验证用户名(不能有下划线)和密码（不能小于六位）
1.UserBean.java
package ajax;
import java.io.Serializable;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.ValidatorException;
@ManagedBean(name="ajax")
@SessionScoped
public class UserBean implements Serializable {
private String name="";
private String password;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public void validateName(FacesContext fc,UIComponent c,Object value){
if(((String)value).contains("_")){
throw new ValidatorException(new FacesMessage("Name cannot contain underscores!"));
}
}
public void validatePassword(FacesContext fc,Object value){
if(((String)value).length()<6){
throw new ValidatorException(new FacesMessage("Password at least six words!"));
}
}
}
2.hello.xhtml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <Meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Insert title here</title> </h:head> <h:body> <h:form> <p> <h:outputText value="Name"/> <h:inputText id="name" value="#{ajax.name}" validator="#{ajax.validateName}"> <f:ajax event="blur" execute="@this" render="nameError"/> </h:inputText> <h:message for="name" id="nameError" style="color:red" /></p> <h:outputText value="Password"/> <h:inputSecret id="password" value="#{user.password}" validator="#{ajax.validatePassword}"> <f:ajax event="blur" render="passwordError"/> </h:inputSecret> <h:message for="password" id="passwordError" style="color:red" /> </h:form> </h:body> </html>
3.运行结果如下
