PPT生成PNG---解决中文乱码和字体大小、位置偏移等问题

POI版本：3.15

代码如下：改编自poi源码中的工具类,源码中的出现乱码问题。网上搜的版本生成的图片字体大小和偏移有问题。

package POI;

/*
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* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0 *
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* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
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import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.TreeSet;

import javax.imageio.ImageIO;

import org.apache.poi.sl.draw.DrawFactory;
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;

public class PPT2PNG1 {

static void usage(String error) {
String msg = "Usage: PPTX2PNG [options] <ppt or pptx file>\n"
+ (error == null ? "" : ("Error: " + error + "\n")) + "Options:\n"
+ " -scale <float> scale factor\n" + " -slide <integer> 1-based index of a slide to render\n"
+ " -format <type> png,gif,jpg (,null for testing)"
+ " -outdir <dir> output directory, defaults to origin of the ppt/pptx file"
+ " -quiet do not write to console (for normal processing)";

System.out.println(msg);
// no System.exit here, as we also run in junit tests!
}

public static void main(String[] args) throws Exception {
if (args.length == 0) {
usage(null);
return;
}

String slidenumStr = "-1";
float scale = 1;
File file = null;
String format = "png";
File outdir = null;
boolean quiet = false;

for (int i = 0; i < args.length; i++) {
if (args[i].startsWith("-")) {
if ("-scale".equals(args[i])) {
scale = Float.parseFloat(args[++i]);
} else if ("-slide".equals(args[i])) {
slidenumStr = args[++i];
} else if ("-format".equals(args[i])) {
format = args[++i];
} else if ("-outdir".equals(args[i])) {
System.err.println(args[++i]);
outdir = new File(args[++i]);
} else if ("-quiet".equals(args[i])) {
quiet = true;
}
} else {
file = new File(args[i]);
}
}

if (format == null || !format.matches("^(png|gif|jpg|null)$")) {
usage("Invalid format given");
return;
}

if (outdir == null) {
outdir = file.getParentFile();
}

if (!"null".equals(format) && (outdir == null || !outdir.exists() || !outdir.isDirectory())) {
usage("Output directory doesn't exist");
return;
}

if (scale < 0) {
usage("Invalid scale given");
return;
}

if (!quiet) {
System.out.println("Processing " + file);
}
FileInputStream is =new FileInputStream(file);
XMLSlideShow ppt = new XMLSlideShow(is);
try {
List<XSLFSlide> slides = ppt.getSlides();
Set<Integer> slidenum = slideIndexes(slides.size(), slidenumStr);

if (slidenum.isEmpty()) {
usage("slidenum must be either -1 (for all) or within range: [1.." + slides.size() + "] for " + file);
return;
}

Dimension pgsize = ppt.getPageSize();
int width = (int) (pgsize.width * scale);
int height = (int) (pgsize.height * scale);

for (Integer slideNo : slidenum) {
XSLFSlide slide = slides.get(slideNo);
for (XSLFShape shape : ppt.getSlides().get(slideNo).getShapes()) {
if (shape instanceof XSLFTextShape) {
XSLFTextShape tsh = (XSLFTextShape) shape;
for (XSLFTextParagraph p : tsh) {
for (XSLFTextRun r : p) {
r.setFontFamily("宋体");
}
}
}
}
String title = slide.getTitle();
if (!quiet) {
System.out.println("Rendering slide " + slideNo + (title == null ? "" : ": " + title));
}

BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = img.createGraphics();
DrawFactory.getInstance(graphics).fixFonts(graphics);

// default rendering options
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON);

graphics.scale(scale, scale);
// draw stuff
slide.draw(graphics);

// save the result
if (!"null".equals(format)) {
String outname = file.getName().replaceFirst(".pptx?", "");
outname = String.format(Locale.ROOT, "%1$s-%2$04d.%3$s", outname, slideNo, format);
File outfile = new File(outdir, outname);
ImageIO.write(img, format, outfile);
}

graphics.dispose();
img.flush();
}
} finally {
ppt.close();
is.close();
}

if (!quiet) {
System.out.println("Done");
}
}

private static Set<Integer> slideIndexes(final int slideCount, String range) {
Set<Integer> slideIdx = new TreeSet<Integer>();
if ("-1".equals(range)) {
for (int i = 0; i < slideCount; i++) {
slideIdx.add(i);
}
} else {
for (String subrange : range.split(",")) {
String idx[] = subrange.split("-");
switch (idx.length) {
default:
case 0:
break;
case 1: {
int subidx = Integer.parseInt(idx[0]);
if (subrange.contains("-")) {
int startIdx = subrange.startsWith("-") ? 0 : subidx;
int endIdx = subrange.endsWith("-") ? slideCount : Math.min(subidx, slideCount);
for (int i = Math.max(startIdx, 1); i < endIdx; i++) {
slideIdx.add(i - 1);
}
} else {
slideIdx.add(Math.max(subidx, 1) - 1);
}
break;
}
case 2: {
int startIdx = Math.min(Integer.parseInt(idx[0]), slideCount);
int endIdx = Math.min(Integer.parseInt(idx[1]), slideCount);
for (int i = Math.max(startIdx, 1); i < endIdx; i++) {
slideIdx.add(i - 1);
}
break;
}
}
}
}
return slideIdx;
}
}