JavaBean和Map转换封装类

package com.ljq.util;import java.beans.BeanInfo;import java.beans.Introspector;import java.beans.PropertyDescriptor;import java.lang.reflect.Method;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Map工具类 * * @author jqlin */public class MapUtils {    /**     * 从map集合中获取属性值     *      * @param <E>     * @param map     *            map集合     * @param key     *            键对     * @param defaultValue     *            默认值     * @return     * @author jiqinlin     */    @SuppressWarnings({ "unchecked", "rawtypes" })    public final static <E> E get(Map map, Object key, E defaultValue) {        Object o = map.get(key);        if (o == null)            return defaultValue;        return (E) o;    }        /**     * Map集合对象转化成 JavaBean集合对象     *      * @param javaBean JavaBean实例对象     * @param mapList Map数据集对象     * @return     * @author jqlin     */    @SuppressWarnings({ "rawtypes" })    public static <T> List<T> map2Java(T javaBean, List<Map> mapList) {        if(mapList == null || mapList.isEmpty()){            return null;        }        List<T> objectList = new ArrayList<T>();                T object = null;        for(Map map : mapList){            if(map != null){                object = map2Java(javaBean, map);                objectList.add(object);            }        }                return objectList;            }        /**     * Map对象转化成 JavaBean对象     *      * @param javaBean JavaBean实例对象     * @param map Map对象     * @return     * @author jqlin     */    @SuppressWarnings({ "rawtypes","unchecked", "hiding" })    public static <T> T map2Java(T javaBean, Map map) {        try {            // 获取javaBean属性            BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass());            // 创建 JavaBean 对象            Object obj = javaBean.getClass().newInstance();            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();            if (propertyDescriptors != null && propertyDescriptors.length > 0) {                String propertyName = null; // javaBean属性名                Object propertyValue = null; // javaBean属性值                for (PropertyDescriptor pd : propertyDescriptors) {                    propertyName = pd.getName();                    if (map.containsKey(propertyName)) {                        propertyValue = map.get(propertyName);                        pd.getWriteMethod().invoke(obj, new Object[] { propertyValue });                    }                }                return (T) obj;            }        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    /**     * JavaBean对象转化成Map对象     *      * @param javaBean     * @return     * @author jqlin     */    @SuppressWarnings({ "rawtypes", "unchecked" })    public static Map java2Map(Object javaBean) {        Map map = new HashMap();                 try {            // 获取javaBean属性            BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass());            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();            if (propertyDescriptors != null && propertyDescriptors.length > 0) {                String propertyName = null; // javaBean属性名                Object propertyValue = null; // javaBean属性值                for (PropertyDescriptor pd : propertyDescriptors) {                    propertyName = pd.getName();                    if (!propertyName.equals("class")) {                        Method readMethod = pd.getReadMethod();                        propertyValue = readMethod.invoke(javaBean, new Object[0]);                        map.put(propertyName, propertyValue);                    }                }            }                    } catch (Exception e) {            e.printStackTrace();        }                  return map;    } }