获取私有字段值。

/**
来 自 nowjava.com - 时  代  Java
**/

/*

 * Copyright (c) 2005-2016 Vincent Vandenschrick. All rights reserved.

 *

 *  This file is part of the Jspresso framework.

 *

 *  Jspresso is free software: you can redistribute it and/or modify

 *  it under the terms of the GNU Lesser General Public License as published by

 *  the Free Software Foundation, either version 3 of the License, or

 *  (at your option) any later version.

 *

 *  Jspresso 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 Lesser General Public License for more details.

 *

 *  You should have received a copy of the GNU Lesser General Public License

 *  along with Jspresso.  If not, see <http://www.gnu.org/licenses/>.

 */

//package com.nowjava;

import java.lang.reflect.Field;


public class Main {

    /**

     * Gets a private field value.

     *

     * @param clazz

     *          the class declaring the private field.

     * @param fieldName

     *          the field name.

     * @param target

     *          the target object

     * @return the private field value or null if not found.

     * @throws IllegalAccessException

     *           if accessibility context prevents from accessing the field.

     * @throws NoSuchFieldException

     *           if the field does not exist.

     */

    public static Object getPrivateFieldValue(Class<?> clazz,