Configure and use the Struts Tag Library

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Struts is very rich framework and it provides very good and user friendly way to develop web application forms.Struts provide many tag libraries to ease the development of web applications.

 Struts Tag libraries are:-Bean tag library :-This tags for accessing JavaBeans and their properties.
HTML tag library :- This tags to output standard HTML, including forms, text boxes, checkboxes, radio buttons etc.
Logic tag library :- This tags for generating conditional output, iteration capabilities and flow management
Tiles or Template tag library :- This tag is used for the application using tiles
Nested tag library :- This tag is used for using the nested beans in the application

Directory Structure of ValidationExample in Struts 1.3 Using MyEclipse IDE



index.jsp

<%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<html>
<head>
<title><bean:message key="label.title"/></title>
</head>
<div style="color: red;">
<html:errors/>
</div>
<h3><bean:message key="label.header"/></h3>
<html:form action="/validationAction">
<bean:message key="label.name"/>:
<html:text property="name" name="validationForm"/><br/>
<bean:message key="label.password"/>:
<html:text property="password" name="validationForm"/><br/>
<br/>
<html:submit><bean:message key="label.submit"/></html:submit>
<html:reset><bean:message key="label.reset"/></html:reset>
</html:form>
</html>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >
 
<web-app>
  <display-name>Maven Struts Examples</display-name> 
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>
        org.apache.struts.action.ActionServlet
    </servlet-class>
    <init-param>
        <param-name>config</param-name>
        <param-value>
         /WEB-INF/struts-config.xml
        </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet> 
  <servlet-mapping>
       <servlet-name>action</servlet-name>
       <url-pattern>*.do</url-pattern>
  </servlet-mapping> 
</web-app>

struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC 
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
<form-beans >
<form-bean name="validationForm" type="org.r4r.struts.ValidationForm"/>
</form-beans>
<global-exceptions />
  <global-forwards />
  <action-mappings >
    <action
      attribute="validationForm"
      input="/index.jsp"
      name="validationForm"
      path="/validationAction"
      scope="request"
      type="org.r4r.struts.ValidAction"
      cancellable="true">
      <forward name="success" path="/success.jsp" />
    </action>
  </action-mappings>
  <message-resources parameter="org.r4r.struts.ApplicationResources" />
</struts-config>

ValidationForm.java

package org.r4r.struts;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

@SuppressWarnings("serial")
public class ValidationForm extends ActionForm {
	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 ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {
		ActionErrors errors = new ActionErrors();
		if (name == null || name.length() < 1) {
		errors.add("name", new ActionMessage("error.name.required"));
		}
		if (password == null || password.length() < 1) {
		errors.add("password", new ActionMessage("error.password.required"));
		}
		return errors;
		}
	}

ValidationAction.java

package org.r4r.struts;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class ValidAction extends Action {

public ActionForward execute ( ActionMapping mapping,ActionForm form, 
HttpServletRequest request,HttpServletResponse response)  
throws Exception{ 
@SuppressWarnings("unused")
ValidationForm validationForm = (ValidationForm) form;
return mapping.findForward("success");
}
}

ApplicationResources.properties

#label message
label.title=Struts Validation Example
label.header=Struts Validation Example
label.name = User Name 
label.password = Password
label.submit = Submit
label.reset = Reset
error.name.required= Name is required<br/>
error.password.required= Password is required

success.jsp

<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<html>
<head>
<title><bean:message key="label.title"/></title>
</head>
<body>
<h3><bean:message key="label.header"/></h3>
<h4>Welcome , <bean:write name="validationForm" property="name"/></h4>
</body>
</html>

Output





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