New methods to read the value of a cell. Added methods to convert an Excel file to Json

Author: MBenincasa

README.md

@@ -55,6 +55,8 @@ Java 17 or above.
 - org.projectlombok:lombok:jar:1.18.24
 - commons-beanutils:commons-beanutils:jar:1.9.4
 - com.opencsv:opencsv:jar:5.7.1
+- com.fasterxml.jackson.core:jackson-databind:jar:2.14.2
+- org.apache.logging.log4j:log4j-core:jar:2.20.0
 - org.junit.jupiter:junit-jupiter:jar:5.9.2
 - org.junit.platform:junit-platform-suite-engine:jar:1.9.2
 
@@ -63,7 +65,7 @@ Java 17 or above.
 <dependency>
   <groupId>io.github.mbenincasa</groupId>
   <artifactId>java-excel-utils</artifactId>
-  <version>x.y.z</version>
+  <version>0.3.0</version>
 </dependency>
 ```
 

pom.xml

@@ -133,6 +133,16 @@
             <artifactId>opencsv</artifactId>
             <version>5.7.1</version>
         </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.14.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.20.0</version>
+        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>

src/main/java/io/github/mbenincasa/javaexcelutils/enums/Extension.java

@@ -29,7 +29,12 @@ public enum Extension {
     /**
      * This extension is used for CSV (Comma-separated values) files
      */
-    CSV("csv", "CSV");
+    CSV("csv", "CSV"),
+
+    /**
+     * This extension is used for JSON (JavaScript Object Notation) files
+     */
+    JSON("json", "JSON");
 
     /**
      * The extension's name

src/main/java/io/github/mbenincasa/javaexcelutils/model/excel/ExcelCell.java

@@ -4,10 +4,7 @@
 import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
-import org.apache.poi.ss.usermodel.Cell;
-import org.apache.poi.ss.usermodel.CellStyle;
-import org.apache.poi.ss.usermodel.FormulaEvaluator;
-import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.*;
 
 import java.time.LocalDate;
 import java.time.LocalDateTime;
@@ -42,6 +39,20 @@ public ExcelRow getRow() {
         return new ExcelRow(row, row.getRowNum());
     }
 
+    public Object readValue() throws ReadValueException {
+        Object val;
+        switch (this.cell.getCellType()) {
+            case BOOLEAN -> val = this.cell.getBooleanCellValue();
+            case STRING -> val = this.cell.getStringCellValue();
+            case NUMERIC -> val = this.cell.getNumericCellValue();
+            case FORMULA -> val = this.cell.getCellFormula();
+            case BLANK -> val = "";
+            default -> throw new ReadValueException("An error occurred while reading. CellType '" + this.cell.getCellType() + "'");
+        }
+
+        return val;
+    }
+
     /**
      * Read the value written inside the Cell
      * @param type The class type of the object written to the Cell
@@ -95,6 +106,11 @@ public Object readValue(Class<?> type) throws ReadValueException {
         return val;
     }
 
+    public String readValueAsString() {
+        DataFormatter formatter = new DataFormatter(true);
+        return formatter.formatCellValue(this.cell);
+    }
+
     /**
      * Writes inside the cell
      * @param val The value to write in the Cell

src/main/java/io/github/mbenincasa/javaexcelutils/model/excel/ExcelWorkbook.java

@@ -5,6 +5,7 @@
 import io.github.mbenincasa.javaexcelutils.enums.Extension;
 import io.github.mbenincasa.javaexcelutils.exceptions.ExtensionNotValidException;
 import io.github.mbenincasa.javaexcelutils.exceptions.OpenWorkbookException;
+import io.github.mbenincasa.javaexcelutils.exceptions.SheetAlreadyExistsException;
 import io.github.mbenincasa.javaexcelutils.exceptions.SheetNotFoundException;
 import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;
@@ -207,7 +208,8 @@ public Integer countSheets() {
         return this.workbook.getNumberOfSheets();
     }
 
-    /** The list of Sheets related to the Workbook
+    /**
+     * The list of Sheets related to the Workbook
      * @return A list of Sheets
      */
     public List<ExcelSheet> getSheets() {
@@ -231,10 +233,15 @@ public ExcelSheet createSheet() {
      * Create a new Sheet inside the Workbook
      * @param sheetName The name of the sheet to create
      * @return The newly created Sheet
+     * @throws SheetAlreadyExistsException If you try to insert a Sheet that already exists
      */
-    public ExcelSheet createSheet(String sheetName) {
-        Sheet sheet = this.workbook.createSheet(sheetName);
-        return new ExcelSheet(sheet, this.workbook.getSheetIndex(sheet), sheet.getSheetName());
+    public ExcelSheet createSheet(String sheetName) throws SheetAlreadyExistsException {
+        try {
+            Sheet sheet = this.workbook.createSheet(sheetName);
+            return new ExcelSheet(sheet, this.workbook.getSheetIndex(sheet), sheet.getSheetName());
+        } catch (IllegalArgumentException ex) {
+            throw new SheetAlreadyExistsException(ex.getMessage());
+        }
     }
 
     /**

src/main/java/io/github/mbenincasa/javaexcelutils/samples/convertExcelFileToCsvFile/Main.java

@@ -13,7 +13,7 @@ public static void main(String[] args) {
 
         try {
             System.out.println("Start the conversion...");
-            Map<String, File> fileMap = Converter.excelToCsvFile(excelFile, "./src/main/resources/");
+            Map<String, File> fileMap = Converter.excelToCsvFile(excelFile, "./src/main/resources");
             System.out.println("... completed");
             for (Map.Entry<String, File> entry : fileMap.entrySet()) {
                 System.out.println("The file is ready. Path: " + entry.getValue().getAbsolutePath());

src/main/java/io/github/mbenincasa/javaexcelutils/samples/convertExcelFileToJsonFile/Main.java

@@ -0,0 +1,23 @@
+package io.github.mbenincasa.javaexcelutils.samples.convertExcelFileToJsonFile;
+
+import io.github.mbenincasa.javaexcelutils.tools.Converter;
+
+import java.io.File;
+
+public class Main {
+
+    public static void main(String[] args) {
+
+        File excelFile = new File("./src/main/resources/employee.xlsx");
+
+        try {
+            System.out.println("Start the conversion...");
+            File jsonFile = Converter.excelToJsonFile(excelFile, "./src/main/resources/result");
+            System.out.println("... completed");
+            System.out.println("The file is ready. Path: " + jsonFile.getAbsolutePath());
+        } catch (Exception e) {
+            System.err.println("There was an error. Check the console");
+            throw new RuntimeException(e);
+        }
+    }
+}