Set any bean property - Java Reflection

Java examples for Reflection:Java Bean

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Description

Set any bean property

Demo Code

/*******************************************************************************
 * Copyright (c) 2006 The Regents of the University of California
 * All rights reserved. Permission to use, copy, modify and distribute
 * any part of this software for educational, research and non-profit
 * purposes, without fee, and without a written agreement is hereby
 * granted, provided that the above copyright notice, this paragraph
 * and the following three paragraphs appear in all copies.
 *
 * Those desiring to incorporate this software into commercial products or
 * use for commercial purposes should contact the Technology Transfer &
 * Intellectual Property Services, University of California, San Diego,
 * 9500 Gilman Drive, Mail Code 0910, La Jolla, CA 92093-0910, Ph: (858)
 * 534-5815, FAX: (858) 534-7345, E-MAIL:invent@ucsd.edu.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
 * INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF this software, EVEN IF
 * THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE./*  w  ww  .  j a  va2  s  .c  o  m*/
 *
 * THIS SOFTWARE PROVIDED HEREIN IS ON AN "AS IS" BASIS, AND THE UNIVERSITY
 * OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
 * UPDATES, ENHANCEMENTS, OR MODIFICATIONS. THE UNIVERSITY OF CALIFORNIA
 * MAKES NO REPRESENTATIONS AND EXTENDS NO WARRANTIES OF ANY KIND, EITHER
 * IMPLIED OR EXPRESS, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR
 * THAT THE USE OF THE WILL NOT INFRINGE ANY PATENT, TRADEMARK OR OTHER
 * RIGHTS.
 *
 * Contributors:
 *     San Diego Supercomputer Center - SWAMI Team - initial API and implementation
 *******************************************************************************/
//package com.java2s;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {
    public static void main(String[] argv) throws Exception {
        Object bean = "java2s.com";
        String propertyName = "java2s.com";
        String value = "java2s.com";
        setPropertyFromString(bean, propertyName, value);
    }

    /**
     * Set any bean property
     *
     * @param bean
     * @param propertyName
     * @param value
     * @throws SecurityException
     * @throws NoSuchMethodException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void setPropertyFromString(Object bean,
            String propertyName, String value) throws SecurityException,
            NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        String methodName = getSetterName(propertyName);
        Class<?>[] types = new Class[1];
        types[0] = String.class;
        Method method = getMethod(bean.getClass(), methodName, types);
        method.setAccessible(true);
        method.invoke(bean, value);
    }

    /**
     * returns the method name for the property mutator
     *
     * @param propertyName
     * @return methodName
     */
    public static String getSetterName(String propertyName) {
        return buildMethodName("set", propertyName);
    }

    /**
     *
     * @param beanClass
     * @param methodName
     * @param parameters
     * @return method
     * @throws NoSuchMethodException
     * @throws SecurityException
     */
    private static Method getMethod(Class<?> beanClass, String methodName,
            Class<?>[] types) throws SecurityException,
            NoSuchMethodException {
        return beanClass.getDeclaredMethod(methodName, types);
    }

    /**
     * Switches the first character of the propertyName to upper case and adds
     * the prefix
     *
     * @param propertyName
     * @param prefix
     * @return
     */
    private static String buildMethodName(String prefix, String propertyName) {
        String firstChar = String.valueOf(propertyName.charAt(0));
        String firstCharUpper = firstChar.toUpperCase();
        return prefix
                + propertyName.replaceFirst(firstChar, firstCharUpper);
    }
}

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