change a Java Bean to a Map - Java Reflection

Java examples for Reflection:Java Bean

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Description

change a Java Bean to a Map

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;
import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] argv) throws Exception {
        Object bean = "java2s.com";
        System.out.println(convertBean(bean));
    }/*from w  w  w .ja v  a  2s.c o m*/

    /**
     * change a JavaBean to a Map
     *
     */
    public static Map<String, String> convertBean(Object bean)
            throws IntrospectionException, IllegalAccessException,
            InvocationTargetException {
        Class type = bean.getClass();
        Map returnMap = new HashMap();
        BeanInfo beanInfo = Introspector.getBeanInfo(type);

        PropertyDescriptor[] propertyDescriptors = beanInfo
                .getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (!propertyName.equals("class")) {
                Method readMethod = descriptor.getReadMethod();
                if (readMethod == null) {
                    continue;
                }
                Object result = readMethod.invoke(bean, new Object[0]);
                if (result != null) {
                    returnMap.put(propertyName, String.valueOf(result));
                } else {
                    returnMap.put(propertyName, "");
                }
            }
        }
        return returnMap;
    }
}

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