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PDF annotations are notes or markers added to documents, which are great for making comments, giving explanations, giving feedback, etc. Co-creators of documents often communicate with annotations. However, when the issues associated with the annotations have been dealt with or the document has been finalized, it is necessary to remove the annotations to make the document more concise and professional. This article shows how to delete PDF annotations programmatically using Spire.PDF for Java.
- Remove the Specified Annotation
- Remove All Annotations from a Page
- Remove All Annotations from a PDF Document
Install Spire.PDF for Java
First of all, you're required to add the Spire.Pdf.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.pdf</artifactId>
<version>11.11.11</version>
</dependency>
</dependencies>
Remove the Specified Annotation
Annotations are page-level document elements. Therefore, deleting an annotation requires getting the page where the annotation is located first, and then you can use the PdfPageBase.getAnnotationsWidget().removeAt() method to delete the annotation. The detailed steps are as follows.
- Create a PdfDocument instance.
- Load a PDF document using PdfDocument.loadFromFile() method.
- Get the first page using PdfDocument.getPages().get() method.
- Remove the first annotation from this page using PdfPageBase.getAnnotationsWidget().removeAt() method.
- Save the document using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
public class RemoveAnnotation {
public static void main(String[] args) {
//Create an object of PdfDocument
PdfDocument pdf = new PdfDocument();
//Load a PDF document
pdf.loadFromFile("C:/Annotations.pdf");
//Get the first page
PdfPageBase page = pdf.getPages().get(0);
//Remove the first annotation
page.getAnnotationsWidget().removeAt(0);
//Save the document
pdf.saveToFile("RemoveOneAnnotation.pdf");
}
}
Remove All Annotations from a Page
Spire.PDF for Java also provides PdfPageBase.getAnnotationsWidget().clear() method to remove all annotations in the specified page. The detailed steps are as follows.
- Create a PdfDocument instance.
- Load a PDF document using PdfDocument.loadFromFile() method.
- Get the first page using PdfDocument.getPages().get() method.
- Remove all annotations from the page using PdfPageBase.getAnnotationsWidget().clear() method.
- Save the document using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
public class RemoveAllAnnotationPage {
public static void main(String[] args) {
//Create an object of PdfDocument
PdfDocument pdf = new PdfDocument();
//Load a PDF document
pdf.loadFromFile("C:/Annotations.pdf");
//Get the first page
PdfPageBase page = pdf.getPages().get(0);
//Remove all annotations in the page
page.getAnnotationsWidget().clear();
//Save the document
pdf.saveToFile("RemoveAnnotationsPage.pdf");
}
}
Remove All Annotations from a PDF Document
To remove all annotations from a PDF document, we need to loop through all pages in the document and delete all annotations from each page. The detailed steps are as follows.
- Create a PdfDocument instance.
- Load a PDF document using PdfDocument.loadFromFile() method.
- Loop through all pages to delete annotations.
- Delete annotations in each page using PdfPageBase.getAnnotationsWidget().clear() method.
- Save the document using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
public class RemoveAllAnnotations {
public static void main(String[] args) {
//Create an object of PdfDocument
PdfDocument pdf = new PdfDocument();
//Load a PDF document
pdf.loadFromFile("C:/Users/Sirion/Desktop/Annotations.pdf");
//Loop through the pages in the document
for (PdfPageBase page : (Iterable) pdf.getPages()) {
//Remove annotations in each page
page.getAnnotationsWidget().clear();
}
//Save the document
pdf.saveToFile("RemoveAllAnnotations.pdf");
}
}
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We have demonstrated how to insert text and image to textbox in a Word document by using Spire.Doc for Java. This article will demonstrate how to insert table to textbox in Word.
import com.spire.doc.*;
import com.spire.doc.documents.*;
import com.spire.doc.fields.*;
import java.awt.*;
public class insertTableIntoTextBox {
public static void main(String[] args) throws Exception{
//Create a new document; add a section and paragraph
Document doc = new Document();
Section section = doc.addSection();
Paragraph paragraph = section.addParagraph();
//Add a textbox to the paragraph
TextBox textbox = paragraph.appendTextBox(380, 100);
//Set the position of the textbox
textbox.getFormat().setHorizontalOrigin(HorizontalOrigin.Page);
textbox.getFormat().setHorizontalPosition(140);
textbox.getFormat().setVerticalOrigin(VerticalOrigin.Page);
textbox.getFormat().setVerticalPosition(50);
//Insert table to the textbox
Table table = textbox.getBody().addTable(true);
//Specify the number of rows and columns of the table
table.resetCells(4, 4);
//Define the data
String[][] data = new String[][]
{
{"Name", "Age", "Gender", "ID"},
{"John", "28", "Male", "0023"},
{"Steve", "30", "Male", "0024"},
{"Lucy", "26", "female", "0025"}
};
//Add data to the table
for (int i = 0; i < 4; i++) {
TableRow dataRow = table.getRows().get(i);
dataRow.getCells().get(i).setCellWidth(70,CellWidthType.Point);
dataRow.setHeight(22);
dataRow.setHeightType(TableRowHeightType.Exactly);
for (int j = 0; j < 4; j++) {
TextRange tableRange = table.getRows().get(i).getCells().get(j).addParagraph().appendText(data[i][j]);
tableRange.getCharacterFormat().setFontName("Arial");
tableRange.getCharacterFormat().setFontSize(11f);
tableRange.getOwnerParagraph().getFormat().setHorizontalAlignment(HorizontalAlignment.Center);
tableRange.getCharacterFormat().setBold(true);
}
}
//Set the background color for the first row
TableRow row = table.getRows().get(0);
for (int z = 0; z < row.getCells().getCount(); z++) {
row.getCells().get(z).getCellFormat().getShading().setBackgroundPatternColor(new Color(176,224,238));
}
//Apply style to the table
table.applyStyle(DefaultTableStyle.Table_Grid_5);
//Save the document
String output = "output/insertTableIntoTextBox1.docx";
doc.saveToFile(output, FileFormat.Docx_2013);
}
}
The effective screenshot after insert table to Textbox in Word:
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This article demonstrates how to add line numbers before chunks of text in a PDF page by using Spire.PDF for .NET.
Below is a screenshot of the input document.
C#
using Spire.Pdf;
using Spire.Pdf.General.Find;
using Spire.Pdf.Graphics;
using System.Drawing;
namespace AddLineNumber
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument of instance
PdfDocument doc = new PdfDocument();
//Load a PDF document
doc.LoadFromFile(@"G:\360MoveData\Users\Administrator\Desktop\sample.pdf");
//Get the first page
PdfPageBase page = doc.Pages[0];
//Find the spcific text in the fisrt line
PdfTextFind topLine = page.FindText("C# (pronounced See Sharp)", TextFindParameter.None).Finds[0];
//Get the line height
float lineHeight = topLine.Bounds.Height;
//Get the Y coordinate of the selected text
float y = topLine.Bounds.Y;
//Find the spcific text in the second line
PdfTextFind secondLine = page.FindText("language. C#", TextFindParameter.None).Finds[0];
//Calculate the line spacing
float lineSpacing = secondLine.Bounds.Top - topLine.Bounds.Bottom;
//Find the specific text in the last line
PdfTextFind bottomLine = page.FindText("allocation of objects", TextFindParameter.None).Finds[0];
//Get the height of the chunks
float height = bottomLine.Bounds.Bottom;
//Create a font
PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 11f);
int i = 1;
while (y < height)
{
//Draw line number before a specific line of text
page.Canvas.DrawString(i.ToString(), font, PdfBrushes.Black, new PointF(15, y));
y += lineHeight + lineSpacing;
i++;
}
//Save the document
doc.SaveToFile("result.pdf");
}
}
}
VB.NET
Imports Spire.Pdf
Imports Spire.Pdf.General.Find
Imports Spire.Pdf.Graphics
Imports System.Drawing
Namespace AddLineNumber
Class Program
Shared Sub Main(ByVal args() As String)
'Create a PdfDocument of instance
Dim doc As PdfDocument = New PdfDocument()
'Load a PDF document
doc.LoadFromFile("G:\360MoveData\Users\Administrator\Desktop\sample.pdf")
'Get the first page
Dim page As PdfPageBase = doc.Pages(0)
'Find the spcific text in the fisrt line
Dim topLine As PdfTextFind = page.FindText("C# (pronounced See Sharp)",TextFindParameter.None).Finds(0)
'Get the line height
Dim lineHeight As single = topLine.Bounds.Height
'Get the Y coordinate of the selected text
Dim y As single = topLine.Bounds.Y
'Find the spcific text in the second line
Dim secondLine As PdfTextFind = page.FindText("language. C#",TextFindParameter.None).Finds(0)
'Calculate the line spacing
Dim lineSpacing As single = secondLine.Bounds.Top - topLine.Bounds.Bottom
'Find the specific text in the last line
Dim bottomLine As PdfTextFind = page.FindText("allocation of objects",TextFindParameter.None).Finds(0)
'Get the height of the chunks
Dim height As single = bottomLine.Bounds.Bottom
'Create a font
Dim font As PdfFont = New PdfFont(PdfFontFamily.TimesRoman,11f)
Dim i As Integer = 1
While y < height
'Draw line number before a specific line of text
page.Canvas.DrawString(i.ToString(),font,PdfBrushes.Black,New PointF(15,y))
y += lineHeight + lineSpacing
i = i + 1
End While
'Save the document
doc.SaveToFile("result.pdf")
End Sub
End Class
End Namespace
Output
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