transfer between javabean and map

1. java bean 转化成 map

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

public class BeanToMap {

    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();  

                // 过滤class属性
                if (!key.equals("class")) {
                    // 得到property对应的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;
    }  

}

2. map transfer javabean

2.1 (使用工具类BeanUtils)

import org.apache.commons.beanutils.BeanUtils

public static void transMap2Bean(Object obj, Map map){
        if(obj==null || map==null){
            return ;
        }
        try {
            BeanUtils.populate(obj, map);
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

2.2 利用java内省

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对应的setter方法
                    Method setter = property.getWriteMethod();
                    setter.invoke(obj, value);
                }  

            }  

        } catch (Exception e) {
            System.out.println("transMap2Bean Error " + e);
        }  

        return;  

    }