如何在另外一个managed-bean 中访问一个managed-bean ?

有3种方法可以达到该目的:

1. 使用值绑定
2. 使用变量监视器:Using Variable Resolver
3. 持有引用属性:Having the reference property

例如,在 faces-config.xml中有下面的声明

<managed-bean>  <managed-bean-name>person</managed-bean-name> <managed-bean-class>demo.PersonBean</managed-bean-class>  <managed-bean-scope>session</managed-bean-scope><managed-bean><managed-bean>  <managed-bean-name>bank</managed-bean-name> <managed-bean-class>demo.BankBean</managed-bean-class>  <managed-bean-scope>session</managed-bean-scope> <managed-bean>

并且你想在Person中访问Bank

使用值绑定,代码如下:

FacesContext fc = FacesContext.getCurrentInstance();
BankBean bank = (BankBean) fc.getApplication().createValueBinding("#{bank}").getValue(fc);

 

使用变量监视器的代码如下: Variable Resolver:

 

FacesContext fc = FacesContext.getCurrentInstance();
BankBean bank = (BankBean) fc.getApplication().getVariableResolver().resolveVariable(fc, "bank");

 

在上面的两种方法中,第二个 managed-bean (bank)的名字被硬编码在java代码中.如果你不想硬编码你可以在managed bean声明中引用另外一个bean:

<managed-bean>  <managed-bean-name>Person</managed-bean-name> <managed-bean-class>demo.PersonBean</managed-bean-class>  <managed-bean-scope>session</managed-bean-scope>  <managed-property>   <property-name>bank</property-name>   <property-class>demo.BankBean</property-class>   <value>#{bank}</value>  </managed-property><managed-bean><managed-bean>  <managed-bean-name>bank</managed-bean-name> <managed-bean-class>demo.BankBean</managed-bean-class>  <managed-bean-scope>session</managed-bean-scope> <managed-bean>