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 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 Obj2Map(Object obj) throws Exception{
      Map map=new HashMap();
      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 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 obj2Map(Object obj) throws Exception{
      Map map=new HashMap();
      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 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考高分网。