Apache POI PPT - 幻灯片管理



完成本章后,您将能够删除、重新排序以及对幻灯片执行读写操作。

更改幻灯片

我们可以使用XMLSlideShow类的setPageSize()方法更改幻灯片的页面大小。

最初,创建一个如下所示的演示文稿:

File file = new File("C://POIPPT//Examples// TitleAndContentLayout.pptx");

//create presentation
XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(file));

使用XMLSlideShow类的getPageSize()方法获取当前幻灯片的大小。

java.awt.Dimension pgsize = ppt.getPageSize();

使用setPageSize()方法设置页面大小。

ppt.setPageSize(new java.awt.Dimension(1024, 768));

更改幻灯片大小的完整程序如下所示:

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.xslf.usermodel.XMLSlideShow;

public class ChangingSlide {
   public static void main(String args[]) throws IOException {
      //create file object
      File file = new File("TitleAndContentLayout.pptx");
	 
      //create presentation
      XMLSlideShow ppt = new XMLSlideShow();
      
      //getting the current page size
      java.awt.Dimension pgsize = ppt.getPageSize();
      int pgw = pgsize.width; //slide width in points
      int pgh = pgsize.height; //slide height in points
      
      System.out.println("current page size of the PPT is:");
      System.out.println("width :" + pgw);
      System.out.println("height :" + pgh);
      
      //set new page size
      ppt.setPageSize(new java.awt.Dimension(2048,1536));
      
      //creating file object
      FileOutputStream out = new FileOutputStream(file);
      
      //saving the changes to a file
      ppt.write(out);
      System.out.println("slide size changed to given dimentions ");
      out.close();	
   }
}

将上述 Java 代码保存为ChangingSlide.java,然后从命令提示符处编译并执行它,如下所示:

$javac ChangingSlide.java
$java ChangingSlide

它将编译并执行以生成以下输出。

current page size of the presentation is : 
width :720
height :540
slide size changed to given dimensions

以下是更改幻灯片大小之前的演示文稿快照:

TitleAndContentLayout

更改大小后,幻灯片显示如下:

SlideAfterChange

重新排序幻灯片

您可以使用setSlideOrder()方法设置幻灯片的顺序。以下是设置幻灯片顺序的步骤。

打开一个现有的 PPT 文档,如下所示:

File file = new File("C://POIPPT//Examples//example1.pptx");
XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(file));

使用getSlides()方法获取幻灯片,如下所示:

List<XSLFSlide> slides = ppt.getSlides();

从幻灯片数组中选择一个幻灯片,并使用setSlideOrder()方法更改其顺序,如下所示:

//selecting the fourth slide
XSLFSlide selectesdslide = slides.get(4);

//bringing it to the top
ppt.setSlideOrder(selectesdslide, 1);

以下是重新排序演示文稿中幻灯片的完整程序:

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.apache.poi.xslf.usermodel.XSLFSlide;

public class ReorderSlide {	
   public static void main(String args[]) throws IOException {
      //opening an existing presentation
      File file = new File("example1.pptx");
      XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(file));
      
      //get the slides 
      List<XSLFSlide> slides = ppt.getSlides();    
      
      //selecting the fourth slide
      XSLFSlide selectesdslide = slides.get(13);
      
      //bringing it to the top
      ppt.setSlideOrder(selectesdslide, 0);
      
      //creating an file object 
      FileOutputStream out = new FileOutputStream(file);
	  
      //saving the changes to a file
      ppt.write(out);
      out.close();	
   }
}

将上述 Java 代码保存为ReorderSlide.java,然后从命令提示符处编译并执行它,如下所示:

$javac ReorderSlide.java
$java ReorderSlide

它将编译并执行以生成以下输出。

Reordering of the slides is done

以下是重新排序幻灯片之前的演示文稿快照:

Before Reorder

重新排序幻灯片后,演示文稿显示如下。这里我们选择了带有图片的幻灯片并将其移动到顶部。

After Reorder

删除幻灯片

您可以使用removeSlide()方法删除幻灯片。请按照以下步骤删除幻灯片。

使用XMLSlideShow类打开现有的演示文稿,如下所示:

File file = new File("C://POIPPT//Examples//image.pptx");
XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(file));

使用removeSlide()方法删除所需的幻灯片。此方法接受一个整数参数。将要删除的幻灯片的索引传递给此方法。

ppt.removeSlide(1);

以下是从演示文稿中删除幻灯片的程序:

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.xslf.usermodel.XMLSlideShow;

public class Deleteslide { 
   public static void main(String args[]) throws IOException {
      //Opening an existing slide
      File file = new File("image.pptx");
      XMLSlideShow ppt = new XMLSlideShow(new FileInputStream(file));
      
      //deleting a slide
      ppt.removeSlide(1);
      
      //creating a file object
      FileOutputStream out = new FileOutputStream(file);
      
      //Saving the changes to the presentation
      ppt.write(out);
      out.close();	
   }
}

将上述 Java 代码保存为Deleteslide.java,然后从命令提示符处编译并执行它,如下所示:

$javac Deleteslide.java
$java Deleteslide

它将编译并执行以生成以下输出:

reordering of the slides is done

以下是删除幻灯片之前的演示文稿快照:

After Reorder

删除幻灯片后,演示文稿显示如下:

Delete Slides
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