Java实现在线预览功能

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。

　　　　<div class="control-group">
            <label class="control-label">文件：</label>
            <div class="controls">
                <input  type="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) throws IOException, ParseException {

            haHyjhb.setBh(hybh);

            String xdlj = request.getSession().getServletContext().getRealPath("userfiles")+"\\hy"+haHyjhb.getLx()+"\\"+dateStr+"\\"+hybh+"\\";

            String path = "";
            if(!file.isEmpty()){  

                HaHyzlb haHyzlb = new HaHyzlb();
                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 void saveFile(@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 = new File(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=new ToPDF();
                        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

package com.thinkgem.jeesite.modules.bc.bc01.web;

import java.io.File;

import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.ComFailException;
import com.jacob.com.ComThread;
import com.jacob.com.Dispatch;

public class ToPDF {
    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 boolean convert2PDF(String inputFile, String pdfFile) {
            String suffix =  getFileSufix(inputFile);
            File file = new File(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")){
                return word2PDF(inputFile,pdfFile);
            }else if(suffix.equals("ppt")||suffix.equals("pptx")){
                return ppt2PDF(inputFile,pdfFile);
            }else if(suffix.equals("xls")||suffix.equals("xlsx")){
                return excel2PDF(inputFile,pdfFile);
            }else{
                System.out.println("文件格式不支持转换!");
                return false;
            }
        }
        public static String getFileSufix(String fileName){
            int splitIndex = fileName.lastIndexOf(".");
            return fileName.substring(splitIndex + 1);
        }
        public boolean word2PDF(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Document
             doc = 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");
            }
        }
            return result;
        }

        public boolean excel2PDF(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");
            }
        }
             return result;
        }

        public boolean ppt2PDF(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,// ReadOnly
                             true,// 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();
                 }
                 return result;
        }
}

预览文件

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

function filescan(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>

    <style type="text/css">
        html,body,#content{
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }
    </style>
    <script type="text/javascript">
     window.onload = function (){    　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//项目名称
         var filepath="${pageContext.request.contextPath}/"+"${saMyclbClxx.lj}".split("/dxzjzx_wz/")[1];
            var name="${saMyclbClxx.clmc}";

        var a=name.split(".");
        var hzm=a[a.length-1];//后缀名
        var wjm=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"){
            $("#content").html("<video  src='"+filepath+name+"' controls='controls'></video>");
        }else{
            alert("该文件格式不支持预览");
        }
      }
    </script>
</head>
<body>
    <ul class="nav nav-tabs">
    </ul><br/>
    <form:form id="inputForm" modelAttribute="saSqmyxxb" action="${ctx}/sa01/saSqmyxxb/save" method="post" class="form-horizontal">
        <sys:message content="${message}"/>
         <div id="content"></div>
    </form:form>

    <script type="text/javascript" src='${ctxStatic}/js/pdfobject.min.js'></script>

</body>
</html>