JSF中控件赋值方式
JSF中对控件的赋值有以下几种方式。
1. 通过资源文件赋值。
2. 通过MBean属性赋值。
3. 通过隐含对象赋值。
4. 将控件绑定到MBean中的属性。
其中,赋值可以为一个公式。下面分别介绍:
1. 通过资源文件赋值:
需先定义资源文件Message.peoperties,代码如下:
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代码中JSF文件通过<f:loadBundle>标签引入资源文件,然后用#{msg.USER_NAME}来引用Resource文件中USER_NAME的值。在JSF1.2中,也可以通过在faces-config中配置resource-bundle来引入资源文件。
2. 通过MBean属性赋值:
MBean代码如下:
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用这种方式可以将控件的Value与MBean中的某一属性双向绑定,从而可以在其中之一被修改时自动修改另外一个的值,这种用法较多。
3. 用隐含对象赋值:
JSF中的隐含对象包含:
隐含对象 | 描述 |
applicationScope | 整个应用域,相当于JSP中的application |
cookie | Cookie中资料,相当于JSP中的cookie |
facesContext | JSF中的FacesContext对象,可以通过它来访问其它对象 |
header | 当前Request的Http header的Map |
headerValues | 当前Request中所有的Http header的Map |
initParam | 当前应用的初始化参数的Map |
param | 请求参数的Map |
paramValues | 当前参数的Map |
requestScope | 当前请求,相当于JSP中的request |
sessionScope | Session的Map,相当于JSP中的session |
view | 当前view |
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基本方法是在MBean中建立类型为javax.faces.component包中的某一控件的属性,然后在JSF代码中用控件的binding属性来将整个控件与MBean中的属性绑定,这样就可以在MBean中修改JSF控件的各种属性,这里不做详细介绍。