RefleTool.java

/*
 * Copyright 2015-2016 Dark Phoenixs (Open-Source Organization).
 *
 * Licensed 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.darkphoenixs.mq.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;

/**
 * <p>Title: RefleTool</p>
 * <p>Description: 反射工具类</p>
 *
 * @author Victor.Zxy
 * @version 1.0
 * @since 2015-06-01
 */
public class RefleTool {

    /**
     * <p>Title: newInstance</p>
     * <p>Description: 反射机制实例化对象</p>
     *
     * @param objClass 要实例化的类类型
     * @param params   构造方法参数
     * @return 实例化对象
     */
    public static <T> T newInstance(Class<T> objClass, Object... params) {

        T t = null;

        Class<?>[] paramTypes = new Class<?>[params.length];

        for (int i = 0; i < params.length; i++)

            paramTypes[i] = params[i].getClass();

        try {
            Constructor<T> constructor = objClass.getConstructor(paramTypes);

            t = constructor.newInstance(params);

        } catch (Exception e) {
            e.printStackTrace();
        }

        return t;
    }

    /**
     * <p>Title: getFieldValue</p>
     * <p>Description: 反射机制获取属性值</p>
     *
     * @param obj
     * @param fieldName
     * @param fieldType
     * @return 属性值
     */
    @SuppressWarnings("unchecked")
    public static <T> T getFieldValue(Object obj, String fieldName, Class<T> fieldType) {

        Class<?> clasz = obj.getClass();

        for (; clasz != Object.class; clasz = clasz.getSuperclass()) {

            try {
                Field field = clasz.getDeclaredField(fieldName);

                field.setAccessible(true);

                return (T) field.get(obj);

            } catch (Exception e) {

            }
        }

        return null;
    }
}