将POJO转换为<K,V>地图

Question

可能重复:
如何将Java对象(bean)转换为键值对(反之亦然)？

转换a的最佳方法List<POJO> to a List<Map<K,V>>. 是什么？是否有自定义方法/ API？

K = POJO的字段名称,V是对应的值

public class POJO implements Serializable{

String name;
String age;
//getters and setters
}

Answer 1

对于好的和旧的Introspector来说,这听起来像是一份工作.

工作范例:

// Don't be lazy like this, do something about the exceptions
public static void main(String[] args) throws Exception {
    List<POJO> pojos = new ArrayList<POJO>();
    POJO p1 = new POJO();
    p1.setAge("20");
    p1.setName("Name");
    pojos.add(p1);
    POJO p2 = new POJO();
    // ...
    System.out.println(convertCollection(pojos));
}

public static List<Map<String, ?>> convertCollection(Collection collection) 
        throws Exception {
    List<Map<String, ?>> list = new ArrayList<Map<String, ?>>();
    for (Object element : collection) {
        list.add(getValues(element));
    }
    return list;
}

public static Map<String, ?> getValues(Object o) 
        throws Exception {
    Map<String, Object> values = new HashMap<String, Object>();
    BeanInfo info = Introspector.getBeanInfo(o.getClass());
    for (PropertyDescriptor pd : info.getPropertyDescriptors()) {
        // This will access public properties through getters
        Method getter = pd.getReadMethod();
        if (getter != null)
            values.put(pd.getName(), getter.invoke(o));
    }
    return values;
}

Answer 2

来自Apache Commons的BeanMap完成了这项工作