InputFile1Validator.java

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package com.sun.faces.test.servlet30.facelets;

import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.FacesValidator;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import javax.servlet.http.Part;

@FacesValidator(value="InputFile1Validator")
public class InputFile1Validator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        Part file = (Part) value;
        
        try {
            InputStream is = file.getInputStream();
            String text = new Scanner( is ).useDelimiter("\\A").next();
            // Do not accept an upload unless it contains the string
            // JSR-344
            if (!text.contains("JSR-344")) {
                throw new ValidatorException(new FacesMessage("Invalid file.  File must contain the string JSR-344"));
            }
        } catch (IOException ex) {
            throw new ValidatorException(new FacesMessage("Invalid file"), ex);
        } catch (ValidatorException ex) {
            throw new ValidatorException(new FacesMessage("Invalid file"), ex);
        }   
    }
}