Link validation pings a URL's final destination to check for problems. This is very helpful for bloggers as it helps to prevent broken and invalid links in your published document.
We'll learn about URL validators in this blog.
The URL validator verifies that the supplied value is a valid URL and a string. It can be used for website URLs, exchanged links, etc.
For the URL validator, just one parameter has been defined.
<validators>
<!-- Plain Validator Syntax -->
<validator type="url">
<param name="fieldName">website</param>
<message>Invalid website url</message>
</validator>
</validators> <validators>
<!-- Field Validator Syntax -->
<field-validator type="url">
<field name="website">
<message>Invalid website url</message>
</field>
</field-validator>
</validators> Utilizing the struts UI tags, this JSP website generates a form. The user's name, password, and email address are obtained.
index.jsp
<%@ taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<STYLE type="text/css">
.errorMessage{color:red;}
</STYLE>
</head>
<body>
<s:form action="register">
<s:textfield name="url" label="Website URL"></s:textfield>
<s:submit value="register"></s:submit>
</s:form>
</body>
</html> The execute method is overridden in this action class, which derives from the ActionSupport class.
RegisterAction.java
import com.opensymphony.xwork2.ActionSupport;
public class Register extends ActionSupport{
private String url;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String execute(){
return "success";
}
} In this case, the validation is carried out utilizing bundled validators.
Register-validation.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
<validators>
<field name="url">
<field-validator type="requiredstring">
<message>URL can't be blank</message>
</field-validator>
<field-validator type="url">
<message>URL must be correct e.g. XYZ.com</message>
</field-validator>
</field>
</validators>
This XML file specifies a workflow stack interceptor and a different outcome with the name ValidatorWorkflowStack.
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="register" class="com.javatpoint.Register">
<result name="input">index.jsp</result>
<result>welcome.jsp</result>
</action>
</package>
</struts>It is a straightforward JSP file that shows the user's information.
welcome.jsp
<%@ taglib uri="/struts-tags" prefix="s" %>
URL is:<s:property value="url"/> 
Enter any username and url and click on the login button.
First, using Custom Validation Here, we must supply the implementation of the validate method and implement the Validatable interface (or extend the ActionSupport class).
Second, Utilizing Input Validation (built-in validators), Struts 2 has various preset validation features that can be utilized in struts two applications.
A field for entering a URL is defined using the input type="URL" tag. Before the form can be submitted, the input value is automatically validated.
The validation framework, an essential component of Struts, helps the application run the rules for validating before the action method is called. Typically, Javascript is used to implement client-side validation. However, client-side validation should not be the only method used.
You can specify validation rules using the Validation Framework, and either the client-side or the server-side can implement these rules. Using JBoss Developer Studio's specific editor for the XML files that manage validation in a project makes using the Validation Framework in Struts considerably simpler.
Using Spring's robust expression evaluation engine, the validation framework evaluates the Validator's applicability criteria and validation rules. As a result, any valid validator's test and attributes can accept any good Spring expression.
So that's the end of the article. url validator
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