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Crear una página de error no encontrado 404 con Struts 2

Es necesario implementar un Unknown Handler (están disponibles desde la versión Struts 2.1 en adelante)

http://struts.apache.org/docs/unknown-handlers.html

PageNotFoundAction.java

package com.test;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Actions;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.dispatcher.Dispatcher;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.UnknownHandler;
import com.opensymphony.xwork2.XWorkException;
import com.opensymphony.xwork2.config.ConfigurationManager;
import com.opensymphony.xwork2.config.RuntimeConfiguration;
import com.opensymphony.xwork2.config.entities.ActionConfig;
public class PageNotFoundAction extends ActionSupport implements UnknownHandler{
    private static final long serialVersionUID = 9086900467866735407L;
    @Actions({
        @Action(value = "pageNotFound", results = @Result(name = "success", location = "/error.jsp")) })
        public String execute() {
          ServletActionContext.getResponse().setStatus(HttpServletResponse.SC_NOT_FOUND);    
        return SUCCESS;
    }
    @Override
    public ActionConfig handleUnknownAction(String namespace, String actionName)
            throws XWorkException {       
        ConfigurationManager configurationManager = Dispatcher.getInstance().getConfigurationManager();
        RuntimeConfiguration runtimeConfiguration = configurationManager.getConfiguration().getRuntimeConfiguration();
        ActionConfig actionConfig = runtimeConfiguration.getActionConfig(namespace, actionName);
        if(actionConfig == null) { // invalid url request, and this need to be handled
            actionConfig = runtimeConfiguration.getActionConfig("", "pageNotFound");
        }
        return actionConfig;
    }
    @Override
    public Object handleUnknownActionMethod(Object arg0, String arg1)
            throws NoSuchMethodException {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public com.opensymphony.xwork2.Result handleUnknownResult(
            ActionContext arg0, String arg1, ActionConfig arg2, String arg3)
            throws XWorkException {
        // TODO Auto-generated method stub
        return null;
    }   
}

 

error.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
        <p>
            404 PAGE NOT FOUND!
        </p>
</body>
</html>

 

struts.xml

  • añade la siguiente línea a tu struts.xml
<bean type="com.opensymphony.xwork2.UnknownHandler" name="handler" class="com.test.PageNotFoundAction"/>

 

Notas

  • He estado buscando una manera más elegante para devolver un status 404 con Struts 2. Si lo encuentras dímelo.