J2HEE is a free open-source library for exporting HTML tables to Excel in most common formats:

• HTTP Requests URLs with HTML table
• HTML to Excel transformation
  • Including merge cells
• Simple Excel formatting

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
        <version>3.9</version>
    </dependency>
	<!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
	<dependency>
		<groupId>org.jsoup</groupId>
		<artifactId>jsoup</artifactId>
		<version>1.16.2</version>
	</dependency>
</dependencies>

HttpHelper Process a provided URL and clean the HTML tables, to return a ready-to-use String with the TableHtml

TableHtml Handle the transformation of the HTML table, and provide method to access the table rows and columns. It is used to fetch the WorkbookManager.

As an input, it is possible to use 2 type of streams:

• The raw HTML table stream (as an String). You can use the FileHelper object as an easy-to-use interface to read and format .html files.
• The HttpHelper object, used to request and process the HTTP response.

WorkbookManager Receives an TableHtml and provides methods to return an Excel files.

TableHtml table = new TableHtml( FileHelper.readExcelFileFromLocal("/kpi1.html"), false, true);

WorkbookManager wb = new WorkbookManager(table, "Test");
// Save the Excel to a .xls file
wb.saveWorkbookToLocal(path, "kpi1");

// Return the excel file as a Workbook
HSSFWorkbook hssfWorkbook = wb.getWb();

// Return the excel file as a Byte[]
byte[] byteArray = wb.getWbAsByteArray();