java 使用BeanInfo实现bean实体与map之间的互相转换
java 使用BeanInfo实现bean实体与map之间的互相转换。
public interface BeanInfo希望提供有关其 bean 的显式信息的 bean 实现者可以提供某个 BeanInfo 类,该类实现此 BeanInfo 接口并提供有关其 bean 的方法、属性、事件等显式信息。
mport java.beans.BeanInfo; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import com.bh.bean.User; public class Test { /** * bean转map */ public Test() { try { Map<String, Object> user=beanTransformToMap(new User(1, "zs")); Iterator<Entry<String, Object>> iterator = user.entrySet().iterator(); while(iterator.hasNext()){ Entry<String, Object> next = iterator.next(); System.out.println(next.getKey()+" "+next.getValue()); } } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | IntrospectionException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /**map转实体 * @param map * @return * @throws IllegalAccessException * @throws IllegalArgumentException * @throws InvocationTargetException * @throws IntrospectionException */ private User mapTransformToBean(Map<String, Object> map) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, IntrospectionException{ User user=new User(); BeanInfo beanInfo = Introspector.getBeanInfo(user.getClass()); PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); for (PropertyDescriptor property : propertyDescriptors) { String key = property.getName(); if (map.containsKey(key)) { Object value = map.get(key); //得到property对应的setter方法 Method setter = property.getWriteMethod(); setter.invoke(user, value); } } return user; } /**实体转map * @param user * @return * @throws IllegalAccessException * @throws IllegalArgumentException * @throws InvocationTargetException * @throws IntrospectionException */ private Map<String, Object> beanTransformToMap(User user) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, IntrospectionException{ Map<String, Object> map = new HashMap<String, Object>(); BeanInfo beanInfo = Introspector.getBeanInfo(user.getClass()); PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); for (PropertyDescriptor property : propertyDescriptors) { String key = property.getName(); // 过滤class属性 if (!key.equals("class")) { // 得到property对应的getter方法 Method getter = property.getReadMethod(); Object value = getter.invoke(user); map.put(key, value); } } return map; } public static void main(String[] args) { new Test(); } }