利用反射改变私有属性的值

 

package org.fanzone.lang.reflect;

 

import java.io.Serializable;

import java.lang.reflect.Field;

 

/**

* Title: JavaTech<br>

* Description: Change the value of the private member of a specified class.<br>

* Copyright: Copyright (c) 2011 <br>

* Create DateTime: Jul 12, 2011 2:23:05 PM <br>

* @author wangmeng

*/

public class ChangePrivatePropertyValue {

 

/**

* A inner class as a bean.

*/

class Person implements Serializable{

private static final long serialVersionUID = 8875435845244822261L;

private String corporeity;

private String spirit;

public String getCorporeity() {

return corporeity;

}

public void setCorporeity(String corporeity) {

this.corporeity = corporeity;

}

public String getSpirit() {

return spirit;

}

public void setSpirit(String spirit) {

this.spirit = spirit;

}

}

/**

* Change the value of the specified property.

* @param obj

* @param property

* @param value

*/

public static void changeValue(Object obj, String property, Object value){

Field field = null;

try {

//Get the specified declared field.

field = obj.getClass().getDeclaredField(property);

//Open the accessible socket. 

field.setAccessible(true);

//Inject the new value.

field.set(obj, value);

} catch (SecurityException e) {

e.printStackTrace();

} catch (NoSuchFieldException e) {

e.printStackTrace();

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

}

 

public static void main(String[] args){

Person meng = new ChangePrivatePropertyValue().new Person();

meng.setCorporeity("man");

meng.setSpirit("woman");

System.out.println("Meng is a person who owns " + meng.getCorporeity() + " corporeity and " + meng.getSpirit() + " spirit.");

changeValue(meng, "spirit", "man");

System.out.println("But now, he get the " + meng.getSpirit() + " spirit at last...(^_^)");

 

}

}