获取PDF Java Web中的当前页面 [英] Get the current page in PDF Java Web
问题描述
我需要从我的网络应用程序中读取当前页码。我有:
I need to read the current page number from my web application. I have:
<iframe id="myPdf" src="C:\test.pdf#page=5" style="width: 650px; height: 550px;" />
在页面= 5上打开PDF,用户可以导航到另一个页面。然后,当用户点击按钮/链接时,我需要以PDF格式获取页面的当前索引。
That open the PDF on page = 5, and the user can navigate to another page. Then, when the user click on a button/link, I need to get the current index of the page in PDF.
我的用户使用Acrobat Reader,我无法使用不是来自Adobe的插件。我可以使用Javascript / Java代码。
My users use Acrobat Reader, and I cannot use plugins that aren't from Adobe. I can use Javascript/Java code.
谢谢
Tami
Thanks Tami
推荐答案
我发现我可以使用iText(免费软件)将JavaScript注入pdf文件,
PDF中的JS向html中的容器发送消息。
消息包含当前页面,每次页面更改时都会传递给容器。
I found out that I can use iText (free software) to Inject JavaScript to the pdf file , the JS in the PDF send a message to a container in the html . the message contain the current page , and it is passed to the container each time the page is changed.
我使用pdfobject.js pdfobject.min.js创建捕获消息的PDFJS对象。
I use pdfobject.js pdfobject.min.js to create the PDFJS object that catch the message .
用Java注入JS到PDF的代码:
the code in Java to inject JS to PDF :
public String mAddJS()
{
InputStream vbReaderFile = null;
try
{
vbReaderFile = new FileInputStream("C:\\test.pdf");
PdfReader myReader = new PdfReader( vbReaderFile ); // throws IOException
PdfStamper myStamper = new PdfStamper( myReader, new FileOutputStream("C:\\outTest.pdf") ); // throws IOE, DocumentException
// add a page-open script, 1 is the first page, not zero0
PdfAction jsAction = PdfAction.javaScript ("app.alert('Think again next time!');", myStamper.getWriter());
int pageNum = myReader.getNumberOfPages();
for(int i=1 ; i<pageNum ; i++ )
{
jsAction = PdfAction.javaScript (
"this.disclosed=true;" +
"if(this.hostContainer){" +
"var names = new Array();names[0]=" + i + ";" +
"try{this.hostContainer.postMessage(names);}" +
"catch(e){app.alert(e.message); }"+
"}", myStamper.getWriter());
myStamper.setPageAction( PdfWriter.PAGE_OPEN, jsAction, i);
}
myStamper.close(); // write everything out, throws DocumentException, IOE
vPath = "C:\\outTest.pdf";
// JavascriptContext.addJavascriptCall(FacesContext.getCurrentInstance(), "mChangePDF('C:\\outTest.pdf');");
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
html页面:
<h:body >
<ice:form id="myForm">
<object id="myPDFObj" type="application/pdf" data="test.pdf#page=3"
height="550px" width="650px"></object>
<br/><ice:commandButton onclick="test();" value="test" ></ice:commandButton>
<ice:commandButton action="#{pDFTest.mAddJS}" value="JAVA" partialSubmit="false"></ice:commandButton>
<div id="myDivPdf">
</div>
</ice:form>
</h:body>
html上的JS:
<script type="text/javascript">
var PDF1;
var PDF2;
window.onload = function(evt)
{
createPDF();
createMessageHandler();
}
function createPDF(){
function createPDF(){
PDF1 = new PDFObject({
url: "test.pdf#page=3",
id: "myPDFObj",
width: "500px",
height: "300px"
});
PDF2 = PDF1.embed("myForm:myDivPdf");
};
function createMessageHandler() {
var PDFObject = document.getElementById("myPDFObj");
if(PDFObject==null)
alert('e1');
PDFObject.messageHandler = {
onMessage: function(msg) {
// alert('app');
alert( msg[0]);
},
onError: function(error, msg) {
alert('error.message');
}
}
}
</script>
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