java实现Object和Map之间的转换3种方式

利用commons.BeanUtils实现Obj和Map之间转换，这种是最简单，也是最经常用的

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);
  }

利用java reflect完成Obj和Map之间的相互转换

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;
}

利用Introspector完成Obj和Map之间的相互转换

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;
    }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://www.cnblogs.com/gyjx2016/p/6078210.html