java反射复制属性值

/** 将sourceObj的属性拷贝到targetObj 
     * @param sourceObj 
     * @param targetObj 
     * @param clazz 从哪一个类开始(比如sourceObj对象层级为:Object->User->ChineseUser->ChineseMan->ChineseChongQingMan) 
     * 如果需要从ChineseUser开始复制，clazz就指定为ChineseUser.class 
     */  
    public static void cpoyObjAttr(Object sourceObj, Object targetObj, Class<?> clazz)throws Exception
    {  
        if(sourceObj==null || targetObj==null)
        {  
            throw new Exception("源对象和目标对象不能为null");  
        }  
        Field[] fields=clazz.getDeclaredFields();  
        for(int i = 0; i < fields.length; i++)
        {
            //System.out.println(fields[i].getName());
            //Object sourceValue=fields[i].get(sourceObj);  
            
            Method getMethod = sourceObj.getClass().getMethod("get" + fields[i].getName());
            Object sourceValue = (Object) getMethod.invoke(sourceObj, null);
            if(null==sourceValue)
            {
                sourceValue = null;
            }            
            fields[i].setAccessible(true);          
            fields[i].set(targetObj,sourceValue);
           
//            System.out.println(fields[i].getName()+";"+clazz+";"+fields[i].getType());            
//            Method setMethod = targetObj.getClass().getMethod("set" +fields[i].getName(), fields[i].getType());
//            setMethod.invoke(targetObj, sourceValue.toString());
        }  
        if(clazz.getSuperclass()==Object.class){  
            return;  
        }         
        cpoyObjAttr(sourceObj,targetObj,clazz.getSuperclass());             
    }