(); public static WritingToExcel getInstance() { return INSTANCE; } /** * No ArgsContructor with no body defined */ public WritingToExcel() { } /* create a method to write data to excel file */ public void writeSongsToExcel(List<SongsList> songList) { /* Use XSSF for xlsx format and for xls use HSSF */ Workbook workbook = new XSSFWorkbook(); /* create new sheet */ Sheet songsSheet = workbook.createSheet("Gannarapu_Output"); XSSFCellStyle my_style = (XSSFCellStyle) workbook.createCellStyle(); /* Create XSSFFont object from the workbook */ XSSFFont my_font = (XSSFFont) workbook.createFont(); XSSFFont font = (XSSFFont) workbook.createFont(); /* setting cell color */ CellStyle style = workbook.createCellStyle(); style.setFillForegroundColor(IndexedColors.LIGHT_GREEN.getIndex()); style.setFillPattern(CellStyle.SOLID_FOREGROUND); /* setting Header color */ CellStyle style2 = workbook.createCellStyle(); font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD); style2.setFont(font); style2.setAlignment(CellStyle.ALIGN_CENTER); // style2.setFillForegroundColor(IndexedColors.DARK_RED.getIndex()); // style2.setFillPattern(CellStyle.SOLID_FOREGROUND); // Row rowName = songsSheet.createRow(1); /* Merging the cells */ songsSheet.addMergedRegion(new CellRangeAddress(1, 1, 2, 3)); /* Applying style to attribute name */ int nameCellIndex = 1; Cell namecell = rowName.createCell(nameCellIndex++); namecell.setCellValue("Name"); namecell.setCellStyle(style); Cell cel = rowName.createCell(nameCellIndex++); cel.setCellValue("Gannarapu, Anirudh"); /* Applying underline to Name */ my_font.setUnderline(XSSFFont.U_DOUBLE); my_style.setFont(my_font); /* Attaching the style to the cell */ CellStyle combined = workbook.createCellStyle(); combined.cloneStyleFrom(my_style); combined.cloneStyleFrom(style); cel.setCellStyle(combined); /* Applying colors to header */ Row rowMain = songsSheet.createRow(3); SheetConditionalFormatting sheetCF = songsSheet.getSheetConditionalFormatting(); ConditionalFormattingRule rule1 = sheetCF.createConditionalFormattingRule("5"); PatternFormatting fill1 = rule1.createPatternFormatting(); fill1.setFillBackgroundColor(IndexedColors.RED.index); fill1.setFillPattern(PatternFormatting.SOLID_FOREGROUND); CellRangeAddress[] regions = { CellRangeAddress.valueOf("A4:F4") }; sheetCF.addConditionalFormatting(regions, rule1); /* setting new rule to apply alternate colors to cells having same Genre */ ConditionalFormattingRule rule2 = sheetCF.createConditionalFormattingRule("4"); PatternFormatting fill2 = rule2.createPatternFormatting(); fill2.setFillBackgroundColor(IndexedColors.LEMON_CHIFFON.index); fill2.setFillPattern(PatternFormatting.SOLID_FOREGROUND); CellRangeAddress[] regionsAction = { CellRangeAddress.valueOf("A5:F5"), CellRangeAddress.valueOf("A6:F6"), CellRangeAddress.valueOf("A7:F7"), CellRangeAddress.valueOf("A8:F8"), CellRangeAddress.valueOf("A13:F13"), CellRangeAddress.valueOf("A14:F14"), CellRangeAddress.valueOf("A15:F15"), CellRangeAddress.valueOf("A16:F16"), CellRangeAddress.valueOf("A23:F23"), CellRangeAddress.valueOf("A24:F24"), CellRangeAddress.valueOf("A25:F25"), CellRangeAddress.valueOf("A26:F26") }; /* setting new rule to apply alternate colors to cells having same Genre */ ConditionalFormattingRule rule3 = sheetCF.createConditionalFormattingRule("4"); PatternFormatting fill3 = rule3.createPatternFormatting(); fill3.setFillBackgroundColor(IndexedColors.LIGHT_GREEN.index); fill3.setFillPattern(PatternFormatting.SOLID_FOREGROUND); CellRangeAddress[] regionsAdv = { CellRangeAddress.valueOf("A9:F9"), CellRangeAddress.valueOf("A10:F10"), CellRangeAddress.valueOf("A11:F11"), CellRangeAddress.valueOf("A12:F12"), CellRangeAddress.valueOf("A17:F17"), CellRangeAddress.valueOf("A18:F18"), CellRangeAddress.valueOf("A19:F19"), CellRangeAddress.valueOf("A20:F20"), CellRangeAddress.valueOf("A21:F21"), CellRangeAddress.valueOf("A22:F22"), CellRangeAddress.valueOf("A27:F27"), CellRangeAddress.valueOf("A28:F28"), CellRangeAddress.valueOf("A29:F29") }; /* Applying above created rule formatting to cells */ sheetCF.addConditionalFormatting(regionsAction, rule2); sheetCF.addConditionalFormatting(regionsAdv, rule3); /* Setting coloumn header values */ int mainCellIndex = 0; Cell SNO = rowMain.createCell(mainCellIndex++); SNO.setCellValue("SNO"); SNO.setCellStyle(style2); Cell gen = rowMain.createCell(mainCellIndex++); gen.setCellValue("Genre"); gen.setCellStyle(style2); Cell credit = rowMain.createCell(mainCellIndex++); credit.setCellValue("Credit Score"); credit.setCellStyle(style2); Cell name = rowMain.createCell(mainCellIndex++); name.setCellValue("Album Name"); name.setCellStyle(style2); Cell art = rowMain.createCell(mainCellIndex++); art.setCellValue("Artist"); art.setCellStyle(style2); Cell release = rowMain.createCell(mainCellIndex++); release.setCellValue("Release Date"); release.setCellStyle(style2); /* populating cell values */ int rowIndex = 4; int sno = 1; for (SongsList song : songList) { if (song.getSno() != 0) { Row row = songsSheet.createRow(rowIndex++); int cellIndex = 0; /* first place in row is Sno */ row.createCell(cellIndex++).setCellValue(sno++); /* second place in row is Genre */ row.createCell(cellIndex++).setCellValue(song.getGenre()); /* third place in row is Critic score */ row.createCell(cellIndex++).setCellValue(song.getCriticscore()); /* fourth place in row is Album name */ row.createCell(cellIndex++).setCellValue(song.getAlbumname()); /* fifth place in row is Artist */ row.createCell(cellIndex++).setCellValue(song.getArtist()); /* sixth place in row is marks in date */ if (song.getReleasedate() != null) { Cell date = row.createCell(cellIndex++); DataFormat format = workbook.createDataFormat(); CellStyle dateStyle = workbook.createCellStyle(); dateStyle.setDataFormat(format.getFormat("dd-MMM-yyyy")); date.setCellStyle(dateStyle); date.setCellValue(song.getReleasedate()); /* auto-resizing columns */ songsSheet.autoSizeColumn(6); songsSheet.autoSizeColumn(5); songsSheet.autoSizeColumn(4); songsSheet.autoSizeColumn(3); songsSheet.autoSizeColumn(2); } } } /* writing this workbook to excel file. */ try { FileOutputStream fos = new FileOutputStream(FILE_PATH); workbook.write(fos); fos.close(); System.out.println(FILE_PATH + " is successfully written"); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }