read zip attachment in visualforce page - salesforce

Question

Hi all I am developing an app on salesforce.
I want to read the content of the file which is inside the zip attachment in visualforce page but without extracting the zip file.
How can I achieve this? Is there any way to do this?

Answer 1

Update for modified question:
Have a look at Handling Office Files and Zip Files in Apex – Part 2 by Andrew Fawcett.
There is a basic Knowledge Article on how to do this with an image that is stored in an Attachment. See How can I Display Base64 Data on page layout?
In this example the AttachmentID is passed via a query string paramemter, but you could look it up however works best for your requirement.
Visualforce page:
<apex:page controller="ViewImage" cache="true">
<img src="data:{!att.ContentType};base64,{!image}" />
</apex:page>
Controller:
public class ViewImage {
public Attachment att {
get {
if (att == null) {
String id = ApexPages.currentPage().getParameters().get('AttachmentID');
att = [SELECT Body, ContentType, Name FROM Attachment WHERE ID = :id];
}
return att;
}
private set;
}
public String image {
get {
return EncodingUtil.Base64Encode(att.body);
}
}
}

Answer 2

Hi all I have achieved this using JSzip library here is my code --
In apex page I have written javascript function --
function viewContent(){
var zip = null;
var zipFileName = null;
var zipFileNames = null;
data = "{!contentAsText}";
zip = new JSZip(data, {base64:true});
zipFileName = 'files.zip';
zipFileNames = [];
for(var zipfileName in zip.files){
zipFileNames.push(zipfileName);
if(zipfileName == 'index.html'){
var file = zip.files[zipfileName];
var data = file.data;
document.getElementById('contentdiv').innerHTML = data;
//var data = JSZipBase64.encode(file.data);
}
}
In controller --
public String contentAsText {get;set;}
List<Attachment> atts = [Select Id, Body from Attachment where name='files.zip' limit 1];
contentAsText = EncodingUtil.base64Encode(atts[0].Body);
This link will help you --
http://andyinthecloud.com/2012/12/09/handling-office-files-and-zip-files-in-apex-part-2/