前提：
面对各种文件转换pdf格式，我下面写的都是一些方法，其中每个方法都以流的方式进行参数的传递。
工具类主体:
package com.win.dfas.file.util;
import cn.hutool.core.util.StrUtil;
import com.aspose.words.*;
import com.aspose.words.HeaderFooter;
import com.aspose.words.HorizontalAlignment;
import com.aspose.words.Paragraph;
import com.aspose.words.Section;
import com.aspose.words.VerticalAlignment;
import com.itextpdf.text.Document;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xslf.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.awt.*;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Iterator;
import java.util.List;
public final class PdfConverUtil {
// 这里放下面的方法
xxxx...
}
img(png)转换pdf：
/**
* @param inputStream 源文件输入流
* @param outputStream pdf文件输出流
**/
public static boolean imgToPdf(InputStream inputStream, OutputStream outputStream) {
Document document = null;
try {
// 创建文档
document = new Document(PageSize.A4, 20, 20, 20, 20);
// 新建pdf文档,具体逻辑看.getInstance方法
PdfWriter.getInstance(document, outputStream);
document.open();
document.newPage();
// 将文件流转换为字节流，便于格式转换
BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int length = 0 ;
while (-1 != (length = bufferedInputStream.read(bytes))) {
byteArrayOutputStream.write(bytes, 0, length);
}
// 处理img图片
Image image = Image.getInstance(byteArrayOutputStream.toByteArray());
float height = image.getHeight();
float width = image.getWidth();
float percent = 0.0f;
if (height > width) {
percent = PageSize.A4.getHeight() / height * 100;
} else {
percent = PageSize.A4.getWidth() / width * 100;
}
image.setAlignment(Image.MIDDLE);
image.scalePercent(percent);
// 将图片放入文档中，完成pdf转换
document.add(image);
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
if (document != null) {
document.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return true;
}
word(doc/docx)转换pdf：
/**
* @param inputStream 源文件输入流
* @param outputStream pdf文件输出流
**/
public static boolean wordTopdfByAspose(InputStream inputStream, OutputStream outputStream) {
// 验证License 若不验证则转化出的pdf文档会有水印产生
if (!getLicense()) {
return false;
}
try {
// 将源文件保存在com.aspose.words.Document中，具体的转换格式依靠里面的save方法
com.aspose.words.Document doc = new com.aspose.words.Document(inputStream);
// 全面支持DOC, DOCX, OOXML, RTF HTML, OpenDocument, PDF,EPUB, XPS, SWF 相互转换
doc.save(outputStream, SaveFormat.PDF);
} catch (Exception e) {
e.printStackTrace();
return false;
}finally {
if (outputStream != null) {
try {
outputStream.flush();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
// 官方文档的要求 无需理会
public static boolean getLicense() {
boolean result = false;
try {
String s = "<License><Data><Products><Product>Aspose.Total for Java</Product><Product>Aspose.Words for Java</Product></Products><EditionType>Enterprise</EditionType><SubscriptionExpiry>20991231</SubscriptionExpiry><LicenseExpiry>20991231</LicenseExpiry><SerialNumber>8bfe198c-7f0c-4ef8-8ff0-acc3237bf0d7</SerialNumber></Data><Signature>sNLLKGMUdF0r8O1kKilWAGdgfs2BvJb/2Xp8p5iuDVfZXmhppo+d0Ran1P9TKdjV4ABwAgKXxJ3jcQTqE/2IRfqwnPf8itN8aFZlV3TJPYeD3yWE7IT55Gz6EijUpC7aKeoohTb4w2fpox58wWoF3SNp6sK6jDfiAUGEHYJ9pjU=</Signature></License>";
ByteArrayInputStream is = new ByteArrayInputStream(s.getBytes());
License aposeLic = new License();
aposeLic.setLicense(is);
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
excel(xlsx)转换pdf：
/**
* @param inputStream 源文件输入流
* @param outputStream pdf文件输出流
**/
public static boolean excelToPdf(InputStream inputStream, OutputStream outputStream) {
XSSFWorkbook workbook = null;
Document document = null;
try {
workbook = new XSSFWorkbook(inputStream);
// 创建文档
document = new Document();
// 新建pdf文件
PdfWriter.getInstance(document, outputStream);
document.open();
// 以下都是处理excel表格转换pdf需要的步骤
BaseFont baseFont = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
Font font = new Font(baseFont, 10, Font.NORMAL);
int sheets = workbook.getNumberOfSheets();
for (int i = 0; i < sheets; i++) {
XSSFSheet sheet = workbook.getSheetAt(i);
int cells = 0;
if(null != sheet.getRow(sheet.getFirstRowNum())) {
cells = sheet.getRow(sheet.getFirstRowNum()).getLastCellNum();
}
if (cells == 0) {
continue;
}
PdfPTable pdfPTable = new PdfPTable(cells);
PdfPCell pdfPCell = null;
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
CellType cellType = cell.getCellType();
if (cellType == CellType.NUMERIC) {
pdfPCell = new PdfPCell(new Phrase(cell.getNumericCellValue() + StrUtil.EMPTY));
} else if (cellType == CellType.STRING) {
pdfPCell = new PdfPCell(new Phrase(cell.getStringCellValue(), font));
}
pdfPTable.addCell(pdfPCell);
}
}
document.add(pdfPTable);
}
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
if (document != null) {
document.close();
}
if (workbook != null) {
workbook.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return true;
}
ppt(ppt/pptx)转换pdf：
/**
* @param inputStream 源文件输入流
* @param outputStream pdf文件输出流
**/
public static boolean pptToPdf(InputStream inputStream, OutputStream outputStream) {
Document document = null;
XMLSlideShow slideShow = null;
PdfWriter pdfWriter = null;
try {
slideShow = new XMLSlideShow(inputStream);
Dimension dimension = slideShow.getPageSize();
document = new Document();
// 新建pdf文件
pdfWriter = PdfWriter.getInstance(document, outputStream);
document.open();
PdfPTable pdfPTable = new PdfPTable(1);
List<XSLFSlide> slideList = slideShow.getSlides();
for (int i = 0, row = slideList.size(); i < row; i++) {
XSLFSlide slide = slideList.get(i);
// 设置字体, 解决中文乱码
for (XSLFShape shape : slide.getShapes()) {
XSLFTextShape textShape = (XSLFTextShape) shape;
for (XSLFTextParagraph textParagraph : textShape.getTextParagraphs()) {
for (XSLFTextRun textRun : textParagraph.getTextRuns()) {
textRun.setFontFamily("宋体");
}
}
}
BufferedImage bufferedImage = new BufferedImage((int)dimension.getWidth(), (int)dimension.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2d = bufferedImage.createGraphics();
graphics2d.setPaint(Color.white);
graphics2d.setFont(new java.awt.Font("宋体", java.awt.Font.PLAIN, 12));
slide.draw(graphics2d);
graphics2d.dispose();
Image image = Image.getInstance(bufferedImage, null);
image.scalePercent(50f);
// 写入单元格
pdfPTable.addCell(new PdfPCell(image, true));
document.add(image);
}
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
if (document != null) {
document.close();
}
if (pdfWriter != null) {
pdfWriter.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return true;
}