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Apache Commons BeanUtils provides an easy-to-use but flexible wrapper around reflection and introspection.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.beanutils2.converters;

import java.io.File;

/**
 * {@link org.apache.commons.beanutils2.Converter} implementation that handles conversion
 * to and from java.io.File objects.
 * 
 * Can be configured to either return a default value or throw a
 * {@code ConversionException} if a conversion error occurs.
 *
 * @since 1.6
 */
public final class FileConverter extends AbstractConverter {

    /**
     * Constructs a java.io.File Converter that throws
     * a {@code ConversionException} if an error occurs.
     */
    public FileConverter() {
    }

    /**
     * Constructs a java.io.File Converter that returns
     * a default value if an error occurs.
     *
     * @param defaultValue The default value to be returned
     * if the value to be converted is missing or an error
     * occurs converting the value.
     */
    public FileConverter(final Object defaultValue) {
        super(defaultValue);
    }

    /**
     * Gets the default type this {@code Converter} handles.
     *
     * @return The default type this {@code Converter} handles.
     * @since 1.8.0
     */
    @Override
    protected Class getDefaultType() {
        return File.class;
    }

    /**
     * 
Converts the input object into a java.io.File.
     *
     * @param  The target type of the conversion.
     * @param type Data type to which this value should be converted.
     * @param value The input value to be converted.
     * @return The converted value.
     * @throws Throwable if an error occurs converting to the specified type
     * @since 1.8.0
     */
    @Override
    protected  T convertToType(final Class type, final Object value) throws Throwable {
        if (File.class.equals(type)) {
            return type.cast(new File(value.toString()));
        }

        throw conversionException(type, value);
    }
}