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This article shows you how to remove digital signatures from a PDF document using Spire.PDF for Java.
import com.spire.pdf.PdfDocument;
import com.spire.pdf.widget.PdfFieldWidget;
import com.spire.pdf.widget.PdfFormWidget;
import com.spire.pdf.widget.PdfSignatureFieldWidget;
public class RemoveSignature {
public static void main(String[] args) {
//Create a PdfDocument object
PdfDocument pdf = new PdfDocument();
//Load the sample PDF document
pdf.loadFromFile("C:\\Users\\Administrator\\Desktop\\Signature.pdf");
//Get form widgets collection from the document
PdfFormWidget widgets = (PdfFormWidget) pdf.getForm();
//Loop through the widgets collection
for (int i = 0; i < widgets.getFieldsWidget().getList().size(); i++)
{
//Get the specific widget
PdfFieldWidget widget = (PdfFieldWidget)widgets.getFieldsWidget().getList().get(i);
//Check if the widget is a PdfSignatureFieldWidget
if (widget instanceof PdfSignatureFieldWidget)
{
//Remove the signature widget
widgets.getFieldsWidget().remove(widget);;
}
}
//Save to file
pdf.saveToFile("RemoveSignature.pdf");
}
}
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Security
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Verify the Restrict Editing Password of a Word Document in Java
2021-05-17 08:34:18 Written by KoohjiThis article demonstrates how to verify if the restrict editing password of a Word document is correct using Spire.Doc for Java.
import com.spire.doc.Document;
public class VerifyRestrictEditingPassword {
public static void main(String[] args) {
//Create a Document instance
Document document = new Document();
//Load a Word document
document.loadFromFile("Input.docx");
//Verify if the password is valid
boolean result = document.checkProtectionPassWord("123");
if(!result) {
System.out.println("Oops! The password is invalid.");
}
else {
System.out.println("Congrats! The password is valid.");
}
}
}
Output:
Published in
Security
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Math equations are mathematical expressions commonly used in physics, engineering, computer science, and economics fields. When creating a professional Word document, you may sometimes need to include math equations to explain complex concepts, solve problems, or support specific arguments. In this article, you will learn how to insert math equations into Word documents 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>14.1.3</version>
</dependency>
</dependencies>
Insert Math Equations into a Word Document in Java
Spire.Doc for Java allows generating math equations from LaTeX code and MathML code using OfficeMath.fromLatexMathCode(String latexMathCode) and OfficeMath.fromMathMLCode(String mathMLCode) methods. The following are the detailed steps.
- Create two string arrays from LaTeX code and MathML code.
- Create a Document instance and add a section to it using Document.addSection() method.
- Iterate through each LaTeX code in the string array.
- Create a math equation from the LaTeX code using OfficeMath.fromLatexMathCode() method.
- Add a paragraph to the section, then add the math equation to the paragraph using Paragraph.getItems().add() method.
- Iterate through each MathML code in the string array.
- Create a math equation from the MathML code using OfficeMath.fromMathMLCode() method.
- Add a paragraph to the section, then add the math equation to the paragraph using Paragraph.getItems().add() method.
- Save the result document using Document.saveToFile() method.
- Java
import com.spire.doc.*;
import com.spire.doc.documents.*;
import com.spire.doc.fields.omath.*;
public class AddMathEquations {
public static void main(String[] args){
//Create a string array from LaTeX code
String[] latexMathCode = {
"x^{2}+\\sqrt{x^{2}+1}=2",
"\\cos (2\\theta) = \\cos^2 \\theta - \\sin^2 \\theta",
"k_{n+1} = n^2 + k_n^2 - k_{n-1}",
"\\frac {\\frac {1}{x}+ \\frac {1}{y}}{y-z}",
"\\int_0^ \\infty \\mathrm {e}^{-x} \\, \\mathrm {d}x",
"\\forall x \\in X, \\quad \\exists y \\leq \\epsilon",
"\\alpha, \\beta, \\gamma, \\Gamma, \\pi, \\Pi, \\phi, \\varphi, \\mu, \\Phi",
"A_{m,n} = \\begin{pmatrix} a_{1,1} & a_{1,2} & \\cdots & a_{1,n} \\\\ a_{2,1} & a_{2,2} & \\cdots & a_{2,n} \\\\ \\vdots & \\vdots & \\ddots & \\vdots \\\\ a_{m,1} & a_{m,2} & \\cdots & a_{m,n} \\end{pmatrix}",
};
//Create a string array from MathML code
String[] mathMLCode = {
"<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>a</mi><mo>≠</mo><mn>0</mn></math>",
"<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>a</mi><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mi>b</mi><mi>x</mi><mo>+</mo><mi>c</mi><mo>=</mo><mn>0</mn></math>",
"<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>x</mi><mo>=</mo><mrow><mfrac><mrow><mo>−</mo><mi>b</mi><mo>±</mo><msqrt><msup><mi>b</mi><mn>2</mn></msup><mo>−</mo><mn>4</mn><mi>a</mi><mi>c</mi></msqrt></mrow><mrow><mn>2</mn><mi>a</mi></mrow></mfrac></mrow></math>",
};
//Create a Document instance
Document doc = new Document();
//Add a section
Section section = doc.addSection();
//Add a paragraph to the section
Paragraph textPara = section.addParagraph();
textPara.appendText("Creating Equations from LaTeX Code");
textPara.applyStyle(BuiltinStyle.Heading_1);
textPara.getFormat().setHorizontalAlignment(HorizontalAlignment.Center);
//Iterate through each LaTeX code in the string array
for (int i = 0; i < latexMathCode.length; i++)
{
//Create a math equation from the LaTeX code
OfficeMath officeMath = new OfficeMath(doc);
officeMath.fromLatexMathCode(latexMathCode[i]);
//Add the math equation to the section
Paragraph paragraph = section.addParagraph();
paragraph.getItems().add(officeMath);
section.addParagraph();
}
//Add a paragraph to the section
textPara = section.addParagraph();
textPara.appendText("Creating Equations from MathML Code");
textPara.applyStyle(BuiltinStyle.Heading_1);
textPara.getFormat().setHorizontalAlignment(HorizontalAlignment.Center);
//Iterate through each MathML code in the string array
for (int j = 0; j < mathMLCode.length; j++)
{
//Create a math equation from the MathML code
OfficeMath officeMath = new OfficeMath(doc);
officeMath.fromMathMLCode(mathMLCode[j]);
//Add the math equation to the section
Paragraph paragraph = section.addParagraph();
paragraph.getItems().add(officeMath);
section.addParagraph();
}
//Save the result document
doc.saveToFile("AddMathEquations.docx", FileFormat.Docx_2016);
doc.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.
Published in
Document Operation
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