Map<String, Object> fieldMap =new HashMap<String, Object>();

BeanInfo beanInfo = Introspector.getBeanInfo(【javabean类名】.class, Object.class);

//获取所有的属性描述器

PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();

for(PropertyDescriptor pd:pds){

String key = pd.getName();

Method getter = pd.getReadMethod();

Object value = getter.invoke(【实例化的javaBean】);

fieldMap.put(key, value);

}