用过第二种,不错,但是尤其注意,因为这是实体与map的转换,如果实体没有的字段,转成map之后是不会有相应的字段的,只能手动set了
/**
*/
class A {
public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null )
return null ;
Object obj = beanClass.newInstance();
org.apache.commons.beanutils.BeanUtils.populate(obj, map);
return obj;
}
public static Map<?, ?> objectToMap(Object obj) {
if (obj == null )
return null ;
return new org.apache.commons.beanutils.BeanMap(obj);
}
}
/**
* 使用Introspector进行转换
*/
class B {
public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null )
return null ;
Object obj = beanClass.newInstance();
BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
Method setter = property.getWriteMethod();
if (setter != null ) {
setter.invoke(obj, map.get(property.getName()));
}
}
return obj;
}
public static Map<String, Object> objectToMap(Object obj) throws Exception {
if (obj == null )
return null ;
Map<String, Object> map = new HashMap<String, Object>();
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();
Object value = getter!= null ? getter.invoke(obj) : null ;
map.put(key, value);
}
return map;
}
}
/**
* 使用reflect进行转换
*/
class C {
public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null )
return null ;
Object obj = beanClass.newInstance();
Field[] fields = obj.getClass().getDeclaredFields();
for (Field field : fields) {
int mod = field.getModifiers();
if (Modifier.isStatic(mod) || Modifier.isFinal(mod)){
continue ;
}
field.setAccessible( true );
field.set(obj, map.get(field.getName()));
}
return obj;
}
public static Map<String, Object> objectToMap(Object obj) throws Exception {
if (obj == null ){
return null ;
}
Map<String, Object> map = new HashMap<String, Object>();
Field[] declaredFields = obj.getClass().getDeclaredFields();
for (Field field : declaredFields) {
field.setAccessible( true );
map.put(field.getName(), field.get(obj));
}
return map;
}
}