JavaBean和Map相互转换

你的名字 2022-05-11 05:52 258阅读 0赞

## Jdk bean转map ##

import java.beans.BeanInfo;
    import java.beans.IntrospectionException;
    import java.beans.Introspector;
    import java.beans.PropertyDescriptor;
    import java.beans.Transient;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    import java.util.HashMap;
    import java.util.Map;
    
    public class Tools { 
    
        public static Map<String, Object> beanToMap(Object obj) { 
            try { 
                Map<String, Object> map = new HashMap();
                BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
                PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
                for (PropertyDescriptor property : propertyDescriptors) { 
                    String key = property.getName();
                    if (key.compareToIgnoreCase("class") == 0) { 
                        continue;
                    }
                    Method getter = property.getReadMethod();
                    Transient annotation = getter.getAnnotation(Transient.class);
                    if (annotation == null) { 
                        Object value = getter != null ? getter.invoke(obj) : null;
                        map.put(key, value);
                    }
                }
                return map;
            } catch (IntrospectionException | IllegalAccessException | InvocationTargetException e) { 
                throw new IllegalArgumentException(e.getMessage());
            }
        }
    }

## apache bean和map互转 ##

import org.apache.commons.beanutils.BeanUtils;
    
    private Map beanToMap(Object obj) { 
    	try { 
    		return BeanUtils.describe(obj);
    	} catch (IllegalAccessException | InvocationTargetException
    			| NoSuchMethodException e) { 
    		e.printStackTrace();
    	}
    	return null;
    }
    
    private List<?> mapToBean(List<Map<String, Object>> data, Class<?> clazz) { 
    	List<Object> list = new ArrayList<>();
    	try { 
    		for (int i = 0; i < data.size(); i++) { 
    			Object newInstance = clazz.newInstance();
    			Map<String, Object> map = data.get(i);
    			BeanUtils.populate(newInstance, map);
    			list.add(newInstance);
    		}
    		return list;
    	} catch (Exception e) { 
    	}
    	return null;
    }