Here is one simple example to create custom Validator in JSF. In this example name field is validating like whether the names starts with Mr or not.
1. Create a Validator class
package com.vinod.jsf;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.FacesValidator;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
@FacesValidator("com.vinod.jsf.MyValidator")
public class MyValidator implements Validator {
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
String name = (String) value;
if (!name.startsWith("Mr.")) {
FacesMessage message = new FacesMessage();
message.setDetail("Name should start with Mr.");
message.setSummary("Name should start with Mr.");
message.setSeverity(FacesMessage.SEVERITY_ERROR);
throw new ValidatorException(message);
}
}
}
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.FacesValidator;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
@FacesValidator("com.vinod.jsf.MyValidator")
public class MyValidator implements Validator {
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
String name = (String) value;
if (!name.startsWith("Mr.")) {
FacesMessage message = new FacesMessage();
message.setDetail("Name should start with Mr.");
message.setSummary("Name should start with Mr.");
message.setSeverity(FacesMessage.SEVERITY_ERROR);
throw new ValidatorException(message);
}
}
}
2. Create Managed Bean
package com.vinod.jsf;
import javax.faces.bean.ManagedBean;
@ManagedBean
public class ValidatorBean {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = "Hello " + name;
}
public ValidatorBean() {
}
public String validatorAction() {
System.out.println("Validator bean action");
return "ValidatorExample.xhtml";
}
}
import javax.faces.bean.ManagedBean;
@ManagedBean
public class ValidatorBean {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = "Hello " + name;
}
public ValidatorBean() {
}
public String validatorAction() {
System.out.println("Validator bean action");
return "ValidatorExample.xhtml";
}
}
3. Create a Facelet page
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.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>
<title>JSF Validator</title>
</h:head>
<h:body>
<h2>JSF Validator Example</h2>
<h:form id="vinod">
<h:outputText id="name" value="Name :" />
<h:inputText id="nametext" value="#{validatorBean.name}">
<f:validator validatorId="com.vinod.jsf.MyValidator" />
</h:inputText>
<h:message for="nametext" style="color:red;margin:8px;" ></h:message>
<h:commandButton value="Validate" id="submit"
action="#{validatorBean.validatorAction}">
</h:commandButton>
</h:form>
</h:body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.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>
<title>JSF Validator</title>
</h:head>
<h:body>
<h2>JSF Validator Example</h2>
<h:form id="vinod">
<h:outputText id="name" value="Name :" />
<h:inputText id="nametext" value="#{validatorBean.name}">
<f:validator validatorId="com.vinod.jsf.MyValidator" />
</h:inputText>
<h:message for="nametext" style="color:red;margin:8px;" ></h:message>
<h:commandButton value="Validate" id="submit"
action="#{validatorBean.validatorAction}">
</h:commandButton>
</h:form>
</h:body>
</html>
4. Output
Download example
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