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在JAVA编程的WEB开发和UPDATE过程当中,通常的做法是先load出数据库的原值,然后再把页面的值更新数据库中数据,如果页面对象的存储值不够(相对数据库LOAD出来的对象),那么就有可能在更新时用NULL把原值覆盖,针对上面的情况自己写了个类,来进行自动赋值 public class CopyObject { public static Object copy(Object rtuObject, Object object){ Class classType = object.getClass(); Class rtuClassType = rtuObject.getClass(); Field fields[] =classType.getDeclaredFields(); for(int i=0;i Field field = fields[i]; String fieldName = field.getName(); String firstLetter = fieldName.substring(0,1).toUpperCase(); String getMethodName = "get"+firstLetter+fieldName.substring(1); String setMethodName = "set"+firstLetter+fieldName.substring(1); try { Method getMethod = classType.getMethod(getMethodName,new Class[]{}); Method setMethod = rtuClassType.getMethod(setMethodName,new Class[]{field.getType()}); Object value = getMethod.invoke(object,new Object[]{}); if (null!=value){ setMethod.invoke(rtuObject,new Object[]{value}); } } catch (Exception e) { e.printStackTrace(); }[@more@]
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