map和object互相转换
2016-03-29 16:21
405 查看
/** * 使用org.apache.commons.beanutils进行转换 */ 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(); //默认PropertyDescriptor会有一个class对象,剔除之
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; } }
推荐使用方法二,方法一的内部实现也是方法二,区别是方法一不会剔除“class”这个key,obj转成map后,会多一个key为class,value为类路径的Entry
相关文章推荐
- java源码分析 ---- Object类
- Python报错TypeError: 'str' object is not callable
- cocoapod 引入头文件自动补齐
- 关联(objc_setAssociatedObject、objc_getAssociatedObject、objc_removeAssociatedObjects)
- iOS高效开发必备的10款Objective-C类库
- Java的Map与Object互转
- iOS开发66-setValue:forKey:和 setObject:forKey:的区别
- Objective-C中@property和@synthesize的用法
- Objective-C编码规范[译]
- js中数组(array)和对象(object)的区别
- 从C语言的变量声明到Objective-C中的Block语法
- object references an unsaved transient instance - save the transient instance before flushing错误
- Volley使用JsonObjectRequest发送Post请求失败
- delphi 组件容器TObjectList代替List
- Objective-C中的runtime详解_1
- swift学习-AnyObject类型记录
- Xcode的一些常用配置
- Object类中方法
- 一些错误的解决方法
- Objective-C监听键盘删除按钮