java实现Object和Map之间的转换3种方式

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);  }

    public Map<String,Object> Obj2Map(Object obj) throws Exception{      Map<String,Object> map=new HashMap<String, Object>();      Field[] fields = obj.getClass().getDeclaredFields();      for(Field field:fields){        field.setAccessible(true);        map.put(field.getName(), field.get(obj));      }      return map;    }    public Object map2Obj(Map<String,Object> map,Class<?> clz) throws Exception{      Object obj = clz.newInstance();      Field[] declaredFields = obj.getClass().getDeclaredFields();      for(Field field:declaredFields){        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 Map<String,Object> obj2Map(Object obj) throws Exception{      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;    }        public Object map2Obj(Map<String,Object> map,Class<?> clz) throws Exception{      if (map == null)          return null;        Object obj = clz.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;    }