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java版map和object互转的三种方法

/**  
 * 使用org.apache.commons.beanutils进行转换  
 */   
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进行转换  
 */   
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进行转换  
 */   
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);  //true可以访问类中的私有变量  
            map.put(field.getName(), field.get(obj));    
        }      
     
        return map;    
    }     
}  

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