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>
以上是 Java实现在线预览功能 的全部内容， 来源链接： utcz.com/z/391198.html
