1.首先导入依赖jar包

<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.24</version>
</dependency>

maven仓地址：https://mvnrepository.com/search?q=pdfbox

2.代码片段

import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;

public class Test {
     
     public static void main(String[] args) throws InvalidPasswordException, IOException {
         File file = new File("C:\\Users\\Admin\\Desktop\\test.pdf");
         PDDocument pdDocument = PDDocument.load(file);
         
         // 方法一
         int pages = pdDocument.getNumberOfPages();
         System.out.println("pdf文件的总页数为:" + pages);
         
         // 方发二
         int pages2 =  pdDocument.getPages().getCount();
         System.out.println("pdf文件的总页数为:" + pages2);
        
         // 关闭资源
         pdDocument.close();
    }

}

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