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Actionerror and Actionmessage Tags (Non-Form UI Tags) Example

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In this section, we are going to describe the actionerror and actionmessage tags. The actionerror tag is a UI tag that renders action errors (in the jsp pages.) if they exists while the actionmessage tag renders action messages if they exists.

Actionerror and Actionmessage Tags (Non-Form UI Tags) Example

     

In this section, we are going to describe the actionerror and actionmessage tags. The actionerror tag is a UI tag that renders action errors (in the jsp pages.) if they exists while the actionmessage tag renders action messages if they exists.

Add the following code snippet into the struts.xml file.
struts.xml

<action name="actionerrorTag">
   <result>/pages/uiTags/Login.jsp</result>
</action>

<action name="login" class="net.roseindia.checkValidUser">
  <result name="input">/pages/uiTags/Login.jsp</result>
  <result name="error">/pages/uiT
ags/error.jsp</result>
  <result>/pages/uiTags/validUser.jsp</result>
</action>

Create an action class that uses methods addActionMessage(String) and addActionError(String) within the execute() method. The addActionMessage(String) will print the passed string on the success jsp page while the addActionError(String) will print the passed string on the error jsp page.

checkValidUser.java

package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import java.util.*;

public class checkValidUser extends ActionSupport {
  private String username = null;
  private String password = null;
  public String execute() throws Exception{
  if ((getUsername().equals("Roseindia")) && 
  (
getPassword().equals("Roseindia"))){
  
 
addActionMessage("Valid User!");
  return SUCCESS;
  }
  else{
  addActionError("Invalid User!");
  return ERROR;
  }
  }
  //Set and get the user name
  public void setUsername(String name){
  username = name;
  }
  public String getUsername(){
  return username;
  }
  //set and get the password
  public void setPassword(String pass){
  password = pass;
  }
  public String getPassword(){
  return password;
  }
}

Create a Login jsp page as shown:
Login.jsp

<%taglib prefix="s" uri="/struts-tags" %>

<html>
  <head>
  <title>Actionerror Tag Example!</title>
  <body>
  <s:form action="loginmethod="POST">
  <s:textfield label="User Name" 
name=
"username" size="20" maxlength="10" />
  <s:password label="Password" 
name="password" size="20" maxlength="10" />
  <s:submit value="Submit" />
  </s:form>
  
  </body>
</html>

Create a jsp page that will display your error message  (when fails to logged-in) using the empty <s:actionerror /> tag as shown:
error.jsp

<%taglib prefix="s" uri="/struts-tags" %>

<html>
  <head>
  <title>Actionerror Tag Example!</title>
  <body>
  <h1>
  <s:actionerror />
  </h1>
  <a href="/struts2tags/roseindia/actionerrorTag.action">Go Back</a>
  </body>
</html>

Create a jsp page that will display a message (when successfully logged-in)  using the empty <s:actionmessage /> tag as shown:

validUser.jsp

<%taglib prefix="s" uri="/struts-tags" %>

<html>
  <head>
  <title>Actionerror Tag Example!</title>
  <body>
  <h1>
  <s:actionmessage />
  </h1>
  </body>
</html>

you will see the output of the Login.jsp as shown below:

Enter the wrong user name but correct password in the login page.

you will get the following output:

Enter the correct user name but incorrect password in the login page

you will get the following output:

Enter correct values in both fields of the login page

you will get the following output:

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Posted on: March 18, 2008

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