Java常用对象操作工具代码实例

Java常用对象操作工具代码实例

对象复制(反射法)

public static void copyProp(Object from, Object to, String... filterProp) {

HashSet filterSet = new HashSet(Arrays.asList(filterProp));

Class> fromc = from.getClass();

Class> toc = to.getClass();

List to_fields = new ArrayList() ;

while (toc != null) {

CYuTWSs to_fields.addAll(Arrays.asList(toc.getDeclaredFields()));

toc = toc.getSuperclass();

}

for (Field to_field : to_fields) {

try{

if (filterSet.contains(to_field.getName())||"serialVersionUID".equals(to_field.getName())) {

continue;

}

Field from_field = null;

try{

from_field = fromc.getDeclaredField(to_field.getName());

}catch (Exception e){

continue;

}

from_field.setAccessible(true);

Object value = from_field.get(from);

if(value==null){

continue;

}

to_field.setAccessible(true);

to_field.set(to, value);

}catch (Exception e){

e.printStackTrace();

}

}

}

只copy有值对象

不需要copy的属性用filterProp

是能过反射属性注入方法实现，所有属性的名称类型必须一样

对象复制(fastjson转换)

单个

public static T bean2OtherBean(Object bean, Class tClass){

return JSON.parseObject(JSON.toJSONString(bean),tClass);

}

列表

public static List list2OtherList(List originList, Class tClass){

List list = new ArrayList<>();

if(!CollectionUtils.isEmpty(originList)){

for (Object obj : originList) {

T t = bean2OtherBean(obj,tClass);

list.add(t);

}

}

return list;

}

fastjson实现，属性不一样必须用注解

对象转MAP

public static Map bean2map(Object obj) throws IllegalAccessException {

Map map = new HashMap<>();

Class> clazz = obj.getClass();

for (Field field : clazz.getDeclaredFields()) {

field.setAccessible(true);

String fieldName = field.getName();

Object value = field.get(obj);

map.put(fieldName, value);

}

return (Map) map;

}

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