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luni, 2 martie 2015

JSF Tip - Use <h:outputText> to easily fetch data from a bean method

Let's suppose that you have the following bean content:

@Named
@SessionScoped
public class PlayerBean implements Serializable {
   
    private Map<Integer, String> atp = new HashMap<>();
    private String player;

    public PlayerBean() {     
        atp.put(1, "Rafael Nadal");
        atp.put(2, "Novak Djokovic");
        atp.put(3, "Roger Federer");
        atp.put(4, "Andy Murray");
        atp.put(5, "David Ferrer");
    }

    public String playerByRank(int rank) {
        return "Number " + rank + " in ATP is: " + atp.get(rank);
    }
}

Now, we simply want to display on screen the ATP player for rank 4. Without any fancy workarounds, we can exploit parameterized EL, as below (no forms, no getters/setters):

<h:body>
 <h:outputText value="#{playerBean.playerByRank(4)}"/>
 #{playerBean.playerByRank(4)}
</h:body>

Output on screen:

Number 4 in ATP is: Andy Murray
Number 4 in ATP is: Andy Murray

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