Hello Im doing the convention plugin for struts2.2.1, examples with netbeans6.9
and it seems like something is wrong. I even copy/paste everything and nothing. rightnow I get :
"The error message is ${message} "
when it should be
"The error message is Hello World"
i could not post the structure, but I put the jsp under the WEB-INF following the tutorial
but nothing
web.xml
<web-app>
<display-name>My Application</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>hello-world.jsp</welcome-file>
</welcome-file-list>
myaction:
package com.example.actions;
import com.opensymphony.xwork2.ActionSupport;
public class HelloWorld extends ActionSupport {
private String message;
public String getMessage() {
return message;
}
public String execute() {
if (System.currentTimeMillis() % 2 == 0) {
message = "It's 0";
return "zero";
}
message = "It's 1";
return SUCCESS;
}
}
hello-world.jsp
<html>
<body>
The Error message is ${message}
</body>
</html>
I don´t think I need a strut.xml file. I´m really getting frustrated here
would really appreciate any help or can´t you do annotations with struts2.2.1 ?
The way you have your welcome-file in web.xml it would only display "The Error message is".
You need to go straight to the action, so that you get an initial value. You need an additional index.html like this one:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Dummy Project</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<META HTTP-EQUIV="Refresh" CONTENT="0;URL=hello.action">
</head>
<body>
<p>Project is Loading ...</p>
</body>
</html>
Index.html should be your welcome-file in your web.xml. Your struts.xml is here:
<struts>
<constant name="struts.devMode" value="true"/>
<include file="struts-default.xml"/>
<package name="foo" extends="struts-default">
<action name="hello" class="com.example.action.HelloWorld">
<result name="success">/hello-world.jsp</result>
</action>
</package>
</struts>
"hello" is your action. Only a "success" result is necessary here. After the action runs, you will be redirected to your hello-world.jsp:
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%#taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
The Error message is ${message}
</body>
</html>
Here is your HelloWorld.java. Execute() returns only SUCCESS. This should be sufficient.
package com.example.action;
import com.opensymphony.xwork2.ActionSupport;
public class HelloWorld extends ActionSupport {
private String message;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public HelloWorld() {
}
#Override
public String execute() {
if (System.currentTimeMillis() % 2 == 0)
message = "It's 0";
else
message = "It's 1";
return SUCCESS;
}
}
You can certainly do the same with annotations. It should be easy to make this work.
I use this NetBeans Struts2 Support plugin. Enjoy...
Costis
Related
I am new to Struts 2 framework. I have made a program for understanding modelDriven interceptor. But I am unable to execute it. Following are the list of files and in the end there is a output (error).
index.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%-- <jsp:useBean id="ent" class="pack.Entity" scope="session" /> --%>
<s:form method="get" action="go">
<s:textfield name="t1" label="Name"></s:textfield>
<s:password name="p1" label="Password"></s:password>
<s:submit value="accept"></s:submit>
</s:form>
</body>
</html>
Entity.java:
package actions_pack;
public class Entity {
private String t1;
private String p1;
public String getP1() {
return p1;
}
public void setP1(String p1) {
this.p1 = p1;
}
public Entity() {
super();
// TODO Auto-generated constructor stub
}
public String getT1() {
return t1;
}
public void setT1(String t1) {
this.t1 = t1;
}
}
GoAction.java:
package actions_pack;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor;
import com.opensymphony.xwork2.util.ValueStack;
public class GoAction implements ModelDriven<Entity> {
private Entity en;
public Entity getEn() {
return en;
}
public void setEn(Entity en) {
this.en = en;
}
public String execute(){
System.out.println("inside action");
if(en.getT1().equalsIgnoreCase("nitin")){
return "success";
}
else{
return "failure";
}
}
#Override
public Entity getModel() {
System.out.println("inside model driven....");
en=new Entity();
return en;
}
}
struts.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="dd">
<result-types>
<result-type name="dispatcher"
class="org.apache.struts2.dispatcher.ServletDispatcherResult"
default="true" />
</result-types>
<interceptors>
<interceptor name="modelDriven" class="com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor"/>
<interceptor-stack name="myStack">
<interceptor-ref name="modelDriven"></interceptor-ref>
</interceptor-stack>
</interceptors>
<action name="go" class="actions_pack.GoAction">
<interceptor-ref name="myStack"></interceptor-ref>
<result name="success" type="dispatcher" >/one/welcome.jsp</result>
<result name="failure" type="dispatcher">/one/error.jsp</result>
</action>
</package>
</struts>
welcome.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Welcome, <s:property value="t1"/>
</body>
</html>
web-page output(500 error):
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
actions_pack.GoAction.execute(GoAction.java:24)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.34 logs.
Apache Tomcat/7.0.34
In struts.xml file I don't want to use/extend struts-default package. Although, when I include params interceptor entry along with modelDriven interceptor in struts.xml, problem solves. What is the reason behind this. Can any one guide me?
You have a property in the action class that needs initialize prior to the action execution. You can do it in many ways.
The way you have chosen relies on modelDriven interceptor which is running before your action is executed. It invokes getModel() to push it on top of the valueStack. So, your entity property is being initialized. If you remove this interceptor you will get NullPointerException when the action is executed.
If your Entity is a simple POJO that you can instantiate yourself then simply do it inline instead of in getModel().
private Entity en = new Entity();
#Override
public Entity getModel() {
System.out.println("inside model driven....");
return en;
}
Next part is about params interceptor. It uses OGNL to populate a top object that is a model if you have used modelDriven interceptor prior params interceptor.
Living it along with your action allows to initialize some properties you reference in the execute().
For example t1 should be initialized.
I have a requirement where passing parameters from one action to another action with No sessions using: Here is my code, I am trying to use scope-interceptor.
here is my code I am not sure what am I doing wrong but I am not able to get the results.
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="HelloWorld" class="com.tutorials4u.helloworld.HelloWorld">
<result name="SUCCESS">/success.jsp</result>
</action>
<action name="FirstAction" class="com.tutorials4u.helloworld.FirstAction">
<interceptor-ref name="basicStack" />
<interceptor-ref name="scope">
<param name="session">myName</param>
<param name="key">person</param>
<param name="type">start</param>
</interceptor-ref>
<result name="SUCCESS">/success1.jsp</result>
</action>
<action name="SecondAction" class="com.tutorials4u.helloworld.SecondAction">
<interceptor-ref name="scope">
<param name="session">myName</param>
<param name="key">person</param>
</interceptor-ref>
<interceptor-ref name="basicStack" />
<result name="SUCCESS">/success2.jsp</result>
</action>
</package>
</struts>
*index.jsp*
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%#taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello World</title>
</head>
<body>
<s:form action="HelloWorld" >
<s:textfield name="userName" label="User Name" />
<s:submit />
</s:form>
</body>
</html>
*Success.jsp*
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%#taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello World</title>
</head>
<body>
<s:property value="person.myName"></s:property>
<s:form action="FirstAction" >
<s:submit value="Click for first Action"></s:submit>
</s:form>
</body>
</html>
*success1.jsp*
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%#taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello World</title>
</head>
<body>
<s:property value="person.myName"></s:property>
<h1><s:property value="message" /></h1>I am in FIRST ACTION
<s:form action="SecondAction">
<s:submit value="click for 2nd action"></s:submit></s:form>
</body>
</html>
*success2.jsp*
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%#taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello World</title>
</head>
<body>
<h1><s:property value="message" /></h1>2ND ACTION EXECUTED
<s:property value="person.myName"></s:property>
</body>
</html>
**ACTIONS**
package com.tutorials4u.helloworld;
import com.opensymphony.xwork2.ActionSupport;
/**
*
*
*/
public class HelloWorld extends ActionSupport{
private static final long serialVersionUID = 1L;
private String message;
private String userName;
public HelloWorld() {
}
public String execute() {
setMessage("Hello " + getUserName());
return "SUCCESS";
}
/**
* #return the message
*/
public String getMessage() {
return message;
}
/**
* #param message the message to set
*/
public void setMessage(String message) {
this.message = message;
}
/**
* #return the userName
*/
public String getUserName() {
return userName;
}
/**
* #param userName the userName to set
*/
public void setUserName(String userName) {
this.userName = userName;
}
}
*FirstAction.java*
package com.tutorials4u.helloworld;
import com.opensymphony.xwork2.ActionSupport;
public class FirstAction extends ActionSupport {
/**
*
*/
private String myString;
private Person person;
private static final long serialVersionUID = 1L;
public FirstAction(){
}
public String execute() {
return "SUCCESS";
}
public String getMyString() {
return myString;
}
public void setMyString(String myString1) {
this.myString = myString1;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
package com.tutorials4u.helloworld;
public class Person {
private String myName;
public String getMyName() {
return myName;
}
public void setMyName(String myName1) {
myName1 = "test string";
this.myName = myName1;
}
}
SecondAction.java
package com.tutorials4u.helloworld;
import com.opensymphony.xwork2.ActionSupport;
public class SecondAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private Person person;
public SecondAction(){
}
public String execute() {
return "SUCCESS";
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
---I would really appreciate if you can help me on where I was doing things wrong..
TIA
so we are instantiating session object in each and every other action
right?
Not at all, we are just retrieving it from the ServletActionContext.
How to put in session
ServletActionContext.getContext().getSession().put("softuser", someUserObject);
How to retrieve from session
ServletActionContext.getContext().getSession().get("softuser");
I am working on struts 2.0 using annotations and created a web project in which I am just doing a login and redirecting on successful login to another jsp. However, whenever i try to login, it shows me an error message :-
There is no Action mapped for namespace [/] and action name [welcome] associated with context path [/strutsDemo2].
I have added the following jar files into my project:
asm-3.3.jar
asm-all-2.2.3.jar
cglib-nodep-2.2.3.jar
commons-fileupload-1.3.jar
commons-io-2.0.1.jar
commons-lang3-3.1.jar
freemarker-2.3.19.jar
javassist-3.11.0.GA.jar
ognl-3.0.6.jar
struts2-convention-plugin-2.3.15.1.jar
struts2-core-2.3.15.1.jar
xwork-core-2.3.15.1.jar
My jsp is:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%#taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Demo</title>
</head>
<body>
<s:form action="welcome" validate="true">
<s:textfield name="userName" label="userName"></s:textfield>
<s:submit value="submit"></s:submit>
</s:form>
</body>
</html>
and my action class is:
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.ResultPath;
import org.apache.struts2.convention.annotation.Results;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator;
import com.opensymphony.xwork2.validator.annotations.ValidatorType;
#Namespace("/")
#ResultPath("/")
#Results({
#Result(name="success", location="/Welcome.jsp"),
#Result(name="input", location="/index.jsp")
})
public class Welcome extends ActionSupport{
private String userName;
private String message;
#RequiredStringValidator(type=ValidatorType.FIELD, message="Name is Required")
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
#Action(value="welcome")
public String execute()
{
return SUCCESS;
}
}
Web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>strutsDemo2</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
<init-param>
<param-name>struts.devMode</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
Please change your <s:form action="welcome" validate="true"> to <s:form action="Welcome" validate="true">.
In action attribute of tag use "Welcome" instead of "welcome". Upper case of "W"
I am new to Struts 2 and trying to see whether I can populate a drop down box with the list of values but still I am not able to get it working.
Following is my Action class (Portal.java):
public class Portal extends ActionSupport {
private Map Products;
private String product;
public Portal(){
Products = new HashMap();
Products.put("1", "Java");
Products.put("2", "C++");
}
public Map getProducts() {
return Products;
}
public void setProducts(Map Products) {
this.Products = Products;
}
public String getProduct() {
return product;
}
public void setProduct(String product) {
this.product = product;
}
public String execute() {
return SUCCESS;
}
}
Following is my Portal.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Portal</title>
</head>
<body>
<h2>Portal</h2>
<s:form action="result" namespace="/">
<h4>
<s:select label="Select Product"
name="product"
headerKey="-1"
headerValue="Select Product"
list="Products"
/>
</h4>
<h4>
<s:submit label="Submit" name="submitButton" align="center" />
</h4>
</s:form>
Following is my result.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org
/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Results Page</title>
</head>
<body>
<h1>Portal</h1>
<h4>
Selected Product : <s:property value="product"/>
</h4>
</body>
</html>
Following is my struts.xml:
<?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>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<constant name="struts.ognl.allowStaticMethodAccess" value="false" />
<package name="default" extends="struts-default" namespace="/">
<action name="result" class="com.abc.xyz.Portal">
<result name="error">Portal.jsp</result>
<result name="success">Result.jsp</result>
</action>
</package>
</struts>
Following is my web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee
/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Portal</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>Portal.jsp</welcome-file>
</welcome-file-list>
</web-app>
When I execute this on Tomcat 6 server, I get following error:
SEVERE: Servlet.service() for servlet jsp threw exception
tag 'select', field 'list', name 'product': The requested list key 'Products' could
not be resolved as a collection/array/map/enumeration/iterator type. Example:
people or people.{name} - [unknown location]
But when I replace list="Products" with list="#{'1':'Java', '2':'C++'}", then it works perfectly fine .. I don't know what am I missing so that the list is not being shown.
Please help.
Memory is not allocated for Map Products.
Just before setting the values for the Products write -
Products = new Map();
then set the values to the map. This will help to populate the values of the Products on the View.
Java is case sensitive... list="products" is what you want not list="Products"
Edit: see the comments under this question, you should have a getter or change the access to Products to public.
According to Struts2 data prepopulation should be done by PreparableInterceptor and you have to override prepare method.
public void prepare() throws Exception {
Products = new HashMap();
Products.put("1", "C#");
Products.put("2", "Java");
}
Actually when you open your Portal.jsp it look on valuestack but it didn't get that's why this error come.Because on load the corresponding action is not calling,you have to call action onload.Implement Preparable interface and override the prepare method and in that method you write your code.``
Refer my answer to this similar question: Struts2 list couldn't be resolved
For additional details refer:
https://struts.apache.org/docs/message-resource-files.html
I am trying to write small login application in struts 2.Session is b eing created successfully.In welcome.jsp "logout" option is given.On logout control will be redirected to Logout.jsp.
My problem is after logout session variables are destroyed but pages are storing in browser cache.If click back button of browser i am able to see welcome.jsp.
For clearing cache "ClearCacheInterceptor" is used.I don't understand where i am making mistake.
Instead of clearing browser every time is there any to overcome this prooblem ? Is my approach correct ? Please suggest me.
Login.jsp
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%#taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login</title>
</head>
<body>
<s:form action="login">
<s:textfield name="myname"></s:textfield>
<s:submit value="submit"></s:submit>
</s:form>
</body>
</html>
Struts.xml
<interceptors>
<interceptor name="clear-cache" class="ActionClasses.ClearCacheInterceptor" />
</interceptors>
<action name="login" class="ActionClasses.LoginAction" >
<interceptor-ref name="clear-cache" />
<result name="success">Welcome.jsp</result>
<result name="error">Login.jsp</result>
</action>
<action name="logout" class="ActionClasses.Logout">
<interceptor-ref name="clear-cache" />
<result name="success">Logout.jsp</result>
</action>
LoginAction.java
package ActionClasses;
import java.util.Map;
import org.apache.struts2.interceptor.SessionAware;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.validator.annotations.RequiredFieldValidator;
import com.opensymphony.xwork2.validator.annotations.ValidatorType;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class LoginAction extends ActionSupport implements SessionAware
{
/**
*
*/
private static final long serialVersionUID = 1L;
private String myname;
private Map<String , Object> s;
public String execute()throws Exception
{
s=ActionContext.getContext().getSession();
s.put("login", myname);
return "success";
}
public void setMyname(String s)
{
myname=s;
}
public String getMyname()
{
return myname;
}
#Override
public void setSession(Map<String, Object> arg0) {
// TODO Auto-generated method stub
s=arg0;
}
}
ClearcacheInterceptor.java
package ActionClasses;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.StrutsStatics;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class ClearCacheInterceptor extends AbstractInterceptor{
/**
*
*/
private static final long serialVersionUID = 1L;
#Override
public String intercept(ActionInvocation invocation) throws Exception {
ActionContext context=(ActionContext)invocation.getInvocationContext();
HttpServletResponse response=(HttpServletResponse)context.get(StrutsStatics.HTTP_RESPONSE);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
String result=invocation.invoke();
System.out.println("check result="+result);
return result;
}
}
Logout.java
package ActionClasses;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class Logout extends ActionSupport {
public String execute(){
Map<String,Object> s=ActionContext.getContext().getSession();
s.remove("login");
ActionContext.getContext().getSession().clear();
return "success";
}
}
Welcome.jsp
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%# page contentType="text/html; charset=UTF-8"%>
<%# taglib prefix="s" uri="/struts-tags"%>
<s:include value="CheckLogin.jsp"></s:include>
<%# taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
</head>
<body>
<font color="white"></font>
Welcome<s:property value="#session['login']"/>
<s:a href="logout">Logout</s:a>
</body>
</html>
Logout.jsp
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%# taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
log out successful !!
</body>
</html>
CheckLogin.jsp
<%# taglib prefix="s" uri="/struts-tags" %>
<%# page language="java" contentType="text/html" import="java.util.*"%>
<html>
<head>
<title>Check validate!</title>
</head>
<body>
This is session validation page!
<s:if test="#session.login != 'Jagan'">
<jsp:forward page="Login.jsp" />
</s:if>
</body>
</html>
Well that's a very common issue and this is with respect to your browser cache issue rather than struts2 or any other framework at all.
we have face same problem since when you hit the back button of browser the request is not being send to the server rather it is being serves from the browser cache.you will only notice things when you try to do some work and it will come up with error that you are no longer being logged in.
though you can use certain header like no-cache etc but they are being obeyed by the browser is not certain.
only workaround to this problem as per my understanding is to use https (secure browsing) for your work and than use the header (no-cache. cache-expiry etc) since when you browse application under secure mode these header will be followed by the server and browser.
i hope this will try to give you an idea, just to check redirect to https protocol when your logout and it will solve your problem