Java에서 PDF 파일을 회전하는 방법

Prerequisites

To create a PDF application that can rotate pages, you will need the following prerequisites downloaded and installed on your computer:

1. JDK (Java Development Kit): Install the latest version of JDK on your computer to compile and run the PDF rotation application. The JDK can be downloaded from the official website.
2. Maven: Maven needs to be installed as it is a build automation tool used primarily for Java projects. Maven can be downloaded from the Apache Maven website.

3. IronPDF Java Library: Now you need the latest version of the IronPDF for Java library and should add it as a dependency. Add the following IronPDF Java dependency to your project's pom.xml file:

   <dependency>
       <groupId>com.ironsoftware</groupId>
       <artifactId>ironpdf-jdk8</artifactId>
       <version>2021.9.3663</version>
   </dependency>

   <dependency>
       <groupId>com.ironsoftware</groupId>
       <artifactId>ironpdf-jdk8</artifactId>
       <version>2021.9.3663</version>
   </dependency>

   XML

4. You will also need to add the Slf4j dependency in the pom.xml file.

   <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-simple</artifactId>
       <version>2.0.5</version>
   </dependency>

   <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-simple</artifactId>
       <version>2.0.5</version>
   </dependency>

   XML

Once you have downloaded and installed all the prerequisites, you can use the project for page orientation tasks in Java applications.

Adding Necessary Imports and License Key

First of all, add the following import statements to the top of the main Java source file:

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.edit.PageSelection;
import com.ironsoftware.ironpdf.page.PageRotation;
import com.ironsoftware.ironpdf.render.*;
import java.io.IOException;
import java.nio.file.*;

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.edit.PageSelection;
import com.ironsoftware.ironpdf.page.PageRotation;
import com.ironsoftware.ironpdf.render.*;
import java.io.IOException;
import java.nio.file.*;

Next, in the main method, call License.setLicenseKey to set a valid product license key that you obtained at the time of purchase (skip this step if you do not have a license key, or sign up for a trial license key).

License.setLicenseKey("Your license key");

License.setLicenseKey("Your license key");

Render PDF in Portrait or Landscape Orientation

IronPDF can rotate pages in both portrait and landscape orientation.

// Create render options with landscape orientation
ChromePdfRenderOptions renderOptions = new ChromePdfRenderOptions();
renderOptions.setPaperOrientation(PaperOrientation.LANDSCAPE);

// Render the URL as a PDF document
PdfDocument newPdf = PdfDocument.renderUrlAsPdf("https://ironpdf.com", renderOptions);

// Save the document to the specified path
newPdf.saveAs(Paths.get("assets/LandscapePdf.pdf"));

// Create render options with landscape orientation
ChromePdfRenderOptions renderOptions = new ChromePdfRenderOptions();
renderOptions.setPaperOrientation(PaperOrientation.LANDSCAPE);

// Render the URL as a PDF document
PdfDocument newPdf = PdfDocument.renderUrlAsPdf("https://ironpdf.com", renderOptions);

// Save the document to the specified path
newPdf.saveAs(Paths.get("assets/LandscapePdf.pdf"));

IronPDF uses portrait orientation by default. However, developers can override this orientation while converting content from HTML, RTFs, URLs, etc into PDF documents with a ChromePdfRenderOptions object. The setPaperOrientation method takes a PaperOrientation value as an argument, which allows you to alter the paper orientation of the resulting PDF as desired.

In the above code, the PaperOrientation is set to LANDSCAPE. A PdfDocument class is used to convert a URL to a PDF document using the renderUrlAsPdf method with renderOptions as the second argument.

Finally, the document is saved using the saveAs method in the specified directory.

The output PDF file

Rotating Pages by Rotation Angle

For existing documents, the ChromePdfRenderOptions object cannot be used to change the page orientation. For these existing PDF documents, the page orientation can only be adjusted with rotation-based transformations.

// Load an existing PDF document from the specified path
PdfDocument existingPdf = PdfDocument.fromFile(Paths.get("assets/LandscapePdf.pdf"));

// Rotate the first page of the document 90 degrees clockwise
existingPdf.rotatePage(PageRotation.CLOCKWISE_90, PageSelection.firstPage());

// Rotate all pages of the document 270 degrees clockwise
existingPdf.rotateAllPages(PageRotation.CLOCKWISE_270);

// Save the modified document to the specified path
existingPdf.saveAs(Paths.get("assets/ExistingPdfRotated.pdf"));

// Load an existing PDF document from the specified path
PdfDocument existingPdf = PdfDocument.fromFile(Paths.get("assets/LandscapePdf.pdf"));

// Rotate the first page of the document 90 degrees clockwise
existingPdf.rotatePage(PageRotation.CLOCKWISE_90, PageSelection.firstPage());

// Rotate all pages of the document 270 degrees clockwise
existingPdf.rotateAllPages(PageRotation.CLOCKWISE_270);

// Save the modified document to the specified path
existingPdf.saveAs(Paths.get("assets/ExistingPdfRotated.pdf"));

The above code modifies the PDF document that was created in the previous section. It generated the entire document in landscape previously, but here, IronPDF's rotatePage rotates only the firstPage of the existing document by 90 degrees clockwise (using CLOCKWISE_90). Afterwards, rotateAllPages rotates every page (including the first one) by CLOCKWISE_270.

Rotated PDF Output

Read more about page orientation in the Code Examples section.

IronPDF for Java