Java中如何编写典型对象操作工具的代码示例？

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java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 fields=new ArrayList(); // 获取所有字段，排除过滤字段 for (Field field : fromc.getDeclaredFields()) { if (!filterSet.contains(field.getName())) { fields.add(field); } } // 设置私有字段可访问 for (Field field : fields) { field.setAccessible(true); try { // 复制值 field.set(to, field.get(from)); } catch (IllegalAccessException e) { e.printStackTrace(); } }}

对象复制(反射法)

public static void copyProp(Object from, Object to, String... filterProp) { HashSet<String> filterSet = new HashSet<String>(Arrays.asList(filterProp)); Class<?> fromc = from.getClass(); Class<?> toc = to.getClass(); List<Field> to_fields = new ArrayList<Field>() ; while (toc != null) { 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> T bean2OtherBean(Object bean, Class<T> tClass){ return JSON.parseObject(JSON.toJSONString(bean),tClass); }

列表

public static <T> List<T> list2OtherList(List originList, Class<T> tClass){ List<T> 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 <K,V> Map<K,V> bean2map(Object obj) throws IllegalAccessException { Map<String, Object> 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<K, V>) map; }

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