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** * Convert using com.fasterxml.jackson.databind.ObjectMapper */ class A { public static Object mapToObject (Map<String, Object> map, Class<?> beanClass) throws Exception { if (map == null) { return null; } ObjectMapper objectMapper = new ObjectMapper(); Object obj = objectMapper.convertValue(map, beanClass); return obj; } public static Map<?, ?> objectToMap (Object obj) { if (obj == null) { return null; } ObjectMapper objectMapper = new ObjectMapper(); Map<?, ?> mappedObject = objectMapper.convertValue(obj, Map.class); return mappedObject; } } /** * Use org.apache.commons.beanutils for conversion */ class B { 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); } } /** * Convert using Introspector */ class C { 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; } } /** * use reflect to convert */ class D { 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; } } |
Categories: Java