它用于显示在JSF生命周期过程中存储在face上下文中的所有消息。
例:
// index.xhtml
<h:form id="form">
<h:outputLabel for="username">User Name</h:outputLabel>
<h:inputText id="name-id" value="#{user.name}"/><br/>
<h:outputLabel for="mobile">Mobile No.</h:outputLabel>
<h:inputText id="mobile-id" value="#{user.mobile}"/><br/>
<h:commandButton value="OK" action="response.xhtml"></h:commandButton>
<!-- Here, we are single tag to display all the errors. -->
<h:messages style="color: red"></h:messages>
</h:form>
// User.java
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
@ManagedBean
@RequestScoped
public class User{
@NotNull(message = "Name can't be empty")
String name;
@NotNull(message = "Mobile can't be empty")
@Size(min = 10, max = 10, message = "Mobile must have 10 digits")
String mobile;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMobile() {
return mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
}
输出量
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