调用属性的公共获取者

/*

 * Copyright (c) 2012 Data Harmonisation Panel

 * 

 * All rights reserved. This program and the accompanying materials are made

 * available 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.

 * 

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

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

 * 

 * Contributors:

 *     HUMBOLDT EU Integrated Project #030962

 *     Data Harmonisation Panel <http://www.dhpanel.eu>

 */

import java.io.File;//n o w    j a v a  . c o m 提供

import java.io.IOException;

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

import java.net.JarURLConnection;

import java.net.MalformedURLException;

import java.net.URI;

import java.net.URISyntaxException;

import java.net.URL;

import java.util.ArrayList;/* 来 自 时 代 J a v a - nowjava.com*/

import java.util.Collection;

import java.util.Enumeration;

import java.util.Iterator;

import java.util.List;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import java.util.zip.ZipException;


public class Main{

    /**

     * Invokes a public getter for a property

     * 

     * @param <T> the result type

     * @param bean the object to invoke the public getter on

     * @param propertyName the name of the property to retrieve

     * @return the property's value

     * @throws IllegalArgumentException if the argument's type is invalid

     * @throws IllegalAccessException if the getter is not accessible

     * @throws InvocationTargetException if the getter throws an exception

     * @throws NoSuchMethodException if there is no getter for this property

     */

    public static <T> T getProperty(Object bean, String propertyName)

            throws IllegalArgumentException, IllegalAccessException,

            InvocationTargetException, NoSuchMethodException {

        Method getter = findGetter(bean.getClass(), propertyName,

                Object.class);

        if (getter == null) {

            throw new NoSuchMethodException("There is " + //$NON-NLS-1$

                    "no getter for property " + propertyName); //$NON-NLS-1$

        }


        return ReflectionHelper.<T> invokeGetter(bean, getter);

    }

    /**

     * Returns a public getter method for a given property

     * 

     * @param c the class which would contain the getter method

     * @param property the property

     * @param propertyType the property's type

     * @return the public getter or null if there is no getter for this property

     */

    public static Method findGetter(Class<?> c, String property,

            Class<?> propertyType) {

        char[] propertyNameArr = property.toCharArray();

        propertyNameArr[0] = Character.toUpperCase(propertyNameArr[0]);

        String getterName = "get" + new String(propertyNameArr); //$NON-NLS-1$


        Method result = null;

        Method[] methods = c.getMethods();

        for (Method m : methods) {

            if (m.getName().equals(getterName)

                    && m.getParameterTypes().length == 0

                    && (propertyType == null || propertyType

                            .isAssignableFrom(m.getReturnType()))) {

                result = m;

                break;

            }

        }


        return result;

    }