Java中Map与JavaBean之间的相互转化

有的时候 我们想将一个JavaBean 转换成 Map，或者反之。

那么就使用下面的转化工具吧！

 

package com.jiuzi;

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 BeanUtils {
	/**
	 * 将一个 JavaBean 对象转化为一个  Map
	 * @param bean 要转化的JavaBean 对象
	 * @return  转化出来的  Map 对象
	 * @throws IntrospectionException
	 * @throws IllegalAccessException
	 * @throws IllegalArgumentException
	 * @throws InvocationTargetException
	 */
	public static Map<String, Object> convertBeanToMap(Object bean) throws IntrospectionException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		Class<?> type = bean.getClass();
		Map<String, Object> returnMap = new HashMap<String, Object>();

		BeanInfo beanInfo = Introspector.getBeanInfo(type);
		PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

		for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
			String propertyName = propertyDescriptor.getName();

			if (!"class".equals(propertyName)) {
				Method readMethod = propertyDescriptor.getReadMethod();
				Object result = readMethod.invoke(bean, new Object[0]);
				if (null != result) {
					returnMap.put(propertyName, result);
				} else {
					returnMap.put(propertyName, "");
				}
			}
		}
		return returnMap;
	}
	
	/**
	 * 将一个map对象转化为JavaBean
	 * @param type  要转化的类型
	 * @param map 包含属性值的 map
	 * @return 转化出来的 JavaBean 对象
	 * @throws IntrospectionException 
	 * @throws InstantiationException 
	 * @throws IllegalAccessException 
	 * @throws IllegalArgumentException
	 * @throws InvocationTargetException
	 */
	public static Object convertMapToBean(Class<?> type,Map<String, Object> map) throws IntrospectionException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{
		BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性
		Object obj = type.newInstance(); // 创建 JavaBean 对象
		PropertyDescriptor[] propertyDescriptors =  beanInfo.getPropertyDescriptors();  
		for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
			String propertyName = propertyDescriptor.getName();  
			
			if (map.containsKey(propertyName)) {
				try {
					Object value = map.get(propertyName);
					Object[] args = new Object[]{value};
					propertyDescriptor.getWriteMethod().invoke(obj, args);
				} catch (Exception e) {
					System.err.println("The failure of "+propertyName+" assignment");
				}
				
			}
			
		}
		return obj;
	}
}