Question

What is the correct (best) way to set a managed bean’s property from a request’s parameter?

The URL for my JSF page looks something like this:

https://eample.com/app/faces/page.xhtml?ts=2012-01-05T10:00:00.000

I have found that I can read the parameter using the following:

<h:outputText value="#{param['ts']}" />

But what I really need to do is set my bean’s property from this value. So what
is the best JSF way code this so I get something which results Java code like this:

myBean.setTimestamp(request.getParameter("timestamp"));

Many thanks

Answer 1

Assuming a JSF managed bean with request scope, inject it as a managed property:

import javax.faces.bean.*;

@ManagedBean @RequestScoped
public class ReqBean {
    @ManagedProperty("#{param.ts}") private String ts;

    public String getTs() {
        return ts;
    }

    public void setTs(String ts) {
        this.ts = ts;
    }
}

If the bean is in a broader scope, you will need to look it up programmatically:

private String lookUpTs() {
    return FacesContext.getCurrentInstance()
                       .getExternalContext()
                       .getRequestParameterMap()
                       .get("ts");
}

If you are using CDI beans, you will need to consider other options (see here for one approach.)