java实现文件预览思路和代码分享
思路：在保存文件的时候，先把文件转成pdf，再转成swf文件，预览的时候地址直接指向这个swf文件即可在浏览器中预览。下面代码赋值就可以使用
1.到百度下载openoffice，并安装到本地的D:\OpenOffice目录下。
2.下载pdf2swf.exe工具到web项目的/WebRoot/swftools下
3.代码实现如下：
调用下面方法即可 convert2SWF(String inputFile)，其中inputFile指向文件的物理地址D:/files/20171122161000D8SzydDq.doc
import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import net.sourceforge.pinyin4j.PinyinHelper;import org.apache.log4j.Logger;import org.artofsolving.jodconverter.OfficeDocumentConverter;import org.artofsolving.jodconverter.office.DefaultOfficeManagerConfiguration;import org.artofsolving.jodconverter.office.OfficeManager;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;/** * OFFICE文档转换服务类 */public class OpenOfficePDFConverter { private static final Logger logger = Logger.getLogger(OpenOfficePDFConverter.class); private static OfficeManager officeManager; /** OpenOffice安装根目录 */ private static String OFFICE_HOME = "D:/openOnline"; private static int[] port = { 8100 }; public void convert2SWF(String inputFile) {//inputFile指向文件的物理地址D:/files/20171122161000D8SzydDq.doc String extend=getExtend(inputFile,""); if(extend.equals("pdf")) { String swfFile = getPinYinHeadChar(getFilePrefix2(inputFile)) + ".swf"; convert2SWF(inputFile, swfFile, extend); } if(extend.equals("doc")||extend.equals("docx")||extend.equals("xls")||extend.equals("pptx")||extend.equals("xlsx")|| extend.equals("ppt")||extend.equals("txt")||extend.equals("odt")) { String pdfFile = getFilePrefix2(inputFile) + ".pdf"; convert2PDF(inputFile, pdfFile, extend); extend=getExtend(pdfFile,""); String swfFile = getPinYinHeadChar(getFilePrefix2(inputFile)) + ".swf"; convert2SWF(pdfFile, swfFile, extend); } } public void convert2SWF(String inputFile, String swfFile, String extend) { File pdfFile = new File(inputFile); File outFile = new File(swfFile); if (!pdfFile.exists()) { logger.info("PDF文件不存在！"); return; } if (outFile.exists()) { logger.info("SWF文件已存在！"); return; } HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); String SWFTOOLS_HOME=request.getSession().getServletContext().getRealPath("/") + "swftools/pdf2swf.exe";
String command = SWFTOOLS_HOME + " \"" + inputFile //---update-for--文件预览无效------ scott@2013/05/22 ADD START + "\" -o " +" \""+ swfFile +" \""+ " -s languagedir=D:\\xpdf-chinese-simplified -T 9 -f";// + "\" -o " + swfFile + " -s languagedir=D:\\xpdf-chinese-simplified -T 9 -f";// ---update-for--文件预览无效----- scott@2013/05/22 ADD END try { // 开始转换文档 Process process = Runtime.getRuntime().exec(command); try { process.waitFor(); logger.info("时间-------"+process.waitFor()); } catch (InterruptedException e) { e.printStackTrace(); } } catch (IOException e) { e.printStackTrace(); } } public void convert2PDF(String inputFile, String pdfFile, String extend) { if (extend.equals("txt")) { String odtFile = getFilePrefix(inputFile) + ".odt"; if (new File(odtFile).exists()) { logger.info("odt文件已存在！"); inputFile = odtFile; } else { try { copyFile(inputFile, odtFile); inputFile = odtFile; } catch (FileNotFoundException e) { logger.info("Odt文档不存在！"); e.printStackTrace(); } } } startService(); //pdfFile = pdfFile.replaceAll(" ", "").replaceAll(" ", ""); logger.info("进行文档转换转换:" + inputFile + " --> " + pdfFile); OfficeDocumentConverter converter = new OfficeDocumentConverter( officeManager); try { converter.convert(new File(inputFile), newFile(pdfFile)); } catch (Exception e) { // TODO: handle exception } stopService(); logger.info("进行文档转换转换---- 结束----"); } public static void startService() { DefaultOfficeManagerConfiguration configuration = new DefaultOfficeManagerConfiguration(); try { // 准备启动服务 configuration.setOfficeHome(OFFICE_HOME);// 设置OpenOffice.org安装目录 // 设置转换端口，默认为8100 configuration.setPortNumbers(port); // 设置任务执行超时为5分钟 configuration.setTaskExecutionTimeout(1000* 60 * 5L); // 设置任务队列超时为24小时 configuration.setTaskQueueTimeout(1000 * 60 * 60 * 24L); officeManager = configuration.buildOfficeManager(); officeManager.start(); // 启动服务 logger.info("office转换服务启动成功!"); } catch (Exception ce) { logger.info("office转换服务启动失败!详细信息:" + ce); } } public static void stopService() { logger.info("关闭office转换服务...."); if (officeManager != null) { officeManager.stop(); } logger.info("关闭office转换成功!"); } /** * 获取文件名称[不含后缀名] * 不去掉文件目录的空格 */ public String getFilePrefix2(String fileName) { int splitIndex = fileName.lastIndexOf("."); return fileName.substring(0, splitIndex); } /** * 获取文件名称[不含后缀名] * * @param * @return String */ public static String getFilePrefix(String fileName) { int splitIndex = fileName.lastIndexOf("."); return fileName.substring(0, splitIndex).replaceAll("\\s*", ""); } /** * 提取每个汉字的首字母 */ public static String getPinYinHeadChar(String str) { String convert = ""; for (int j = 0; j < str.length(); j++) { char word = str.charAt(j); // 提取汉字的首字母 String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(word); if (pinyinArray != null) { convert += pinyinArray[0].charAt(0); } else { convert += word; } } return convert; } /** * 获取文件扩展名 */ public static String getExtend(String filename, String defExt) { if ((filename != null) && (filename.length() > 0)) { int i = filename.lastIndexOf('.'); if ((i > 0) && (i < (filename.length() - 1))) { return (filename.substring(i+1)).toLowerCase(); } } return defExt.toLowerCase(); } /** * 文件复制 *方法摘要：这里一句话描述方法的用途 *@param *@return void */ public static void copyFile(String inputFile,String outputFile) throws FileNotFoundException{ File sFile = new File(inputFile); File tFile = new File(outputFile); FileInputStream fis = new FileInputStream(sFile); FileOutputStream fos = new FileOutputStream(tFile); int temp = 0; byte[] buf = new byte[10240]; try { while((temp = fis.read(buf))!=-1){ fos.write(buf, 0, temp); } } catch (IOException e) { e.printStackTrace(); } finally{ try { fis.close(); fos.close(); } catch (IOException e) { e.printStackTrace(); } } }}