设置可编辑的默认输入值

Question

我想创建一个JSF应用程序用户必须提供年龄的地方。默认值为18，并且可以编辑（如果用户想提供其他值）。

如何实现此功能？

用户提供的输入值或默认值即18将保存在数据库中

<h:form>
    <p:panel id="panel" header="New User">

    <h:panelGrid columns="3" cellpadding="5">

        <p:outputLabel for="age" value="Age:" />
        <p:inputText id="age" value="#{managedBean.entityBean.age}" required="true" label="Age">
        </p:inputText>

    </h:panelGrid>

    <p:commandButton value="Save" update="panel" action="#{managedBean.save}"  />
</p:panel>
</h:form>

managedBean.java

private Integer age;

public Integer getAge() {
    return age;
}

public void setAge(Integer age) {
    this.age = age;
}

Entity.java

public class Entity implements Serializable {
@Column(name = "AGE")
private Integer age;

public Integer getAge() {
    return age;
}

public void setAge(Integer age) {
    this.age = age;
}

managedBean.java

@ManagedBean(name = "managedBeanJava")
@ViewScoped
public class managedBeanJava implements Serializable {
    private static final long serialVersionUID = 1L;
    private static final Logger logger = LoggerFactory.getLogger(managedBeanJava.class);

    private Entity entityBean;

    public Entity getEntityBean() {
        return entityBean;
    }

    public void setEntityBean(Entity entityBean) {
        this.entityBean = entityBean;
    }

    private Integer age  = 50;

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @PostConstruct
    public void init() {

        ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
        Map<String, String> params = externalContext.getRequestParameterMap();

    }

}

Answer 1

您可以直接在托管bean中定义<h:inputText>的默认值。

private Integer age = 18;