反射的更改 更改 static final 静态常量的值 。 这样就能动态的更改 决定spring 用那一套实现

public class Bean {

 

    public static final String dbtype=new String();

 

}

 

 

public static  void changFinalProperty(Class clazz ,Object newvalue)

    {

         

        try {

            Object o = clazz.newInstance();

            Field  field = clazz.getDeclaredField("dbtype");

            field.setAccessible(true);

            Field modifiersField = Field.class.getDeclaredField("modifiers");

            modifiersField.setAccessible(true);

            modifiersField.set(field, field.getModifiers() & ~Modifier.FINAL);

            field.set(null, newvalue);

        } catch (NoSuchFieldException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (SecurityException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IllegalArgumentException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (InstantiationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

         

        System.out.println(Bean.dbtype);

    }