后臺如何調(diào)用JSF頁面的值

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1.???? 通過 backing bean 對頁面的值進(jìn)行綁定

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JSF 封裝的 HTML 控件都有一個 binding 的屬性，通過該屬性可以在后臺對該控件取值賦值。

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< body >

??????? < f:view >

??????? ??????? < h:form >

??????? ??????? ??????? < h:inputText binding = "#{loginBean.txtUser}"></h:inputText>

??????? ??????? ??????? < h:commandButton actionListener = "#{loginBean.txtListener}"value="enter"></h:commandButton>

??????? ??????? </ h:form >

??????? </ f:view >

</ body >

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??????? private UIInput txtUser ;

??????? public UIInput getTxtUser() {

??????? ??????? return txtUser ;

??????? }

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??????? public void setTxtUser(UIInput txtUser) {

??????? ??????? this . txtUser = txtUser;

??????? }???????

???????

??????? public void txtListener(ActionEvent e){

??????? ??????? txtUser .setValue( "11111" );

??????? ??????? System. out .println( txtUser .getValue().toString());

??????? }

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2.???? 在一個 bean 中調(diào)用其它 bean

???????? ???????? ??????? FacesContext context = FacesContext.getCurrentInstance();

??????? ??????? ??????? ValueBinding binding = context.getApplication().createValueBinding(

??????? ??????? ??????? ??????? ??????? "#{uptBean}" );

??????? ??????? ??????? uptBean bean = (uptBean) binding.getValue(context);

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這段代碼就是用來調(diào)用 uptBean 。 CreateValueBinding （）方法中的參數(shù)，可以是 bean ，也可以 bean 中對應(yīng)得數(shù)據(jù)。

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posted on 2007-01-18 12:21 瘋流成性 閱讀(1161) 評論(0)  編輯  收藏 所屬分類: Java