describe Java Bean - Java Reflection

Java examples for Reflection:Java Bean

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Description

describe Java Bean

Demo Code


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;
import java.lang.reflect.Modifier;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main{
    public static void main(String[] argv) throws Exception{
        Object obj = "java2s.com";
        System.out.println(describe(obj));
    }//from w  ww .  ja va  2  s .  c  om
    /**
     * @see #org.apache.commons.beanutils.PropertyUtils.describe(obj)
     */
    public static Map describe(Object obj) {
        if (obj instanceof Map)
            return (Map) obj;
        Map map = new HashMap();
        PropertyDescriptor[] descriptors = getPropertyDescriptors(obj
                .getClass());
        for (int i = 0; i < descriptors.length; i++) {
            String name = descriptors[i].getName();
            Method readMethod = descriptors[i].getReadMethod();
            if (readMethod != null) {
                try {
                    map.put(name, readMethod.invoke(obj, new Object[] {}));
                } catch (Exception e) {
                    GLogger.warn("error get property value,name:" + name
                            + " on bean:" + obj, e);
                }
            }
        }
        return map;
    }
    public static PropertyDescriptor[] getPropertyDescriptors(
            Class beanClass) {
        BeanInfo beanInfo = null;
        try {
            beanInfo = Introspector.getBeanInfo(beanClass);
        } catch (IntrospectionException e) {
            return (new PropertyDescriptor[0]);
        }
        PropertyDescriptor[] descriptors = beanInfo
                .getPropertyDescriptors();
        if (descriptors == null) {
            descriptors = new PropertyDescriptor[0];
        }
        return descriptors;
    }
    public static PropertyDescriptor getPropertyDescriptors(
            Class beanClass, String name) {
        for (PropertyDescriptor pd : getPropertyDescriptors(beanClass)) {
            if (pd.getName().equals(name)) {
                return pd;
            }
        }
        return null;
    }
}

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