scope="prototype" sets the action in ssh to multiple examples, such as
<bean name="accountActionBean" scope="prototype" class="xxx.action.AccountAction">
<property name="accountService" ref="accountServiceImpl" />
</bean>
......
In this way, a new action is guaranteed every time, avoiding continuous transmission of attribute values in a single action, for example, the original user.addTime="2017-01-11 12:23:13"
If it is a single-column action, if user.addTime is not set in the jsp, after the page is submitted, the action will use the last saved attribute value, which is "2017-01-11 12:23:13", not a null value. This situation will not occur in multiple cases, but user.addTime=null. So generally set scope="prototype"