為什么Strut2.x要改變Struts1中Action的單例模式,而為每個(gè)request申請(qǐng)一個(gè)Action實(shí)例?

C__J

RT


在DOC看到他們兩的區(qū)分,但并沒有找到為什么這么做,還請(qǐng)大蝦指點(diǎn)指點(diǎn)


Threading Model

Struts 1 Actions are singletons and must be thread-safe since there will only be one instance of a class to handle all requests for that Action. The singleton strategy places restrictions on what can be done with Struts 1 Actions and requires extra care to develop. Action resources must be thread-safe or synchronized.

Struts 2 Action objects are instantiated for each request, so there are no thread-safety issues. (In practice, servlet containers generate many throw-away objects per request, and one more object does not impose a performance penalty or impact garbage collection.)

C__J

為什么沒人回答？？？？？？？？？？？

bs

struts2也許是考慮更方便的資源管理，如果申請(qǐng)/釋放。而struts線程是共享一個(gè)實(shí)例，這樣雖然在性能上有所提升，但容易出現(xiàn)內(nèi)存溢出等情況。

struts2也更貼近了WEB機(jī)制，這點(diǎn)運(yùn)行上有點(diǎn)類似PHP，以上未做驗(yàn)證，僅供參考。