Java (482)
A digital signature is a specific type of signature that is backed by a digital certificate, providing proof of your identity. Digital signatures are used to protect documents in a wide range of fields such as life insurance, invoices, rental agreements, and employment contracts and so on. This article will show you how to digitally sign a Word document in Java using Spire.Doc for Java.
Install Spire.Doc for Java
First, 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>
Add a Digital Signature to a Word Document in Java
The follows are the steps to digitally sign a Word document using Spire.Doc for Java.
- Create a Document object.
- Load a Word document using Document.loadFromFile() method.
- Specify the path and the password of a PFX certificate.
- Digitally sign the document while saving the document using Document.saveToFile(string fileName, FileFormat fileFormat, string certificatePath, string securePassword) method. There are some other methods that you can use to digitally sign a Word document.
- public void saveToFile(string fileName, FileFormat fileFormat, byte[] certificateData, string securePassword);
- public void saveToStream(Stream stream, FileFormat fileFormat, byte[] certificateData, string securePassword);
- public void saveToStream(Stream stream, FileFormat fileFormat, string certificatePath, string securePassword);
- public static byte[] Document.sign(Stream sourceStream, byte[] certificateData, string securePassword);
- public static byte[] Document.sign(Stream sourceStream, string certificatePath, string securePassword);
- Java
import com.spire.doc.Document;
import com.spire.doc.FileFormat;
public class DigitallySignWordDocument {
public static void main(String[] args) {
//Create a Document object
Document doc = new Document();
//Load a Word file
doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\sample.docx");
//Specify the certificate path
String certificatePath = "C:\\Users\\Administrator\\Desktop\\certificate.pfx";
//Specify the password of the certificate
String password = "e-iceblue";
//Digitally sign the document while saving it to a .docx file
doc.saveToFile("AddDigitalSignature.docx", FileFormat.Docx_2013, certificatePath, password);
}
}
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
Security
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This article demonstrates how to create multi-level category chart in Excel using Spire.XLS for Java.
import com.spire.xls.*;
import com.spire.xls.charts.*;
public class CreateMultiLevelChart {
public static void main(String []args) throws Exception {
//create a workbook
Workbook workbook = new Workbook();
Worksheet sheet = workbook.getWorksheets().get(0);
//write data to cells
sheet.getCellRange("A1").setText( "Main Category");
sheet.getCellRange("A2").setText("Fruit");
sheet.getCellRange("A6").setText("Vegies");
sheet.getCellRange("B1").setText("Sub Category");
sheet.getCellRange("B2").setText( "Bananas");
sheet.getCellRange("B3").setText( "Oranges");
sheet.getCellRange("B4").setText( "Pears");
sheet.getCellRange("B5").setText("Grapes");
sheet.getCellRange("B6").setText( "Carrots");
sheet.getCellRange("B7").setText( "Potatoes");
sheet.getCellRange("B8").setText( "Celery");
sheet.getCellRange("B9").setText( "Onions");
sheet.getCellRange("C1").setText("Value");
sheet.getCellRange("C2").setValue("52");
sheet.getCellRange("C3").setValue( "65");
sheet.getCellRange("C4").setValue( "50");
sheet.getCellRange("C5").setValue( "45");
sheet.getCellRange("C6").setValue( "64");
sheet.getCellRange("C7").setValue( "62");
sheet.getCellRange("C8").setValue( "89");
sheet.getCellRange("C9").setValue( "57");
//vertically merge cells from A2 to A5, A6 to A9
sheet.getCellRange("A2:A5").merge();
sheet.getCellRange("A6:A9").merge();
sheet.autoFitColumn(1);
sheet.autoFitColumn(2);
//add a clustered bar chart to worksheet
Chart chart = sheet.getCharts().add(ExcelChartType.BarClustered);
chart.setChartTitle( "Value");
chart.getPlotArea().getFill().setFillType( ShapeFillType.NoFill);
chart.getLegend().delete();
chart.setLeftColumn(5);
chart.setTopRow(1);
chart.setRightColumn(14);
//set the data source of series data
chart.setDataRange(sheet.getCellRange("C2:C9"));
chart.setSeriesDataFromRange(false);
//set the data source of category labels
ChartSerie serie = chart.getSeries().get(0);
serie.setCategoryLabels( sheet.getCellRange("A2:B9"));
//show multi-level category labels
chart.getPrimaryCategoryAxis().setMultiLevelLable( true);
//save the document
workbook.saveToFile("output/createMultiLevelChart.xlsx", ExcelVersion.Version2013);
}
}
Output:
Published in
Chart
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We have demonstrated how to use Spire.PDF for java to convert PDF to image. This article will show you how to convert image to PDF in Java applications.
import com.spire.pdf.*;
import com.spire.pdf.graphics.PdfImage;
public class imageToPDF {
public static void main(String[] args) throws Exception {
//Create a PDF document
PdfDocument pdf = new PdfDocument();
//Add a new page
PdfPageBase page = pdf.getPages().add();
//Load the image
PdfImage image = PdfImage.fromFile("logo.jpg");
double widthFitRate = image.getPhysicalDimension().getWidth() / page.getCanvas().getClientSize().getWidth();
double heightFitRate = image.getPhysicalDimension().getHeight() / page.getCanvas().getClientSize().getHeight();
double fitRate = Math.max(widthFitRate, heightFitRate);
//get the picture width and height
double fitWidth = image.getPhysicalDimension().getWidth() / fitRate;
double fitHeight = image.getPhysicalDimension().getHeight() / fitRate;
//Draw image
page.getCanvas().drawImage(image, 0, 30, fitWidth, fitHeight);
// Save document to file
pdf.saveToFile("output/ToPDF.pdf");
pdf.close();
}
}
Output：
Published in
Conversion
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