Posted on: May 24, 2009 at 12:00 AM
Struts 2 Redirect Action
In this section, you will get familiar with struts 2 Redirect action and learn to use it in the struts 2 application.
Redirect After Post: This post pattern is supported by Struts 2. This is a common pattern in web application. In which an action is redirected to another action. This is a common use to redirect action to display a page.
Redirect Action Result: This redirect pattern is supported by Struts 2. The ActionMapper provided by the ActionMapperFactory is used to redirect the browser to a URL that invokes the specified action. You can see a simple implementation of this in the following struts 2 application.
Redirects Dynamic Parameters: The action-redirect result takes following parameters:
- actionName
- namespace
- method
- encode
- parse
- location
- prependServletContext
Follow the steps to develop a Redirect Action example:
Step 1: Create the struts.xml file and add the following xml snippet in the struts.xml file.
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<!-- Rose India Struts 2 Tutorials -->
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<include file="struts-default.xml"/>
<package name="roseindia" namespace="/roseindia" extends="struts-default">
<!-- Redirect Action -->
<action name="showAjaxLoginCancelForm">
<result>/pages/ajaxloginCancel.jsp</result>
</action>
<action name="ajaxloginCancel" class="net.roseindia.Login">
<result name="input">/pages/ajaxloginCancel.jsp</result>
<result name="error">/pages/ajaxloginCancel.jsp</result>
<result name="cancel" type="redirect">/pages/ajaxloginCancel.jsp</result>
<result>/pages/ajaxloginsuccess.jsp</result>
</action>
<!-- Add actions here -->
</package>
<!-- Add packages here -->
</struts>
Step 2 : Create an input form.
ajaxloginCancel.jsp
<%@ taglib prefix="s" uri="/struts-tags"%><html>
<head>
<s:head theme="ajax" debug="true"/>
</head>
<body>
<s:div id="loginDiv" theme="ajax">
<div style="width: 300px;border-style: solid">
<s:form action="ajaxloginCancel" validate="true">
<tr>
<td colspan="2">
Login
</td>
</tr>
<tr>
<td colspan="2">
<s:actionerror />
<s:fielderror />
</td>
<s:textfield name="username" label="Login name"/>
<s:password name="password" label="Password"/>
<s:submit value="Submit" theme="ajax" targets="loginDiv" notifyTopics="/ajaxloginCancel"/>
<s:submit action="showAjaxLoginCancelForm" value="Cancel" onclick="form.onsubmit=null"/>
</s:form>
</div>
</s:div>
</body>
</html>
Step 3 : Create an Action class.
Login.java
package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import java.util.Date;
/**
* <p> Validate a user login. </p>
*/
public class Login extends ActionSupport {
public String execute() throws Exception {
if(!getUsername().equals("Admin") || !getPassword().equals("Admin")){
addActionError("Invalid user name or password! Please try again!");
return ERROR;
}
if(getUsername().equals("Admin") || getPassword().equals("Admin")){
return SUCCESS;
}else{
return NONE;
}
}
// ---- Username property ----
/**
* <p>Field to store User username.</p>
* <p/>
*/
private String username = null;
/**
* <p>Provide User username.</p>
*
* @return Returns the User username.
*/
public String getUsername() {
return username;
}
/**
* <p>Store new User username</p>
*
* @param value The username to set.
*/
public void setUsername(String value) {
username = value;
}
// ---- Username property ----
/**
* <p>Field to store User password.</p>
* <p/>
*/
private String password = null;
/**
* <p>Provide User password.</p>
*
* @return Returns the User password.
*/
public String getPassword() {
return password;
}
/**
* <p>Store new User password</p>
*
* @param value The password to set.
*/
public void setPassword(String value) {
password = value;
}
}
Step 4 : Create the appropriate validator as shown:
The validation.xml format is either <ActionClassName>-validation.xml or <ActionClassName>-<ActionAliasName>-validation.xml.
Login-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="username"> <field-validator type="requiredstring"> <param name="trim">true</param> <message>Login name is required</message> </field-validator> </field> <field name="password"> <field-validator type="requiredstring"> <param name="trim">true</param> <message>Password is required</message> </field-validator> </field> </validators>
When entered the correct user name and password then the user gets the ajaxloginsuccess.jsp page displaying the entered text
ajaxloginsuccess.jsp
<html>
<head>
<title>Login Success</title>
</head>
<body>
<p align="center"><font color="#000080" size="5"> Login Successful !</font></p>
<h1> Welcome to <%=request.getParameter("username")%> </h1>
</body>
</html>
Output:
When this application executes you get the following:
When you don't fill any field and click "Submit" button, you get:
If you click the "Cancel" button then redirect action executes and provides:
If you are facing any programming issue, such as compilation errors or not able to find the code you are looking for.
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