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如何查找會話中是否設置了變量值?如何查找會話變量是否存在
if(session.getAttribute("tot_demand"))//need to change
//if value is already set then do this.
else
//if not set then do this.
對於上面的代碼工作,我需要寫些什麼?
如何查找會話中是否設置了變量值?如何查找會話變量是否存在
if(session.getAttribute("tot_demand"))//need to change
//if value is already set then do this.
else
//if not set then do this.
對於上面的代碼工作,我需要寫些什麼?
比較,以null
:
if (session.getAttribute("tot_demand") != null) {
// already set
} else {
// not yet set
}