Rotate a PDF page using Java

When viewing a PDF document, if you find the page orientation is wrong, then you’ll need to adjust the page to the right orientation for better viewing. Today, this article will introduce how to rotate a PDF page with Free Spire.PDF for Java.

Import jar dependency (2 Methods)
● Download the Free Spire.PDF for Java and unzip it.Then add the Spire.Pdf.jar file to your project as dependency.

● You can also add the jar dependency to maven project by adding the following configurations to the pom.xml.

<span><repositories></span>
        <span><repository></span>
            <span><id></span>com.e-iceblue<span></id></span>
            <span><name></span>e-iceblue<span></name></span>
            <span><url></span>http://repo.e-iceblue.com/nexus/content/groups/public/<span></url></span>
        <span></repository></span>
<span></repositories></span>
<span><dependencies></span>
    <span><dependency></span>
        <span><groupId></span>e-iceblue<span></groupId></span>
        <span><artifactId></span>spire.pdf.free<span></artifactId></span>
        <span><version></span>3.9.0<span></version></span>
    <span></dependency></span>
<span></dependencies></span>
<span><repositories></span>
        <span><repository></span>
            <span><id></span>com.e-iceblue<span></id></span>
            <span><name></span>e-iceblue<span></name></span>
            <span><url></span>http://repo.e-iceblue.com/nexus/content/groups/public/<span></url></span>
        <span></repository></span>
<span></repositories></span>
<span><dependencies></span>
    <span><dependency></span>
        <span><groupId></span>e-iceblue<span></groupId></span>
        <span><artifactId></span>spire.pdf.free<span></artifactId></span>
        <span><version></span>3.9.0<span></version></span>
    <span></dependency></span>
<span></dependencies></span>
<repositories>
        <repository>
            <id>com.e-iceblue</id>
            <name>e-iceblue</name>
            <url>http://repo.e-iceblue.com/nexus/content/groups/public/</url>
        </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf.free</artifactId>
        <version>3.9.0</version>
    </dependency>
</dependencies>

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Below is the screenshot of the input.pdf file:

Java Code

<span>import</span> <span>com.spire.pdf.PdfDocument</span><span>;</span>
<span>import</span> <span>com.spire.pdf.PdfPageBase</span><span>;</span>
<span>import</span> <span>com.spire.pdf.PdfPageRotateAngle</span><span>;</span>
<span>import</span> <span>java.io.IOException</span><span>;</span>
<span>public</span> <span>class</span> <span>RotatePDFPage</span> <span>{</span>
    <span>public</span> <span>static</span> <span>void</span> <span>main</span><span>(</span><span>String</span><span>[]</span> <span>args</span><span>)</span> <span>throws</span> <span>IOException</span> <span>{</span>
        <span>//Load the PDF document</span>
        <span>PdfDocument</span> <span>pdf</span> <span>=</span> <span>new</span> <span>PdfDocument</span><span>();</span>
        <span>pdf</span><span>.</span><span>loadFromFile</span><span>(</span><span>"input.pdf"</span><span>);</span>
        <span>//Get the first page</span>
        <span>PdfPageBase</span> <span>page</span> <span>=</span> <span>pdf</span><span>.</span><span>getPages</span><span>().</span><span>get</span><span>(</span><span>0</span><span>);</span>
        <span>//Get the original rotation angle of the page</span>
        <span>int</span> <span>rotateAngle</span> <span>=</span> <span>page</span><span>.</span><span>getRotation</span><span>().</span><span>getValue</span><span>();</span>
        <span>//Rotate the PDF page 90 degrees clockwise based on the original rotation angle</span>
        <span>rotateAngle</span> <span>+=</span> <span>PdfPageRotateAngle</span><span>.</span><span>Rotate_Angle_90</span><span>.</span><span>getValue</span><span>();</span>
        <span>page</span><span>.</span><span>setRotation</span><span>((</span><span>PdfPageRotateAngle</span><span>.</span><span>fromValue</span><span>(</span><span>rotateAngle</span><span>)));</span>
        <span>//Save the PDF document</span>
        <span>pdf</span><span>.</span><span>saveToFile</span><span>(</span><span>"Rotated.pdf"</span><span>);</span>
    <span>}</span>
<span>}</span>
<span>import</span> <span>com.spire.pdf.PdfDocument</span><span>;</span>
<span>import</span> <span>com.spire.pdf.PdfPageBase</span><span>;</span>
<span>import</span> <span>com.spire.pdf.PdfPageRotateAngle</span><span>;</span>

<span>import</span> <span>java.io.IOException</span><span>;</span>

<span>public</span> <span>class</span> <span>RotatePDFPage</span> <span>{</span>
    <span>public</span> <span>static</span> <span>void</span> <span>main</span><span>(</span><span>String</span><span>[]</span> <span>args</span><span>)</span> <span>throws</span> <span>IOException</span> <span>{</span>
        <span>//Load the PDF document</span>
        <span>PdfDocument</span> <span>pdf</span> <span>=</span> <span>new</span> <span>PdfDocument</span><span>();</span>
        <span>pdf</span><span>.</span><span>loadFromFile</span><span>(</span><span>"input.pdf"</span><span>);</span>

        <span>//Get the first page</span>
        <span>PdfPageBase</span> <span>page</span> <span>=</span> <span>pdf</span><span>.</span><span>getPages</span><span>().</span><span>get</span><span>(</span><span>0</span><span>);</span>

        <span>//Get the original rotation angle of the page</span>
        <span>int</span> <span>rotateAngle</span> <span>=</span> <span>page</span><span>.</span><span>getRotation</span><span>().</span><span>getValue</span><span>();</span>

        <span>//Rotate the PDF page 90 degrees clockwise based on the original rotation angle</span>
        <span>rotateAngle</span> <span>+=</span> <span>PdfPageRotateAngle</span><span>.</span><span>Rotate_Angle_90</span><span>.</span><span>getValue</span><span>();</span>
        <span>page</span><span>.</span><span>setRotation</span><span>((</span><span>PdfPageRotateAngle</span><span>.</span><span>fromValue</span><span>(</span><span>rotateAngle</span><span>)));</span>

        <span>//Save the PDF document</span>
        <span>pdf</span><span>.</span><span>saveToFile</span><span>(</span><span>"Rotated.pdf"</span><span>);</span>
    <span>}</span>
<span>}</span>
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.PdfPageRotateAngle;

import java.io.IOException;

public class RotatePDFPage {
    public static void main(String[] args) throws IOException {
        //Load the PDF document
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("input.pdf");

        //Get the first page
        PdfPageBase page = pdf.getPages().get(0);

        //Get the original rotation angle of the page
        int rotateAngle = page.getRotation().getValue();

        //Rotate the PDF page 90 degrees clockwise based on the original rotation angle
        rotateAngle += PdfPageRotateAngle.Rotate_Angle_90.getValue();
        page.setRotation((PdfPageRotateAngle.fromValue(rotateAngle)));

        //Save the PDF document
        pdf.saveToFile("Rotated.pdf");
    }
}

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The screenshot of the generated pdf file:

原文链接：Rotate a PDF page using Java