java读取PDF流的页数

依赖

<dependency>  
    <groupId>com.itextpdf</groupId> 
    <artifactId>itextpdf</artifactId> 
    <version>5.5.6</version>
</dependency>

代码

PdfReader pdfReader = new PdfReader(stream2);            
int pages = pdfReader.getNumberOfPages();