New methods to convert one of the POJOs to Excel. Streams are used instead of Collections data structures and not only a File is returned, but also an OutputStream or a byte array

Author: MBenincasa

src/main/java/io/github/mbenincasa/javaexcelutils/model/converter/ObjectToExcel.java

@@ -0,0 +1,17 @@
+package io.github.mbenincasa.javaexcelutils.model.converter;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.stream.Stream;
+
+@AllArgsConstructor
+@Getter
+@Setter
+public class ObjectToExcel<T> {
+
+    private String sheetName;
+    private Class<T> clazz;
+    private Stream<T> stream;
+}

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

@@ -1,4 +1,4 @@
-package io.github.mbenincasa.javaexcelutils.model;
+package io.github.mbenincasa.javaexcelutils.model.excel;
 
 import io.github.mbenincasa.javaexcelutils.exceptions.ReadValueException;
 import lombok.AllArgsConstructor;

src/main/java/io/github/mbenincasa/javaexcelutils/model/ExcelRow.java renamed to src/main/java/io/github/mbenincasa/javaexcelutils/model/excel/ExcelRow.java

@@ -1,4 +1,4 @@
-package io.github.mbenincasa.javaexcelutils.model;
+package io.github.mbenincasa.javaexcelutils.model.excel;
 
 import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;

src/main/java/io/github/mbenincasa/javaexcelutils/model/ExcelSheet.java renamed to src/main/java/io/github/mbenincasa/javaexcelutils/model/excel/ExcelSheet.java

@@ -1,4 +1,4 @@
-package io.github.mbenincasa.javaexcelutils.model;
+package io.github.mbenincasa.javaexcelutils.model.excel;
 
 import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;

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

@@ -1,4 +1,4 @@
-package io.github.mbenincasa.javaexcelutils.model;
+package io.github.mbenincasa.javaexcelutils.model.excel;
 
 import com.opencsv.CSVReader;
 import com.opencsv.CSVWriter;

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

@@ -1,15 +1,14 @@
 package io.github.mbenincasa.javaexcelutils.samples.convertObjectsToExcelFileSample;
 
 import io.github.mbenincasa.javaexcelutils.enums.Extension;
+import io.github.mbenincasa.javaexcelutils.model.converter.ObjectToExcel;
 import io.github.mbenincasa.javaexcelutils.tools.Converter;
 
 import java.io.File;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.*;
+import java.util.stream.Stream;
 
 public class Main {
 
@@ -24,11 +23,15 @@ public static void main(String[] args) {
         offices.add(new Office("Pero", "Milano", 73));
 
         try {
-            System.out.println("Start the conversion...");
-            File report = Converter.objectsToExcel(employees, Employee.class, "./src/main/resources/", "employee", Extension.XLSX, true);
-            System.out.println("First conversion completed...");
-            Converter.objectsToExistingExcel(report, offices, Office.class, true);
-            System.out.println("The file is ready. Path: " + report.getAbsolutePath());
+            Stream<Employee> employeeStream = employees.stream();
+            Stream<Office> officeStream = offices.stream();
+            List<ObjectToExcel<?>> list = new ArrayList<>();
+            list.add(new ObjectToExcel<>("Employee", Employee.class, employeeStream));
+            list.add(new ObjectToExcel<>("Office", Office.class, officeStream));
+            System.out.println("Converting...");
+            File fileOutput = Converter.objectsToExcelFile(list, Extension.XLSX, "./src/main/resources/result", true);
+            System.out.println("...completed");
+            System.out.println("File output: " + fileOutput.getAbsolutePath());
         } catch (Exception e) {
             System.err.println("There was an error. Check the console");
             throw new RuntimeException(e);

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

@@ -1,7 +1,7 @@
 package io.github.mbenincasa.javaexcelutils.samples.countAllRowsSample;
 
-import io.github.mbenincasa.javaexcelutils.model.ExcelSheet;
-import io.github.mbenincasa.javaexcelutils.model.ExcelWorkbook;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelSheet;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelWorkbook;
 
 import java.io.File;
 import java.util.LinkedList;

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

@@ -1,7 +1,7 @@
 package io.github.mbenincasa.javaexcelutils.samples.sheetSample;
 
-import io.github.mbenincasa.javaexcelutils.model.ExcelSheet;
-import io.github.mbenincasa.javaexcelutils.model.ExcelWorkbook;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelSheet;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelWorkbook;
 
 import java.io.File;
 import java.util.List;

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

@@ -1,9 +1,9 @@
 package io.github.mbenincasa.javaexcelutils.samples.writeExcelSample;
 
-import io.github.mbenincasa.javaexcelutils.model.ExcelCell;
-import io.github.mbenincasa.javaexcelutils.model.ExcelRow;
-import io.github.mbenincasa.javaexcelutils.model.ExcelSheet;
-import io.github.mbenincasa.javaexcelutils.model.ExcelWorkbook;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelCell;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelRow;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelSheet;
+import io.github.mbenincasa.javaexcelutils.model.excel.ExcelWorkbook;
 import org.apache.commons.io.FilenameUtils;
 
 import java.io.File;