JavaBean與map之間的相互轉換

javabean對象和map之間的轉換

import org.springframework.cglib.beans.BeanMap;

public class BeanUtils {

    /**
     * 將對象轉換爲map
     *
     * @param bean
     * @return
     */
    public static <T> Map<String, Object> beanToMap(T bean) {
        Map<String, Object> map = Maps.newHashMap();
        if (bean != null) {
            BeanMap beanMap = BeanMap.create(bean);
            for (Object key : beanMap.keySet()) {
                map.put(key.toString(), beanMap.get(key));
            }
        }
        return map;
    }
 /**
   * 利用Introspector和PropertyDescriptor實現JavaBean轉Map
   */ 
    public static Map<String, Object> transBean2Map(Object obj) {

        if(obj == null){
            return null;
        }        
        Map<String, Object> map = new HashMap<String, Object>();
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
 
                // 過濾class屬性
                if (!key.equals("class")) {
                    // 得到property對應的getter方法
                    Method getter = property.getReadMethod();
                    Object value = getter.invoke(obj);
 
                    map.put(key, value);
                }
            }
        } catch (Exception e) {
            System.out.println("transBean2Map Error " + e);
        }
 
        return map;
 
    }

Map和javabean對象之間的轉換

import org.springframework.cglib.beans.BeanMap; 
   /**
     * 將map轉換爲javabean對象
     *
     * @param map
     * @param bean
     * @return
     */
    public static <T> T mapToBean(Map<String, Object> map, T bean) {
        BeanMap beanMap = BeanMap.create(bean);
        beanMap.putAll(map);
        return bean;
    }
}
   /**
     * 利用org.apache.commons.beanutils 工具類實現 Map 轉JavaBean
     *@param map 
     *@param obj 
     */
public static void transMap2Bean2(Map<String, Object> map, Object obj) {
        if (map == null || obj == null) {
            return;
        }
        try {
            BeanUtils.populate(obj, map);
        } catch (Exception e) {
            System.out.println("transMap2Bean2 Error " + e);
        }
    }
 
   /**
     * 利用Introspector,PropertyDescriptor實現 Map 轉JavaBean
     *@param map 
     *@param obj 
     */
    public static void transMap2Bean(Map<String, Object> map, Object obj) {
 
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
 
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
 
                if (map.containsKey(key)) {
                    Object value = map.get(key);
                    // 得到property對應的setter方法
                    Method setter = property.getWriteMethod();
                    setter.invoke(obj, value);
                }
 
            }
 
        } catch (Exception e) {
            System.out.println("transMap2Bean Error " + e);
        }
 
        return;
 
    }

注意：Map轉JavaBean的方法可能會出現數據類型轉換問題。