transfer between javabean and map，transferjavabean

transfer between javabean and map，transferjavabean

1. java bean 轉化成 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();  
  
                // 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;  
    }  
    
}

2. map transfer javabean

  2.1 (使用工具類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內省

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對應的setter方法  
                    Method setter = property.getWriteMethod();  
                    setter.invoke(obj, value);  
                }  
  
            }  
  
        } catch (Exception e) {  
            System.out.println("transMap2Bean Error " + e);  
        }  
  
        return;  
  
    }