两个对象其间根据属性名拷贝

两个对象之间根据属性名拷贝

// TODO 放软应用，以及以下代码应该发在公共的工具类中//缓存存放类的field信息private static Map<Class<?>, Map<String, Field>> fieldsCache = new HashMap<Class<?>,  Map<String, Field>>();private ReadWriteLock rw = new ReentrantReadWriteLock();private  Map<String, Field> getAllFieldsOfClass(Class<?> cls) {rw.readLock().lock(); Map<String, Field> fieldmap = null;try {fieldmap = fieldsCache.get(cls);if (fieldmap == null) {rw.readLock().unlock();rw.writeLock().lock();try {if (fieldmap == null) {fieldmap = new HashMap<String, Field>();Class<?> itr = cls;while ((null != itr) && !itr.equals(Object.class)) {Field[] declaredFields = itr.getDeclaredFields();if(declaredFields != null && declaredFields.length > 0){for(Field f : declaredFields){String fieldName = f.getName();if(fieldmap.get(fieldName) == null && !"serialVersionUID".equals(fieldName)&& !Modifier.isStatic(f.getModifiers())){fieldmap.put(fieldName, f);f.setAccessible(true);}}}itr = itr.getSuperclass();}fieldsCache.put(cls, fieldmap);}} finally {rw.writeLock().unlock();}rw.readLock().lock();}} finally {rw.readLock().unlock();}return fieldmap;}// TODO 放util类中private <T, R> R simpleConvertType(T t, Class<R> clazz) throws Exception {if (t == null)return null;Map<String, Field> fromFieldMap = getAllFieldsOfClass(t.getClass());R target = clazz.newInstance();Map<String, Field> toFieldMap = getAllFieldsOfClass(clazz);for(Map.Entry<String, Field> en : toFieldMap.entrySet()){String fieldName = en.getKey();Field valueField = fromFieldMap.get(fieldName);if(valueField != null){en.getValue().set(target, valueField.get(t));}}return target;}