一、引入依赖
<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-words</artifactId>
<version>15.8</version>
</dependency>
<dependency>
<groupId>com.aspose</groupId>
<artifactId>cracked</artifactId>
<version>21.8</version>
</dependency>
二、引入工具类
import com.aspose.words.FontSettings;
import com.aspose.words.License;
import com.aspose.words.SaveFormat;
import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import org.apache.poi.xslf.usermodel.*;
import java.awt.;
import java.awt.image.BufferedImage;
import java.io.;
import java.util.List;
public class PreviewUtil {
/**
* @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,设置PDF页面的大小 A2-A9, 个人觉得A3最合适
document = new Document(PageSize.A3, 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;
// 设置像素或者长宽高,将会影响图片的清晰度，因为只是对图片放大或缩小
if (height > width) {
// A4 - A9
percent = PageSize.A6.getHeight() / height * 100;
} else {
percent = PageSize.A6.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;
}
/**
* @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);
System.out.println("word转换完毕");
} 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;
}
/**
* @param inputStream 源文件输入流
* @param outputStream pdf文件输出流
**/
public static boolean excelToPdf(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 (!getExeclLicense()) {
return false;
}
try {
com.aspose.cells.Workbook wb = new com.aspose.cells.Workbook(inputStream);// 原始excel路径
com.aspose.cells.PdfSaveOptions pdfSaveOptions = new com.aspose.cells.PdfSaveOptions();
pdfSaveOptions.setOnePagePerSheet(false);
int[] autoDrawSheets={3};
//当excel中对应的sheet页宽度太大时，在PDF中会拆断并分页。此处等比缩放。
autoDraw(wb,autoDrawSheets);
int[] showSheets={0};
//隐藏workbook中不需要的sheet页。
printSheetPage(wb,showSheets);
wb.save(outputStream, pdfSaveOptions);
outputStream.flush();
outputStream.close();
System.out.println("excel转换完毕");
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
/**
* 设置打印的sheet 自动拉伸比例
* @param wb
* @param page 自动拉伸的页的sheet数组
*/
public static void autoDraw(com.aspose.cells.Workbook wb,int[] page){
if(null!=page&&page.length>0){
for (int i = 0; i < page.length; i++) {
wb.getWorksheets().get(i).getHorizontalPageBreaks().clear();
wb.getWorksheets().get(i).getVerticalPageBreaks().clear();
}
}
}
/**
* 隐藏workbook中不需要的sheet页。
*
* @param wb
* @param page 显示页的sheet数组
*/
public static void printSheetPage(com.aspose.cells.Workbook wb, int[] page) {
for (int i = 1; i < wb.getWorksheets().getCount(); i++) {
wb.getWorksheets().get(i).setVisible(false);
}
if (null == page || page.length == 0) {
wb.getWorksheets().get(0).setVisible(true);
} else {
for (int i = 0; i < page.length; i++) {
wb.getWorksheets().get(i).setVisible(true);
}
}
}
public static boolean getExeclLicense() {
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());
com.aspose.cells.License aposeLic = new com.aspose.cells.License();
aposeLic.setLicense(is);
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* pptxToPdf
* @param inputStream
* @param outputStream
* @return
*/
public static boolean pptxToPdf(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();
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 {
if (document != null) {
document.close();
}
if (pdfWriter != null) {
pdfWriter.close();
}
}
System.out.println("pptx转换完毕");
return true;
}}
三、调用工具类
public void pdfPreview (@RequestParam("fileId") String fileId, HttpServletResponse response){
SysFileInfo sysFileInfo = projectInfoService.getPdfByFileId(fileId);
byte[] fileBytes = FileUtilsNew.getFileByteByUrl(sysFileInfo.getFileUrl());
ByteArrayInputStream byteArrayInputStream = null;
ByteArrayOutputStream byteArrayOutputStream=null;
ByteArrayInputStream bais=null;
BufferedInputStream bin=null;
PdfReader reader=null;
try {
byteArrayInputStream=new ByteArrayInputStream(fileBytes);
byteArrayOutputStream=new ByteArrayOutputStream();
boolean needSwitchFlag=true;
byte[] byteArray=new byte[1024];
if (needSwitchFlag){
String typeBig = sysFileInfo.getFileSuffix();
if (typeBig.contains("doc")){
PreviewUtil.wordTopdfByAspose(byteArrayInputStream, byteArrayOutputStream);
}
if (typeBig.contains("xls")){
PreviewUtil.excelToPdf(byteArrayInputStream, byteArrayOutputStream);
}
String[] imgType = new String[]{"jpg", "png", "jpeg", "bmp"};
//判断包含图片类型
if (Arrays.asList(imgType).contains(typeBig)) {
PreviewUtil.imgToPdf(byteArrayInputStream, byteArrayOutputStream);
}
String[] pptType = new String[]{"ppt", "pptx"};
if (Arrays.asList(pptType).contains(typeBig)) {
PreviewUtil.pptxToPdf(byteArrayInputStream, byteArrayOutputStream);
}
byteArray = byteArrayOutputStream.toByteArray();
}else{
byteArray=fileBytes;
}
response.setContentType("application/pdf;charset=utf-8");
response.setCharacterEncoding(UTF_8);
bais = new ByteArrayInputStream(byteArray);
bin = new BufferedInputStream(bais);
reader = new PdfReader(bin);
PdfStamper stamper = new PdfStamper(reader,response.getOutputStream());
PdfGState gs = new PdfGState();
gs.setFillOpacity(1f);// 设置透明度
stamper.close();
}catch (Exception e){
log.error("文件预览异常",e);
}finally {
try {
if(byteArrayInputStream!=null){
byteArrayInputStream.close();
}
}catch (Exception e){
log.error("文件流关闭失败",e);
}
try {
if(byteArrayOutputStream!=null){
byteArrayOutputStream.close();
}
}catch (Exception e){
log.error("文件流关闭失败",e);
}
try {
if(bais!=null){
bais.close();
}
}catch (Exception e){
log.error("文件流关闭失败",e);
}
try {
if(bin!=null){
bin.close();
}
}catch (Exception e){
log.error("文件流关闭失败",e);
}
try {
if(reader!=null){
reader.close();
}
}catch (Exception e){
log.error("文件流关闭失败",e);
}
}
}
小姐姐
