我想在URL中传递一些ID,这些ID稍后将由辅助bean读取。对于每个ID,将遵循特定操作。
F.G。网址:localhost:8585 / monit / accepted.jsf?acceptMsg = 948& acceptMsg = 764
豆子:
@ManagedBean
@RequestScoped
public class AcceptedBean {
@EJB
private MessageService messageService;
@ManagedProperty("#{paramValues.acceptMsg}")
private String[] acceptMsg;
public String[] getAcceptMsg() {
return acceptMsg;
}
public List<Message> getMessages() {
return messageService.getAcceptedMessages();
}
public void setAcceptMsg(String[] acceptMsgs) {
this.acceptMsg = acceptMsgs;
if(acceptMsg != null) {
try {
for (String accept: acceptMsg) {
final Message o = messageService.find(Integer.parseInt(accept));
messageService.accept(o);
FacesContext.getCurrentInstance().
addMessage(null,
new FacesMessage(FacesMessage.SEVERITY_INFO,
"Message was accepted:", o.getSubject()));
}
} catch (Exception e) {
FacesContext.getCurrentInstance().
addMessage(null,
new FacesMessage(FacesMessage.SEVERITY_ERROR,
"Error:", e.getMessage()));
}
}
}
}
acceped.xhtml:
....
<f:metadata>
<f:viewParam name="acceptMsg" value="#{acceptedBean.acceptMsg}" />
</f:metadata>
....
当我尝试用.xhtml中的绑定替换 value 时我得到了
Cannot convert javax.faces.component.UIViewParameter@ee2549 of type class javax.faces.component.UIViewParameter to class [Ljava.lang.String;
有关如何解决转换错误的任何想法都将不胜感激!
答案 0 :(得分:0)
<f:viewParam>
不支持多个参数值。去掉它。在这种特殊情况下你不需要它。您已经设置了@ManagedProperty("#{paramValues.acceptMsg}")
。
无关,我只会用@PostConstruct
方法替换setter中的业务作业。除了获取或设置属性之外,getter / setter原则上不应该做任何其他事情,这表明设计不好,因为它们只是访问点,并且可以基于每个请求多次调用。