When many data items are input in the form, an exception occurs when the controller is submitted and the data is displayed.

1. Added (Model passes form data)

Request. getsession (). setattribute ("car", car); // data echo when an exception is thrown.

2. Modification (Model transfers form data)

Car car2 = carservice. detailall (car. getregno (); try {beanutils. copyproperties (car2, car);} catch (illegalaccessexception e) {EC = errorcode. sys_error; logger. error ("system error! ", E);} catch (invocationtargetexception e) {EC = errorcode. sys_error; logger. Error (" system error! ", E);} // convert the old and new values to request. setattribute (" car ", car2 );

Beanutils. copyproperties (car2, car );

 

3. Modification (MAP transmits form data)

Map <string, Object> map = carservice. detail (integer. valueof (carno); map. putall (data); // If the query result is the same as the new value data and the key value, it is replaced by data. Request. setattribute ("car", MAP );