JSF:如何验证字段并通过bean验证返回错误消息？

Question

我有一个联系表单,我有一些由bean验证验证的字段,如何在提交后返回bean验证错误消息？

例如:

<h:form>
    <h:inputText id="name" value="#{contact.client.name}"></h:inputText>Name (Required)
    <h:inputText id="email" value="#{contact.client.email}"></h:inputText>E-Mail (Required)
    <h:inputText id="website" value="#{contact.client.website}"></h:inputText>Website (Optional)
    <h:inputText id="text" value="#{contact.client.text}"></h:inputText>Message (Required):

    <h:commandButton value="Send" action="#{contact.sendMessage}" >
        <f:ajax execute="@form" render="@form"/>
    </h:commandButton>

</h:form>

这就是我验证字段的方式:

        // Client.java (model)
    @NotNull(message="Please provide your name")
    private String name;

    @NotNull(message="Please provide your email")
    @Pattern(regexp = "([^.@]+)(\\.[^.@]+)*@([^.@]+\\.)+([^.@]+)", message = "Invalid e-mail")
    private String email;

    @Pattern(regexp = "(http[s]?://|ftp://)?(www\\.)?[a-zA-Z0-9-\\.]+\\.([a-zA-Z]{2,5})$", message = "Not valid URL")
    private String website;

    @NotNull(message="Please provide your message")
    private String text;

Answer 1

使用<h:message>您for应该引用id输入组件的属性来附加到特定组件的属性:

<h:inputText id="name" value="#{contact.client.name}"></h:inputText>Name (Required)
<h:message for="name" />
<h:inputText id="email" value="#{contact.client.email}"></h:inputText>E-Mail (Required)
<h:message for="email" />
<h:inputText id="website" value="#{contact.client.website}"></h:inputText>Website (Optional)
<h:message for="website" />
<h:inputText id="text" value="#{contact.client.text}"></h:inputText>Message (Required):
<h:message for="text" />

或者用于<h:messages/>在一个地方展示它们:

<h:messages />

是的,bean验证消息也在那里结束.

不要忘记确保按钮的render属性也包含它们.

也可以看看:

• Glassfish和Eclipse的JSF 2.0教程 - Hello World - 视图