8. Object转Map，Map转Object

   法一：使用reflect进行转换

public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {    
    if (map == null)  
        return null;    

    Object obj = beanClass.newInstance();  
    Field[] fields = obj.getClass().getDeclaredFields();   
    for (Field field : fields) {    
        int mod = field.getModifiers();    
        if(Modifier.isStatic(mod) || Modifier.isFinal(mod)){    
            continue;    
        }    
        field.setAccessible(true);    
        field.set(obj, map.get(field.getName()));   
    }   

    return obj;    
}    
  
public static Map<String, Object> objectToMap(Object obj) throws Exception {    
    if(obj == null){    
        return null;    
    }   
  
    Map<String, Object> map = new HashMap<String, Object>();    
  
    Field[] declaredFields = obj.getClass().getDeclaredFields();    
    for (Field field : declaredFields) {    
        field.setAccessible(true);  
        map.put(field.getName(), field.get(obj));  
    }    
  
    return map;  
}   


法二：使用Introspector进行转换

public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {    
    if (map == null)   
        return null;    
 
    Object obj = beanClass.newInstance();  
  
    BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());    
    PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();    
    for (PropertyDescriptor property : propertyDescriptors) {  
        Method setter = property.getWriteMethod();    
        if (setter != null) {  
            setter.invoke(obj, map.get(property.getName()));   
        }  
    }  
  
    return obj;  
}    
      
public static Map<String, Object> objectToMap(Object obj) throws Exception {    
    if(obj == null)  
        return null;      
  
    Map<String, Object> map = new HashMap<String, Object>();   
  
    BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());    
    PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();    
    for (PropertyDescriptor property : propertyDescriptors) {    
        String key = property.getName();    
        if (key.compareToIgnoreCase("class") == 0) {   
            continue;  
        }  
        Method getter = property.getReadMethod();  
        Object value = getter!=null ? getter.invoke(obj) : null;  
        map.put(key, value);  
    }    
  
    return map;  
}