Upload / Download Files in Liferay

We already know how to upload file in document and media  portlet. Today we will see how to upload a file in local machine . I created a folder on my desktop with name textdata. When we upload a file it will save in this folder . Here i also check that file must be a text file if you upload a pdf or jpeg it will give error.

So lets start this Step by Step:-

Step 1:-Create a project and portlet

Create a project and then create a portlet in it .Here my project name is upload-download-portlet and portlet name is Demo.

Step 2:-Change the jsp

Change your view.jsp as:-

view.jsp

	<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
	<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
	<portlet:defineObjects />
	<portlet:actionURL var="uplaodURL" name="uploadFile"></portlet:actionURL>
	<portlet:resourceURL var="downloadURL"></portlet:resourceURL>
	<liferay-ui:success key="success" message="File Upload SuccessFully"/>
	<liferay-ui:error key="failure" message="Upload Error" />
	<liferay-ui:error key="file.extension.error" message="Upload only text File" />
	<b>Please Upload a Text Document</b>
	<br><br>
	<form action="<%=uplaodURL%>" method="post" enctype="multipart/form-data">
	<input type="file" name="textFile"/><br><br>
	<input type="Submit" name="Submit"/>
	</form>
	<a href="<%= downloadURL %>">Click Here for Download</a>

view raw view.jsp hosted with ❤ by GitHub

Explanation:-
Here we create two urls :-
1)uploadURL:- Action URL for upload 
2)downloadURL:- Resource URL(Ajax) for Download

Here we also use success and failure messages for Validation.

Step 3:-Change the Controller(Java)

Change the Portlet file as:-

Demo.java

	package com.demo;
	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.nio.file.Files;
	import javax.portlet.ActionRequest;
	import javax.portlet.ActionResponse;
	import javax.portlet.PortletException;
	import javax.portlet.ResourceRequest;
	import javax.portlet.ResourceResponse;
	import org.apache.commons.io.IOUtils;
	import com.liferay.portal.kernel.portlet.LiferayPortletConfig;
	import com.liferay.portal.kernel.servlet.SessionErrors;
	import com.liferay.portal.kernel.servlet.SessionMessages;
	import com.liferay.portal.kernel.upload.UploadPortletRequest;
	import com.liferay.portal.kernel.util.Validator;
	import com.liferay.portal.util.PortalUtil;
	import com.liferay.util.bridges.mvc.MVCPortlet;
	public class Demo extends MVCPortlet {
	public final void uploadFile(final ActionRequest request, final ActionResponse response) {
	SessionMessages.add(request, ((LiferayPortletConfig) getPortletConfig()).getPortletId() + SessionMessages.KEY_SUFFIX_HIDE_DEFAULT_ERROR_MESSAGE);
	final String uploadDirectoryPath = "C:\\Users\\Aditya.bhardwaj\\Desktop\\textdata";
	final UploadPortletRequest uploadPortletRequest = PortalUtil.getUploadPortletRequest(request);
	final File file = uploadPortletRequest.getFile("textFile");
	//String fileName = uploadPortletRequest.getFileName("textFile");
	OutputStream out = null;
	InputStream in = null;
	try {
	final String fileType = Files.probeContentType(file.toPath());
	if (Validator.isNotNull(fileType)) {
	if (fileType.equalsIgnoreCase("text/plain")) {
	in = new FileInputStream(file);
	out = new FileOutputStream(new File(uploadDirectoryPath, "hello.txt"));
	IOUtils.copy(in, out);
	SessionMessages.add(request, "success");
	} else {
	SessionErrors.add(request, "file.extension.error");
	}
	} else {
	SessionErrors.add(request, "failure");
	}
	} catch (final IOException e) {
	SessionErrors.add(request, "failure");
	} finally {
	try {
	if (Validator.isNotNull(out)) {
	out.flush();
	out.close();
	}
	if (Validator.isNotNull(in)) {
	in.close();
	}
	} catch (final IOException e) {
	e.printStackTrace();
	}
	}
	}
	@Override
	public final void serveResource(final ResourceRequest request, final ResourceResponse response) throws IOException, PortletException {
	final String downloadDirectoryPath = "C:\\Users\\Aditya.bhardwaj\\Desktop\\textdata";
	final File outputFile = new File(downloadDirectoryPath, "hello.txt");
	response.setContentType("text/plain");
	response.addProperty("Content-disposition", "atachment; filename=hello.txt");
	OutputStream out = null;
	InputStream in = null;
	try {
	out = response.getPortletOutputStream();
	in = new FileInputStream(outputFile);
	IOUtils.copy(in, out);
	} catch (final IOException e) {
	e.printStackTrace();
	} finally {
	try {
	if (Validator.isNotNull(out)) {
	out.flush();
	out.close();
	}
	if (Validator.isNotNull(in)) {
	in.close();
	}
	} catch (final IOException e) {
	e.printStackTrace();
	}
	}
	}
	}

view raw Demo.java hosted with ❤ by GitHub

Explanation:-
Here i created a folder textData on Desktop where i upload the file. File are save with name hello.txt.

I used IOUtils class which belong to commons-io.jar so add this jar in liferay-plugin-package.properties.

Step 4:-Check the output

Now deploy the portlet and check the output:-


1)If you upload a pdf file:-

2)If you upload a text file:-

You can download the source code from here.

Hope this will Help....

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