java实现在线预览功能，需要用到  jacob.dll jacob.jar   预览pdf所需js  pdfobject.min.js

将上传文件转为pdf保存。

　　　　<divclass="control-group"><labelclass="control-label">文件：</label><divclass="controls"><inputtype="file"name="file"id="ck_attach_path"style="width:98%;"/></div></div>

后台保存文件并将文件转换为pdf

    @RequiresPermissions("ha01:haHyjhb:edit")@RequestMapping(value= "save")public String save(HaHyjhb haHyjhb, @RequestParam MultipartFile file,Model model, RedirectAttributes redirectAttributes,HttpServletRequest request, HttpServletResponse response) throwsIOException, ParseException {haHyjhb.setBh(hybh);String xdlj= request.getSession().getServletContext().getRealPath("userfiles")+"\\hy"+haHyjhb.getLx()+"\\"+dateStr+"\\"+hybh+"\\";String path= "";if(!file.isEmpty()){  HaHyzlb haHyzlb= newHaHyzlb();SimpleDateFormat df= new SimpleDateFormat("yyyyMMddHHmmss");//设置日期格式String filename= df.format(new Date());    //保存在服务器的随机文件名//材料编号
haHyzlb.setClhb(filename);haHyzlb.setHybh(hybh);xdlj=xdlj.replaceAll("\\\\", "/");haHyzlb.setLj(xdlj);haHyzlb.setCllx("0");String aa[]=file.getOriginalFilename().split("[.]");String fileName=filename+"."+aa[aa.length-1];haHyzlb.setClywjm(file.getOriginalFilename());haHyzlb.setClmc(fileName);//保存文件
publicUtils.saveFile(file, xdlj,filename, request, response);haHyzlbService.save(haHyzlb);}else{request.setAttribute("msg", "未选择需上传的文件");}haHyjhbService.save(haHyjhb);addMessage(redirectAttributes,"保存会议计划成功");}return "redirect:"+Global.getAdminPath()+"/ha01/haHyjhb/?repage";}

public static voidsaveFile(@RequestParam MultipartFile file,String xdlj,String filename, HttpServletRequest request, HttpServletResponse response) {String path= "";String pdfname= filename + ".pdf";    //装换成pdf文件的名称String refilename= "";    //上传文件的名称if(!file.isEmpty()){//获取上传文件的原名称refilename=file.getOriginalFilename();String aa[]=refilename.split("[.]");filename=filename+"."+aa[aa.length-1];xdlj=xdlj.replaceAll("\\\\", "/");File fpath= newFile(xdlj);if(!fpath.exists()){fpath.mkdirs();}try{  MultipartFile mfile=file;if(mfile!=null){  File localFile= new File(xdlj+filename); path=localFile.getPath();try{  mfile.transferTo(localFile);//将上传文件写到服务器上指定的文件ToPDF top=newToPDF();top.convert2PDF(xdlj+filename, xdlj+pdfname);}catch(IllegalStateException e) {  e.printStackTrace();  }catch(IOException e) {  e.printStackTrace();  }  }  }catch(Exception e) {  e.printStackTrace();  request.setAttribute("msg", refilename+"上传失败");  } }else{request.setAttribute("msg", "未选择需上传的文件");}}

转换pdf工具类

packagecom.thinkgem.jeesite.modules.bc.bc01.web;importjava.io.File;importcom.jacob.activeX.ActiveXComponent;importcom.jacob.com.ComFailException;importcom.jacob.com.ComThread;importcom.jacob.com.Dispatch;public classToPDF {private static final int wdFormatPDF = 17;private static final int xlTypePDF = 0;private static final int ppSaveAsPDF = 32;private static final int msoTrue = -1;private static final int msofalse = 0;/*jacob配置* 把jacob.dll放入 Java\jdk1.5.0_06\jre\bin目录下.把jacob.jar放入 Java\jdk1.5.0_0\jre\lib\ext*/  //直接调用这个方法即可public booleanconvert2PDF(String inputFile, String pdfFile) {String suffix=getFileSufix(inputFile);File file= newFile(inputFile);if(!file.exists()){System.out.println("文件不存在！");return false;}if(suffix.equals("pdf")){System.out.println("PDF not need to convert!");return false;}if(suffix.equals("doc")||suffix.equals("docx")||suffix.equals("txt")){returnword2PDF(inputFile,pdfFile);}else if(suffix.equals("ppt")||suffix.equals("pptx")){returnppt2PDF(inputFile,pdfFile);}else if(suffix.equals("xls")||suffix.equals("xlsx")){returnexcel2PDF(inputFile,pdfFile);}else{System.out.println("文件格式不支持转换!");return false;}}public staticString getFileSufix(String fileName){int splitIndex = fileName.lastIndexOf(".");return fileName.substring(splitIndex + 1);}public booleanword2PDF(String inputFile,String pdfFile){ActiveXComponent app= null;  Dispatch doc= null;boolean result=true;try{//打开word应用程序app = new ActiveXComponent("Word.Application");//设置word不可见app.setProperty("Visible", false);//获得word中所有打开的文档,返回Documents对象Dispatch docs = app.getProperty("Documents").toDispatch();//调用Documents对象中Open方法打开文档，并返回打开的文档对象Documentdoc =Dispatch.call(docs,"Open",inputFile,false,true).toDispatch();Dispatch.call(doc,"ExportAsFixedFormat",pdfFile,wdFormatPDF//word保存为pdf格式宏，值为17
);result= true;}catch(Exception e){result= false;}finally{if (doc != null) {  Dispatch.call(doc,"Close");  }if (app != null) {  app.invoke("Quit");  }}returnresult;}public booleanexcel2PDF(String inputFile,String pdfFile){ActiveXComponent app= null;  Dispatch excel= null;boolean result=true;try{app= new ActiveXComponent("Excel.Application");app.setProperty("Visible", false);Dispatch excels= app.getProperty("Workbooks").toDispatch();excel=Dispatch.call(excels,"Open",inputFile,false,true).toDispatch();Dispatch.call(excel,"ExportAsFixedFormat",xlTypePDF,      pdfFile);result= true;}catch(Exception e){result= false;}finally{if (excel != null) {  Dispatch.call(excel,"Close");  }if (app != null) {  app.invoke("Quit");  }  }returnresult;}public booleanppt2PDF(String srcFilePath, String pdfFilePath){ActiveXComponent app= null;  Dispatch ppt= null;boolean result=true;try{  ComThread.InitSTA();  app= new ActiveXComponent("PowerPoint.Application");  Dispatch ppts= app.getProperty("Presentations").toDispatch();//因POWER.EXE的发布规则为同步，所以设置为同步发布ppt = Dispatch.call(ppts, "Open", srcFilePath, true,//ReadOnlytrue,//Untitled指定文件是否有标题false//WithWindow指定文件是否可见
).toDispatch();  Dispatch.call(ppt,"SaveAs", pdfFilePath, 32); //ppSaveAsPDF为特定值32
result=true; //set flag true;} catch(ComFailException e) {  result=false;  }catch(Exception e) {  result=false;  }finally{if (ppt != null) {  Dispatch.call(ppt,"Close");  }if (app != null) {  app.invoke("Quit");  }  ComThread.Release();  }returnresult;}
}

预览文件

　　<c:iftest="${haHyjhb.cllist ne null and haHyjhb.cllist.size() ne 0}"></br><h4>会议文件列表</h4></br><tableid="contentTable"class="table table-striped table-bordered table-condensed"><thead><tr><th>文件名</th><th>预览</th></tr></thead><tbody><c:forEachitems="${haHyjhb.cllist}"var="haHyjhb"><tr><td>${haHyjhb.clywjm }</td><td><ahref="javascript:void(0);"onclick="filescan('${haHyjhb.id}')">预览</a></td></tr></c:forEach></tbody></table></c:if>

functionfilescan(fileid){top.$.jBox.open("iframe:${ctx}/ha01/haHyjhb/scan?id="+fileid, "文件预览",800,$(top.document).height()-100,{buttons:{"确定":"ok", "关闭":true}, submit:function(v, h, f){}, loaded:function(h){$(".jbox-content", top.document).css("overflow-y","hidden");}, closed:function(){}});}

<%@ page contentType="text/html;charset=UTF-8" %>
<%@ include file="/WEB-INF/views/include/taglib.jsp"%>
<html>
<head><title>资料信息管理</title><styletype="text/css">html,body,#content{width:100%;height:100%;margin:0;padding:0;}</style><scripttype="text/javascript">window.onload= function(){    　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//项目名称varfilepath="${pageContext.request.contextPath}/"+"${saMyclbClxx.lj}".split("/dxzjzx_wz/")[1];varname="${saMyclbClxx.clmc}";vara=name.split(".");varhzm=a[a.length-1];//后缀名varwjm=name.split("."+hzm)[0];//文件名if(hzm=="txt"||hzm=="doc"||hzm=="docx"||hzm=="xls"||hzm=="xlsx"||hzm=="ppt"||hzm=="pptx"||hzm=="pdf"){filepath=filepath+wjm+".pdf";PDFObject.embed(filepath,"#content");//var success = new PDFObject({ url:filepath ,pdfOpenParams: { scrollbars: '0', toolbar: '0', statusbar: '0'}}).embed("content1");
}else if(hzm=="png"||hzm=="jpeg"||hzm=="gif"||hzm=="jpg"){$("#content").html("<img style='background-size:contain|cover;width:100%;height: auto;' src='"+filepath+name+"'  id='ylimg'/>");}else if(hzm=="wav"||hzm=="mp3"||hzm=="midi"||hzm=="wma"||hzm=="swf"||hzm=="flv"||hzm=="wmv"||hzm=="asf"||hzm=="asx"||hzm=="mid"||hzm=="rm"||hzm=="rmvb"||hzm=="mp4"||hzm=="mov"||hzm=="avi"||hzm=="ram"){$("#content").html("<video  src='"+filepath+name+"' controls='controls'></video>");}else{alert("该文件格式不支持预览");}}</script>
</head>
<body><ulclass="nav nav-tabs"></ul><br/><form:formid="inputForm"modelAttribute="saSqmyxxb"action="${ctx}/sa01/saSqmyxxb/save"method="post"class="form-horizontal"><sys:messagecontent="${message}"/>        <divid="content"></div>   </form:form><scripttype="text/javascript"src='${ctxStatic}/js/pdfobject.min.js'></script></body>
</html>