java使用poi逐页读取ppxt,JAVA-WEB（通过POI）实现PPT在线预览

思路：

获取网络PPT 文件 将PPT每一页的幻灯片都转换成单张图片 用流输出到页面展示

1, 首先获取PPT格式 PPT格式无非两种 PPTX,PPT

2,获取PPT幻灯片页数传递到JSP中

3,JSP循环获取每页PPT

代码：

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics2D;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.util.List;

import javax.imageio.ImageIO;

import org.apache.poi.hslf.HSLFSlideShow;

import org.apache.poi.hslf.model.Slide;

import org.apache.poi.hslf.model.TextRun;

import org.apache.poi.hslf.usermodel.RichTextRun;

import org.apache.poi.hslf.usermodel.SlideShow;

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

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

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

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

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

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

import org.openxmlformats.schemas.drawingml.x2006.main.CTRegularTextRun;

import org.openxmlformats.schemas.drawingml.x2006.main.CTTextBody;

import org.openxmlformats.schemas.drawingml.x2006.main.CTTextCharacterProperties;

import org.openxmlformats.schemas.drawingml.x2006.main.CTTextFont;

import org.openxmlformats.schemas.drawingml.x2006.main.CTTextParagraph;

import org.openxmlformats.schemas.presentationml.x2006.main.CTGroupShape;

import org.openxmlformats.schemas.presentationml.x2006.main.CTShape;

import org.openxmlformats.schemas.presentationml.x2006.main.CTSlide;

import com.yyt.yunbao.common.vo.PptImageResult;

/**

@author Xu Yuanyuan

@version 1.0

@date 2017年4月25日 上午11:11:07

@desc PPT转换为图片

*/

public class PPTToImageUtil {

public static void main(String[] args) {

String url = "http://www.xxx.com/xxx.pptx";//支持ppt和pptx

try {

ByteArrayInputStream pptInput = Utility.readNetFile(url);

PptImageResult result = PPTToImageUtil.convert(".pptx", pptInput);

System.out.println(result.getTotalImage());

System.out.println(result.getImageByteList().size());

} catch (Exception e) {

e.printStackTrace();

}

}

public static PptImageResult convert(String suffix, ByteArrayInputStream pptInput) {

if (pptInput != null) {

if (suffix.endsWith(".pptx")) {

return PPTToImageUtil.ppt2007Img(pptInput);

} else if (suffix.endsWith(".ppt")) {

return PPTToImageUtil.ppt2003Img(pptInput);

}

}

return null;

}

/**

设置PPTX字体

@param slide

*/

private static void setFont(XSLFSlide slide) {

for (XSLFShape shape : slide.getShapes()) {

if (shape instanceof XSLFTextShape) {

XSLFTextShape txtshape = (XSLFTextShape) shape;

for (XSLFTextParagraph paragraph : txtshape.getTextParagraphs()) {

List truns = paragraph.getTextRuns();

for (XSLFTextRun trun : truns) {

trun.setFontFamily("宋体");

double currentFontSize = trun.getFontSize();

if((currentFontSize <=0)||(currentFontSize >=26040)){

trun.setFontSize(30);

}

}

}

}

}

}

/**

转换为2007版的PPT到图片流

@param bais

@return

*/

public static PptImageResult ppt2007Img(ByteArrayInputStream bais) {

PptImageResult result = new PptImageResult();

XMLSlideShow ppt = null;

try {

ppt = new XMLSlideShow(bais);

Dimension pgsize = ppt.getPageSize();

XSLFSlide[] slides = ppt.getSlides();

result.setTotalImage(slides.length);

for (int i = 0; i < slides.length; i++) {

// 设置字体为宋体，解决中文乱码问题

CTSlide xmlObject = slides[i].getXmlObject();

setFont(slides[i]);

CTGroupShape spTree = xmlObject.getCSld().getSpTree();

CTShape[] spArray = spTree.getSpArray();

for (CTShape shape : spArray) {

CTTextBody txBody = shape.getTxBody();

if (txBody == null) {

continue;

}

CTTextParagraph[] pArray = txBody.getPArray();

CTTextFont font = CTTextFont.Factory

.parse(""

+ " "

+ " " + "" + "");

for (CTTextParagraph textParagraph : pArray) {

CTRegularTextRun[] textRuns = textParagraph.getRArray();

for (CTRegularTextRun textRun : textRuns) {

CTTextCharacterProperties properties = textRun.getRPr();

properties.setLatin(font);

}

}

}

BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);

Graphics2D graphics = img.createGraphics();

graphics.setPaint(Color.white);

graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));

slides[i].draw(graphics);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

ImageIO.write(img, "png", baos);

baos.flush();

baos.close();

result.getImageByteList().add(baos.toByteArray());

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bais != null) {

try {

bais.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return result;

}

/**

设置字体防止乱码

@param slide

*/

private static void set2003Font(Slide slide) {

TextRun[] truns = slide.getTextRuns();

if(Utility.isNotEmpty(truns)){

for (TextRun trun: truns) {

RichTextRun[] rtruns = trun.getRichTextRuns();

if(Utility.isNotEmpty(rtruns)){

for (RichTextRun rtrun : rtruns) {

rtrun.setFontIndex(1);

rtrun.setFontName("宋体");

}

}

}

}

}

/**

转换为2003版的PPT到图片流

@param bais

@return

*/

public static PptImageResult ppt2003Img(ByteArrayInputStream bais) {

PptImageResult result = new PptImageResult();

try {

SlideShow ppt = new SlideShow(new HSLFSlideShow(bais));

Dimension pgsize = ppt.getPageSize();

Slide[] slides = ppt.getSlides();

result.setTotalImage(slides.length);

for (int i = 0; i < slides.length; i++) {

set2003Font(slides[i]);

BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);

Graphics2D graphics = img.createGraphics();

graphics.setPaint(Color.white);

graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));

slides[i].draw(graphics);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

ImageIO.write(img, "png", baos);

baos.flush();

baos.close();

result.getImageByteList().add(baos.toByteArray());

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bais != null) {

try {

bais.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return result;

}

}