ValidatedFileUploadBean.java

/*
 * Copyright (C) 2013 Martin Fousek & Mert Caliskan
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package javaone.con3638.fileupload;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import javax.inject.Named;
import javax.enterprise.context.RequestScoped;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.ValidatorException;
import javax.servlet.http.Part;


@Named(value = "validatedFileUploadBean")
@RequestScoped
public class ValidatedFileUploadBean {

    private Part file;

    public Part getFile() {
        return file;
    }

    public void setFile(Part file) {
        this.file = file;
    }

    public void validateFile(FacesContext ctx, UIComponent comp, Object value) {
        List<FacesMessage> msgs = new ArrayList<>();
        Part file = (Part) value;

        if (file.getSize() > 1024) {
          msgs.add(new FacesMessage("file is too big dude!"));
        }

        if (!msgs.isEmpty()) {
          throw new ValidatorException(msgs);
        }
    }    
    
    public void upload() {
        try {
          String fileContent = new Scanner(file.getInputStream()).next();
          // do some crazy stuff on content
        } 
        catch (IOException e) {
            System.err.print(e);
        }
    }
}