File Upload

File: UploadController.java.  This servlet performs a Spring Upload and contains the code to do this operation.

package org.springframework.web.portlet.sample;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.PortletException;
import javax.portlet.PortletRequest;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;

import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor;
import org.springframework.web.portlet.ModelAndView;
import org.springframework.web.portlet.bind.PortletRequestDataBinder;
import org.springframework.web.portlet.multipart.MultipartActionRequest;
import org.springframework.web.portlet.mvc.SimpleFormController;


public class UploadController extends SimpleFormController {

    public void onSubmitAction(ActionRequest request, ActionResponse response,
            Object command, BindException errors) throws Exception {

        if (request instanceof MultipartActionRequest) {
            MultipartActionRequest multipartRequest = (MultipartActionRequest) request;
            MultipartFile multipartFile = multipartRequest.getFile("file");
            if (multipartFile != null) {
                logger.info("isEmpty: " + multipartFile.isEmpty());
                logger.info("contentType: " + multipartFile.getContentType());
                logger.info("name: " + multipartFile.getName());
                logger.info("size: " + multipartFile.getSize());
                logger.info("originalFilename: " + multipartFile.getOriginalFilename());
                if (!"text/plain".equals(multipartFile.getContentType())) {
                    throw new PortletException("File is of type '" +
                            multipartFile.getContentType() +
                            "', not 'text/plain'");
                }
                logger.info("content: " + multipartFile.getBytes().toString());
            } else {
                logger.info("MultipartFile returned NULL");
            }
        }

        Upload upload = (Upload)command;
        if (upload != null) {
            byte[] file = upload.getFile();
            if (file != null) {
                String uploadString = new String(file);
                response.setRenderParameter("upload",uploadString);
            }
        }
    }

    protected ModelAndView onSubmitRender(RenderRequest request, RenderResponse response,
            Object command, BindException errors) throws Exception {
        return this.showNewForm(request, response);
    }

    protected void initBinder(PortletRequest request, PortletRequestDataBinder binder) throws Exception {
        binder.registerCustomEditor(byte[].class, new ByteArrayMultipartFileEditor());
        //binder.registerCustomEditor(String.class, new StringMultipartFileEditor());
    }

}

This file provides an interface to the upload operation

package org.springframework.web.portlet.sample;

import java.io.Serializable;

public class Upload implements Serializable {

    private static final long serialVersionUID = 1L;

    private byte[] file;

        public Upload() {
        super();
    }

        public Upload(byte[] file) {
        super();
        setFile(file);
    }

    public void setFile(byte[] file) {
        this.file = file;
    }

    public byte[] getFile() {
        return file;
    }

}

Here is the jsp which makes the call to the upload code.

<%@ include file="/WEB-INF/jsp/include.jsp" %>
<portlet:defineObjects/>

<h1>File Upload</h1>

<p> Please upload a small text file (under 2KB) and the contents will be displayed back to you.</p>

<form method="post" action="<portlet:actionURL/>" enctype="multipart/form-data">
        <input type="file" name="file"/><br/>
        <button type="submit">Go</button>
</form>

<p>Content:</p>
<pre>${fn:escapeXml(param["upload"])}</pre>