java利用第三方jar实现excel,word,ppt,txt转pdf格式

最近项目有文件模块的上传预览功能，比如把word文档上传，以后点击可以预览。采用的思路为：文件上传到服务器，然后获取转换成对应的新的PDF文件，然后读取PDF文件。本文着重实现文档上传然后转为PDF。所需jar:   链接： 
提取码：t2rn

如果遇到利用aspose 把excel转pdf遇到复杂文件被拆分成多页的情况，添加如下代码：

 PdfSaveOptions pOptions = new PdfSaveOptions();
 pOptions.setAllColumnsInOnePagePerSheet(true);
 excel.save(destFilePath,pOptions);

文件上传代码：

    public String fileUpload(HttpServletRequest request, HttpServletResponse response) {String saveDirectory = request.getServletContext().getRealPath("/upload");//上传路径// 将当前上下文初始化给 CommonsMutipartResolver （多部分解析器）CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());if (multipartResolver.isMultipart(request)) {// 将request变成多部分requestMultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;// 获取multiRequest 中所有的文件名Iterator iter = multiRequest.getFileNames();String extName = "";// 扩展名while (iter.hasNext()) {// 一次遍历所有文件MultipartFile file = multiRequest.getFile(iter.next().toString());if (file != null) {try {InputStream is = file.getInputStream();//获取文件md5值判断是否有重复，如果有文件就不上传，直接读取String fileHashCode = MD5Util.md5HashCode32(is);String originalFileName = file.getOriginalFilename();//获取扩展名extName = originalFileName.substring(originalFileName.lastIndexOf("."));//源文件上传地址String sourceFilePath = saveDirectory + File.separator + fileHashCode + extName;//生成的目标文件地址String destinatFilePath = request.getServletContext.getRealPath("/convert")+File.separator+fileHashCode + ".pdf";

　　　　　　　　　　　　　　// 表示文件已存在不需要上传

　　　　　　　　　　　　　　 if (new File(sourceFilePath).exists()) { 

　　　　　　　　　　　　　　　　　　continue;//跳出本次循环} else {file.transferTo(new File(path));// 生成新的文件file.getInputStream().close();//流关最好在finally里关闭// 文件转换工具用于转换文件，最好新开线程，对文件较大的需要等待时间。参数（源文件路径，目标文件路径）FileConvertUtils.convert(sourceFilePath, destinatFilePath);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}return "请选择文件上传！";}return "文件上传请求配置错误！";}

定义函数用于判断调用哪个转换函数：

public class FileConvertUtils {public static final Logger log = LoggerFactory.getLogger(FileConvertUtils.class);public static void convert(final String sourceFilePath ,final String destFilePath){String fileType = sourceFilePath.substring(sourceFilePath.lastIndexOf("."));ExecutorService executor = Executors.newCachedThreadPool() ;executor.submit(() -> {try {//要执行的业务代码，if(!"".equals(fileType)&&fileType!=null){if(".doc".equals(fileType)||".docx".equals(fileType)||".wps".equals(fileType)){OfficeToPdfUtils.word2Pdf(sourceFilePath,destFilePath);}else if(".txt".equals(fileType)){OfficeToPdfUtils.word2Pdf(sourceFilePath,destFilePath);}else if(".xls".equals(fileType)||".xlsx".equals(fileType)){OfficeToPdfUtils.excel2Pdf(sourceFilePath,destFilePath);}else if(".ppt".equals(fileType)||".pptx".equals(fileType)){OfficeToPdfUtils.ppt2Pdf(sourceFilePath,destFilePath);}else if(".pdf".equals(fileType)){FileUtils.copyFile(sourceFilePath, destFilePath);}}}catch(Exception e) {e.printStackTrace();throw new RuntimeException("报错啦！！");}});}}

文件转换核心代码：

package com.hhwy.fileview.convert;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import com.aspose.cells.Workbook;
import com.aspose.pdf.SaveFormat;
import com.aspose.slides.Presentation;
import com.aspose.words.Document;
import com.hhwy.fweb.framework.api.utils.IoTools;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;import java.io.*;public class OfficeToPdfUtils {/*** The constant LOG.**/private static final Logger LOG = LoggerFactory.getLogger(OfficeToPdfUtils.class);/*** 获取license** @return*/public static boolean getWordLicense() {boolean result = false;try {InputStream license = new FileInputStream(new File(IoTools.getABSPATH() + "WEB-INF/license.xml"));// license路径，这里我引用的是公司的包获取路径，这边自己可以定义指定路径com.aspose.words.License aposeLic = new com.aspose.words.License();aposeLic.setLicense(license);result = true;} catch (Exception e) {e.printStackTrace();}return result;}public static boolean getPPTLicense() {boolean result = false;try {InputStream license = new FileInputStream(new File(IoTools.getABSPATH() + "WEB-INF/license.xml"));// license路径com.aspose.slides.License aposeLic = new com.aspose.slides.License();aposeLic.setLicense(license);result = true;} catch (Exception e) {e.printStackTrace();}return result;}public static boolean getExcelLicense() {boolean result = false;try {InputStream license = new FileInputStream(new File(IoTools.getABSPATH() + "WEB-INF/license.xml"));// license路径com.aspose.cells.License aposeLic = new com.aspose.cells.License();aposeLic.setLicense(license);result = true;} catch (Exception e) {e.printStackTrace();}return result;}public static void word2Pdf(String resourceFilePath, String destFilePath) {InputStream wordIn = null;try {wordIn = new FileInputStream(new File(resourceFilePath));} catch (FileNotFoundException e) {e.printStackTrace();}FileOutputStream fileOS = null;// 验证Licenseif (!getWordLicense()) {LOG.error("验证License失败！");return;}try {Document doc = new Document(wordIn);fileOS = new FileOutputStream(new File(destFilePath));// 保存转换的pdf文件doc.save(fileOS, com.aspose.words.SaveFormat.PDF);} catch (Exception e) {LOG.error("error:", e);} finally {try {if(fileOS != null){fileOS.close();}} catch (IOException e) {LOG.error("error:", e);}}}public static void ppt2Pdf(String resourceFilePath, String destFilePath){InputStream wordIn = null;try {wordIn = new FileInputStream(new File(resourceFilePath));} catch (FileNotFoundException e) {e.printStackTrace();}FileOutputStream fileOS = null;// 验证Licenseif (!getPPTLicense()) {LOG.error("验证License失败！");return;}try {fileOS = new FileOutputStream(new File(destFilePath));Presentation ppt = new Presentation(wordIn);//此处不可写SaveFormat.Pdf,这样转换能生成文件，但是转换的文件无法打开ppt.save(fileOS, com.aspose.slides.SaveFormat.Pdf);} catch (Exception e) {LOG.error("error:", e);} finally {try {if(fileOS != null){fileOS.close();}} catch (IOException e) {LOG.error("error:", e);}}}public static void word2Html(String resourceFilePath, String destFilePath) {InputStream wordIn = null;try {wordIn = new FileInputStream(new File(resourceFilePath));} catch (FileNotFoundException e) {e.printStackTrace();}FileOutputStream fileOS = null;// 验证Licenseif (!getWordLicense()) {LOG.error("验证License失败！");return;}try {Document doc = new Document(wordIn);fileOS = new FileOutputStream(new File(destFilePath));// 保存转换的pdf文件doc.save(fileOS, com.aspose.words.SaveFormat.HTML);} catch (Exception e) {LOG.error("error:", e);} finally {try {if(fileOS != null){fileOS.close();}} catch (IOException e) {LOG.error("error:", e);}}}public static void excel2Pdf(String resourceFilePath, String destFilePath){InputStream in = null;try {in = new FileInputStream(new File(resourceFilePath));} catch (FileNotFoundException e) {e.printStackTrace();}FileOutputStream fileOS = null;// 验证Licenseif (!getExcelLicense()) {LOG.error("验证License失败！");return;}try {fileOS = new FileOutputStream(new File(destFilePath));Workbook excel = new Workbook(in);excel.save(destFilePath,com.aspose.cells.SaveFormat.PDF);} catch (Exception e) {LOG.error("error:", e);} finally {try {if(fileOS != null){fileOS.close();System.out.println("转换已完成！");}} catch (IOException e) {LOG.error("error:", e);}}}public static void main(String[] args) {word2Pdf("/Users/workspace/docs/test.docx","/Users/workspace/docs/test.pdf");/*  InputStream pptIn = new FileInputStream(new File("/Users/workspace/docs/test.pptx"));ppt2Pdf(pptIn,"/Users/workspace/docs/test-ppt.pdf");InputStream excelIn = new FileInputStream(new File("/Users/workspace/docs/test.xlsx"));excel2Pdf(excelIn,"D:\\aspose\\test-excel.pdf");InputStream txtIn = new FileInputStream(new File("/Users/workspace/docs/test.txt"));word2Pdf(txtIn,"/Users/workspace/docs/test-txt.pdf");*/}
}

本在实现上还有许多需要优化的地方，比如如何得知某文件何时转换成功，文件夹，文件不存在时候的判断等。后续优化后再更新。

针对无法获取文件何时转换成功，修改了FileConvertUtils 使其实现Callable接口，定义线程池在上传文件外部调用该类，代码：

public class FileConvertUtils implements Callable<Integer>{private String sourceFilePath;private String destFilePath;FileConvertUtils(String sourceFilePath,String destFilePath){this.sourceFilePath = sourceFilePath;this.destFilePath = destFilePath;}public void convert(String sourceFilePath,String destFilePath){String fileType = sourceFilePath.substring(sourceFilePath.lastIndexOf("."));try {//要执行的业务代码，if(!"".equals(fileType)&&fileType!=null){if(".doc".equals(fileType)||".docx".equals(fileType)||".wps".equals(fileType)){OfficeToPdfUtils.word2Pdf(sourceFilePath,destFilePath);}else if(".txt".equals(fileType)){OfficeToPdfUtils.word2Pdf(sourceFilePath,destFilePath);}else if(".xls".equals(fileType)||".xlsx".equals(fileType)){OfficeToPdfUtils.excel2Pdf(sourceFilePath,destFilePath);}else if(".ppt".equals(fileType)||".pptx".equals(fileType)){OfficeToPdfUtils.ppt2Pdf(sourceFilePath,destFilePath);}else if(".pdf".equals(fileType)){FileUtils.copyFile(sourceFilePath, destFilePath);}}}catch(Exception e) {e.printStackTrace();throw new RuntimeException("报错啦！！");}      }@Overridepublic Integer call() throws Exception {this.convert(sourceFilePath, destFilePath);return 1;//通过future.get可以获取改返回值，表示执行完成}

调用处代码：

                            ExecutorService executor = Executors.newCachedThreadPool();Future<Integer> future = executor.submit(new FileConvertUtils(sourceFilePath,destinatFilePath));System.out.println("=================="+future.get());//如果返回1,则调用成功，否则get方法会一直阻塞。

增加ppt转图片操作方法：

    /*** pptToImage* @param resourceFilePath* @param destFilePath*/public static void ppt2Image(String resourceFilePath,String destFilePath){InputStream wordIn = null;try {wordIn = new FileInputStream(new File(resourceFilePath));} catch (Exception e) {e.printStackTrace();}FileOutputStream fileOS = null;//验证licenseif(!getPPTLicense()){LOG.error("验证License失败！");return;}try {Presentation ppt = new Presentation(wordIn);int i=0;for(;i<ppt.getSlides().size();i++){ISlide slide = ppt.getSlides().get_Item(i);int hight = (int) (ppt.getSlideSize().getSize().getHeight()-150);int width = (int) (ppt.getSlideSize().getSize().getWidth()-150);BufferedImage image = slide.getThumbnail(new Dimension(width,hight));//每页输出一张图片File outImage = new File(destFilePath.replace(".pdf","")+i+".JPG");ImageIO.write(image, "JPG", outImage);}} catch (Exception e) {e.printStackTrace();}}

destinatFilePath