Java - Introspector Examples

package com.logicbig.example;

import java.beans.*;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;


public class IntrospectorExample {

    public static void main (String[] args) throws IntrospectionException, IOException,
                        ClassNotFoundException, InvocationTargetException, IllegalAccessException {

        //introspecting the details of a target bean
        BeanInfo beanInfo = Introspector.getBeanInfo(TheBean.class);

        //creating an instance of the bean
        TheBean instance = (TheBean) Beans.instantiate(
                            IntrospectorExample.class.getClassLoader(),
                            beanInfo.getBeanDescriptor()
                                    .getBeanClass()
                                    .getName());

        System.out.println("The instance created : " + instance);

        BeanDescriptor bd = beanInfo.getBeanDescriptor();
        System.out.println("Bean name: " + bd.getName());
        System.out.println("Bean display name: " + bd.getDisplayName());
        System.out.println("Bean class: " + bd.getBeanClass());

        for (PropertyDescriptor pd : beanInfo.getPropertyDescriptors()) {
            System.out.println("----------");
            System.out.println("Property Name: " + pd.getName());
            System.out.println("Property Display Name:" + pd.getDisplayName());
            System.out.println("Property Type: " + pd.getPropertyType());

            if (pd.getPropertyType()
                  .isAssignableFrom(java.lang.String.class)) {
                System.out.println("Property value: " + pd.getReadMethod()
                                                          .invoke(instance));
                pd.getWriteMethod()
                  .invoke(instance, "a string value set");
                System.out.println("Property value after setting: " + pd.getReadMethod()
                                                                        .invoke(instance));
            }
        }

        //similarly we can analyse bean's method, event etc..
    }

    public static class TheBean {
        private String someStr;

        public String getSomeStr () {
            return someStr;
        }

        public void setSomeStr (String someStr) {
            this.someStr = someStr;
        }

    }
}