get Java Bean Simple Property - Java Reflection

Java examples for Reflection:Java Bean

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Description

get Java Bean Simple Property

Demo Code


//package com.java2s;
import java.beans.BeanInfo;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {
    public static Object getSimpleProperty(Object bean, String name)
            throws IllegalArgumentException, IllegalAccessException,
            InvocationTargetException {
        Method readMethod = getSimplePropertyReadMethod(bean, name);
        if (readMethod == null)
            throw new IllegalArgumentException(
                    "No readMethod for property:" + name);
        readMethod.setAccessible(true);//from w  ww .  j a  v  a2  s . c o  m
        Object value = readMethod.invoke(bean, new Object[0]);
        return value;
    }

    public static Method getSimplePropertyReadMethod(Object bean,
            String name) {
        PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean,
                name);
        if (propertyDescriptor == null)
            throw new IllegalArgumentException("No property:" + name);
        return propertyDescriptor.getReadMethod();
    }

    public static PropertyDescriptor getPropertyDescriptor(Object bean,
            String name) {
        PropertyDescriptor[] descriptors = getPropertyDescriptors(bean);
        for (int i = 0; i < descriptors.length; i++) {
            if (name.equals(descriptors[i].getName()))
                return descriptors[i];
        }
        return null;
    }

    public static PropertyDescriptor[] getPropertyDescriptors(Object bean) {
        BeanInfo beanInfo = null;
        try {
            beanInfo = Introspector.getBeanInfo(bean.getClass());
        } catch (IntrospectionException e) {
            return (new PropertyDescriptor[0]);
        }
        PropertyDescriptor[] descriptors = beanInfo
                .getPropertyDescriptors();
        return descriptors;
    }
}

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