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When processing HTML file, you may sometimes find them render differently depending on the browser and screen size. By converting HTML to PDF, you can maintain the layout and formatting of your HTML files, ensuring that the content looks consistent across devices and platforms. In this article, you will learn how to convert a HTML file or a HTML string to PDF in Java using Spire.Doc for Java.
Install Spire.Doc for Java
First of all, you're required to add the Spire.Doc.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.
<repositories>
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.doc</artifactId>
<version>14.4.0</version>
</dependency>
</dependencies>
Convert an HTML File to PDF in Java
You can load an HTML file and then save it as a PDF file using the Document.saveToFile() method. The following are the detailed steps.
- Create a Document object.
- Load an HTML file using Document.loadFromFile() method.
- Convert the HTML file to PDF using Document.saveToFile(String fileName, FileFormat.PDF) method.
- Java
import com.spire.doc.*;
import com.spire.doc.documents.XHTMLValidationType;
public class htmlFileToPdf {
public static void main(String[] args) {
// Create a Document object
Document document = new Document();
// Load an HTML file into the document object
document.loadFromFile("sample1.html", FileFormat.Html, XHTMLValidationType.None);
// Save the HTML file to a PDF file
document.saveToFile("htmlFileToPdf.pdf", FileFormat.PDF);
document.dispose();
}
}
Convert an HTML String to PDF in Java
To convert an HTML string to PDF, you first need to add the HTML string to a paragraph in Word through the Paragraph.appendHTML() method, and then save the it as a PDF file. The following are the detailed steps.
- Create a Document object.
- Add a section using Document.addSection() method.
- Add a paragraph using Section.addParagraph() method.
- Specify the HTML string, and then add the HTML string to the paragraph using Paragraph.appendHTML() method.
- Save the document as a PDF file using Document.saveToFile(String fileName, FileFormat.PDF) method.
- Java
import com.spire.doc.*;
import com.spire.doc.documents.Paragraph;
import java.io.*;
public class htmlStringToPdf {
public static void main(String[] args) throws IOException {
// Create a Document object
Document document = new Document();
// Add a section to the document
Section sec = document.addSection();
// Add a paragraph to the section
Paragraph paragraph = sec.addParagraph();
// Specify the HTML string
String htmlString = "<html><head><title>HTML to Word Example</title><style>, body {font-family: 'Calibri';}, h1 {color: #FF5733; font-size: 24px; margin-bottom: 20px;}, " +
"p {color: #333333; font-size: 16px; margin-bottom: 10px;} ul {list-style-type: disc; margin-left: 20px; margin-bottom: 15px;}, " +
"li {font-size: 14px; margin-bottom: 5px;}, table {border-collapse: collapse; width: 100%; margin-bottom: 20px;}" +
"th, td {border: 1px solid #CCCCCC; padding: 8px; text-align: left;}, th {background-color: #F2F2F2; font-weight: bold;}, td {color: #0000FF;}</style></head>" +
"<body><h1>This is a Heading</h1><p>This is a paragraph demonstrating the conversion of HTML to Word document.</p>" +
"<p>Here's an example of an unordered list:</p><ul><li>Item 1</li><li>Item 2</li><li>Item 3</li></ul> " +
"<p>Here's a table:</p><table><tr><th>Product</th><th>Quantity</th><th>Price</th></tr><tr><td>Jacket</td>" +
"<td>30</td><td>$150</td></tr><tr><td>Sweater</td><td>25</td><td>$99</td></tr></table></body></html>";
// Append the HTML string to the paragraph
paragraph.appendHTML(htmlString);
// Save the HTML string to a pdf file
document.saveToFile("htmlStringToPDF.pdf", FileFormat.PDF);
document.dispose();
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
This article demonstrates how to set dpi on x and y axis when converting an Excel worksheet to an image using Spire.XLS for Java.
import com.spire.xls.*;
public class ConvertExcelToImage {
public static void main(String[] args) {
//Create a Workbook object
Workbook wb = new Workbook();
//Load an Excel file
wb.loadFromFile("C:\\Users\\Administrator\\Desktop\\data.xlsx");
//Set dpi on x and y axis
wb.getConverterSetting().setXDpi(300);
wb.getConverterSetting().setYDpi(300);
//Declare a Worksheet variable
Worksheet sheet;
//Loop through the worksheets
for (int i = 0; i < wb.getWorksheets().size(); i++) {
//Get the specific worksheet
sheet = wb.getWorksheets().get(i);
//Convert worksheet to image
sheet.saveToImage("C:\\Users\\Administrator\\Desktop\\Output\\image-" + i + ".png");
}
}
}
This article demonstrates how to ungroup grouped shapes in a PowerPoint document using Spire.Presentation for .NET.
The input PowerPoint document:
using Spire.Presentation;
namespace UngroupShapes
{
class Program
{
static void Main(string[] args)
{
//Create a Presentation instance
Presentation ppt = new Presentation();
//Load the PowerPoint document
ppt.LoadFromFile("Sample.pptx");
//Get the first slide
ISlide slide = ppt.Slides[0];
//Loop through the shapes in the slide
for(int i = 0; i< slide.Shapes.Count;i++)
{
IShape shape = slide.Shapes[i];
//Detect if the shape is a grouped shape
if (shape is GroupShape)
{
GroupShape groupShape = shape as GroupShape;
//Ungroup the grouped shape
slide.Ungroup(groupShape);
}
}
//Save the resultant document
ppt.SaveToFile("UngroupShapes.pptx", FileFormat.Pptx2013);
}
}
}
Imports Spire.Presentation
Namespace UngroupShapes
Class Program
Private Shared Sub Main(ByVal args As String())
Dim ppt As Presentation = New Presentation()
ppt.LoadFromFile("Sample.pptx")
Dim slide As ISlide = ppt.Slides(0)
For i As Integer = 0 To slide.Shapes.Count - 1
Dim shape As IShape = slide.Shapes(i)
If TypeOf shape Is GroupShape Then
Dim groupShape As GroupShape = TryCast(shape, GroupShape)
slide.Ungroup(groupShape)
End If
Next
ppt.SaveToFile("UngroupShapes.pptx", FileFormat.Pptx2013)
End Sub
End Class
End Namespace
The output PowerPoint document after ungrouping shapes:
