Java代碼實(shí)現(xiàn)Map和Object互轉(zhuǎn)及Map和Json互轉(zhuǎn)
先給大家介紹下map和object互相轉(zhuǎn)換的代碼。
具體代碼如所示:
/** * 使用org.apache.commons.beanutils進(jìn)行轉(zhuǎn)換 */ 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進(jìn)行轉(zhuǎn)換 */ 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(); 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進(jìn)行轉(zhuǎn)換 */ 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; } <p>} </p><p> </p><p>from:http://www.open-open.com/code/view/1423280939826</p>
下面給大家介紹Map和json的互相轉(zhuǎn)換
第一段代碼
Map<String,Object> map = new HashMap<String,Object>(); map.put("method","json"); map.put("param",null); map.put("time","2015-01-23 10:54:55"); ObjectMapper mapper = new ObjectMapper(); mapper.writeValueAsString(map);
第二段代碼
public static void readJson2Map(String json) { ObjectMapper objectMapper = new ObjectMapper(); try { //將json字符串轉(zhuǎn)成map結(jié)合解析出來(lái),并打印(這里以解析成map為例) Map<String, Map<String, Object>> maps = objectMapper.readValue( json, Map.class); System.out.println(maps.size()); Set<String> key = maps.keySet(); Iterator<String> iter = key.iterator(); while (iter.hasNext()) { String field = iter.next(); System.out.println(field + ":" + maps.get(field)); } } catch (JsonParseException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } readJson2Map(json);
以上內(nèi)容是小編給大家介紹的Java代碼實(shí)現(xiàn)map和Object互轉(zhuǎn)及Map和json的互轉(zhuǎn)的相關(guān)知識(shí),希望對(duì)大家有所幫助,如果大家想了解更多資訊敬請(qǐng)關(guān)注腳本之家網(wǎng)站,謝謝!
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