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Rajeev Kumar Singh
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Diff for: ‎.gitignore

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.DS_Store
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.idea
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*.class
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target
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*.iml

Diff for: ‎poi-generated-file.xlsx

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Diff for: ‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.callicoder</groupId>
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<artifactId>excel-utils</artifactId>
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<version>1.0-SNAPSHOT</version>
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<dependencies>
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<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi</artifactId>
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<version>3.17</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml</artifactId>
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<version>3.17</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

Diff for: ‎sample-xls-file.xls

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Diff for: ‎sample-xlsx-file.xlsx

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Diff for: ‎src/main/java/ExcelReader.java

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import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
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import org.apache.poi.ss.usermodel.*;
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import java.io.File;
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import java.io.IOException;
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import java.util.Iterator;
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/**
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* Created by rajeevkumarsingh on 18/12/17.
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*/
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public class ExcelReader {
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public static final String SAMPLE_XLS_FILE_PATH = "./sample-xls-file.xls";
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public static final String SAMPLE_XLSX_FILE_PATH = "sample-xlsx-file.xlsx";
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public static void main(String[] args) throws IOException, InvalidFormatException {
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// Creating a Workbook from an Excel file (.xls or .xlsx)
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Workbook workbook = WorkbookFactory.create(new File(SAMPLE_XLSX_FILE_PATH));
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// Retrieving the number of sheets in the Workbook
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System.out.println("Workbook has " + workbook.getNumberOfSheets() + " Sheets : ");
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/*
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=============================================================
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Iterating over all the sheets in the workbook (Multiple ways)
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=============================================================
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*/
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// 1. You can obtain a sheetIterator and iterate over it
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Iterator<Sheet> sheetIterator = workbook.sheetIterator();
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System.out.println("Retrieving Sheets using Iterator");
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while (sheetIterator.hasNext()) {
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Sheet sheet = sheetIterator.next();
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System.out.println("=> " + sheet.getSheetName());
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}
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// 2. Or you can use a for-each loop
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System.out.println("Retrieving Sheets using for-each loop");
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for(Sheet sheet: workbook) {
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System.out.println("=> " + sheet.getSheetName());
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}
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// 3. Or you can use a Java 8 forEach wih lambda
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System.out.println("Retrieving Sheets using Java 8 forEach with lambda");
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workbook.forEach(sheet -> {
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System.out.println("=> " + sheet.getSheetName());
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});
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/*
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==================================================================
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Iterating over all the rows and columns in a Sheet (Multiple ways)
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==================================================================
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*/
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// Getting the Sheet at index zero
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Sheet sheet = workbook.getSheetAt(0);
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// Create a DataFormatter to format and get each cell's value as String
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DataFormatter dataFormatter = new DataFormatter();
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// 1. You can obtain a rowIterator and columnIterator and iterate over them
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System.out.println("\n\nIterating over Rows and Columns using Iterator\n");
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Iterator<Row> rowIterator = sheet.rowIterator();
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while (rowIterator.hasNext()) {
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Row row = rowIterator.next();
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// Now let's iterate over the columns of the current row
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Iterator<Cell> cellIterator = row.cellIterator();
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while (cellIterator.hasNext()) {
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Cell cell = cellIterator.next();
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String cellValue = dataFormatter.formatCellValue(cell);
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System.out.print(cellValue + "\t");
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}
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System.out.println();
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}
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// 2. Or you can use a for-each loop to iterate over the rows and columns
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System.out.println("\n\nIterating over Rows and Columns using for-each loop\n");
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for (Row row: sheet) {
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for(Cell cell: row) {
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String cellValue = dataFormatter.formatCellValue(cell);
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System.out.print(cellValue + "\t");
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}
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System.out.println();
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}
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// 3. Or you can use Java 8 forEach loop with lambda
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System.out.println("\n\nIterating over Rows and Columns using Java 8 forEach with lambda\n");
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sheet.forEach(row -> {
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row.forEach(cell -> {
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printCellValue(cell);
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});
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System.out.println();
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});
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// Closing the workbook
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workbook.close();
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}
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private static void printCellValue(Cell cell) {
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switch (cell.getCellTypeEnum()) {
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case BOOLEAN:
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System.out.print(cell.getBooleanCellValue());
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break;
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case STRING:
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System.out.print(cell.getRichStringCellValue().getString());
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break;
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case NUMERIC:
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if (DateUtil.isCellDateFormatted(cell)) {
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System.out.print(cell.getDateCellValue());
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} else {
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System.out.print(cell.getNumericCellValue());
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}
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break;
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case FORMULA:
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System.out.print(cell.getCellFormula());
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break;
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case BLANK:
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System.out.print("");
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break;
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default:
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System.out.print("");
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}
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System.out.print("\t");
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}
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}

Diff for: ‎src/main/java/ExcelWriter.java

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import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
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import org.apache.poi.ss.usermodel.*;
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import org.apache.poi.xssf.usermodel.XSSFWorkbook;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.List;
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/**
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* Created by rajeevkumarsingh on 22/12/17.
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*/
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public class ExcelWriter {
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private static String[] columns = {"Name", "Email", "Date Of Birth", "Salary"};
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private static List<Employee> employees = new ArrayList<>();
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static {
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Calendar dateOfBirth = Calendar.getInstance();
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dateOfBirth.set(1992, 7, 21);
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employees.add(new Employee("Rajeev Singh", "[email protected]",
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dateOfBirth.getTime(), 1200000.0));
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dateOfBirth.set(1965, 10, 15);
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employees.add(new Employee("Thomas cook", "[email protected]",
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dateOfBirth.getTime(), 1500000.0));
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dateOfBirth.set(1987, 4, 18);
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employees.add(new Employee("Steve Maiden", "[email protected]",
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dateOfBirth.getTime(), 1800000.0));
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}
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public static void main(String[] args) throws IOException, InvalidFormatException {
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// Create a Workbook
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Workbook workbook = new XSSFWorkbook();
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CreationHelper createHelper = workbook.getCreationHelper();
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// Create a Sheet
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Sheet sheet = workbook.createSheet("Employee");
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// Create a Font for styling header cells
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Font headerFont = workbook.createFont();
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headerFont.setBold(true);
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headerFont.setFontHeight((short) 16);
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headerFont.setColor(IndexedColors.RED.getIndex());
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// Create a CellStyle with the font
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CellStyle headerCellStyle = workbook.createCellStyle();
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headerCellStyle.setFont(headerFont);
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// Create a Row
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Row headerRow = sheet.createRow(0);
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// Creating cells
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for(int i = 0; i < columns.length; i++) {
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Cell cell = headerRow.createCell(i);
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cell.setCellValue(columns[i]);
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cell.setCellStyle(headerCellStyle);
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}
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// Cell Style for formatting Date
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CellStyle dateCellStyle = workbook.createCellStyle();
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dateCellStyle.setDataFormat(createHelper.createDataFormat().getFormat("dd-MM-yyyy"));
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// Create Other rows and cells with employees data
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int rowNum = 1;
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for(Employee employee: employees) {
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Row row = sheet.createRow(rowNum++);
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row.createCell(0)
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.setCellValue(employee.getName());
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row.createCell(1)
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.setCellValue(employee.getEmail());
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Cell dobCell = row.createCell(2);
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dobCell.setCellValue(employee.getDateOfBirth());
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dobCell.setCellStyle(dateCellStyle);
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row.createCell(3)
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.setCellValue(employee.getSalary());
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}
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for(int i = 0; i < columns.length; i++) {
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sheet.autoSizeColumn(i);
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}
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// Write the output to a file
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FileOutputStream fileOut = new FileOutputStream("poi-generated-file.xlsx");
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workbook.write(fileOut);
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fileOut.close();
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}
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}
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class Employee {
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private String name;
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private String email;
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private Date dateOfBirth;
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private double salary;
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public Employee(String name, String email, Date dateOfBirth, double salary) {
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this.name = name;
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this.email = email;
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this.dateOfBirth = dateOfBirth;
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this.salary = salary;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getEmail() {
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return email;
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}
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public void setEmail(String email) {
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this.email = email;
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}
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public Date getDateOfBirth() {
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return dateOfBirth;
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}
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public void setDateOfBirth(Date dateOfBirth) {
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this.dateOfBirth = dateOfBirth;
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}
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public double getSalary() {
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return salary;
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}
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public void setSalary(double salary) {
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this.salary = salary;
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}
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}

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