引用的包為java.beans.Introspector
遍歷物件屬性，並獲取其中的值Utils.covertValue(test, Map.class);為公共類

//propertyDesc[i].getName()名字, propertyDesc[i].getPropertyType()型別
public void getTest(){
        //例項化一個類（其中有個class屬性）
        People people= new People();
        people.setId("123");
        people.setAppId("123");
    try
 
 {
        People test = mongoFileManager.getTest("7897897891");
        Map covertValue = Utils.covertValue(test, Map.class);
        //開始迭代屬性
        BeanInfo beanInfo = Introspector.getBeanInfo(People.class);
        PropertyDescriptor[] propertyDesc = beanInfo.getPropertyDescriptors();
        //迴圈展示（超類中有個class屬性要略過）
 

        for (PropertyDescriptor propertyDescriptor : propertyDesc) {
            if (propertyDesc[i].getName().
                compareToIgnoreCase("class") == 0)             
                continue;
              System.out.println(propertyDescriptor.getName()+"----"
              +covertValue.get
 
(propertyDescriptor.getName()));
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

轉化類引入包
com.fasterxml.jackson.databind.ObjectMapper

private static ObjectMapper mapper = new ObjectMapper();
public static <T> T covertValue(Object value, Class<T> toType) {
    return mapper.convertValue(value, toType);
}