Struts 2 Hello World Program
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Struts »
On Oct 22, 2011 | { 9 Comments }
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Let us see the Hello World program of struts 2, files required..
- success.jsp
- error.jsp
- index.jsp
- LogingEx.java [ in java4s package ]
- web.xml [ in web-inf ]
- struts.xml [ in web-inf/classes folder ]
Directory Structure
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index.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> <html> <body> <s:form action="verify"> <s:textfield name="uname" label="Enter Username" /><br> <s:submit value="Click" align="center" /> </s:form> </body> </html>
success.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> You have been successfully executed struts 2 hello world program..
error.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> Login failed, wrong user name, user name must be java4s
LogingEx.java
package java4s;
import com.opensymphony.xwork2.ActionSupport;
public class LogingEx extends ActionSupport{
private static final long serialVersionUID = 1L;
private String uname;
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String execute()
{
if(uname.equals("java4s"))
{
return SUCCESS;
}else
return ERROR;
}
}
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"> <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>index.jsp</welcome-file> </welcome-file-list> </web-app>
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>
<include file="struts-default.xml"/>
<package name="a" extends="struts-default">
<action name="verify" class="java4s.LogingEx">
<result name="success">/success.jsp</result>
<result name="error">/error.jsp</result>
</action>
</package>
</struts>
Execution Flow
- Right click on the project root > Run As > Run on Server
- index.jsp will be executed automatically, because we have given index.jsp in <welcome-file></welcome-file> of web.xml file
- Enter username as java4s and press ‘click‘ button
- In index.jsp we have given form action as verify [ line number 5 ], so container come to web.xml and check for URL pattern and jumps to struts.xml
- Now it will search for action name ‘verify‘, if found then corresponding java file given in class attribute will be executed [line number 10 ]
- Now execute() method will be executed in LogingEx.java, if condition is satisfied it will returns SUCCESS
- Again come to struts.xml line number 11, corresponding view will be executed
- That’s it.
After Execution
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Output
Enter java4s as user name and press click button
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What you are thinkig....
9 Responses to “Struts 2 Hello World Program”
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Please post your questions on Java4s Answers forum
Will you please explain different tags and uses of them in Struts.xml file. Explain tags like Constant tag and package tag in Struts.
I am ramu:
please will you explain this example.
i cont understand this example.
Hi author, thanks for the code. I now have a question, it seems like I have to add a /input.jsp to the
for the program to run, and no matter what I input as the username, the program will always get redirected to input.jsp. Could you please advise? Thanks in advance!
I am trying to execute this application with struts 2.3.8 jar files in glassfish 3.1.2.
When I load the index.jsp after deploying, I’m getting a warning message in the log
org.apache.struts2.components.ServletUrlRenderer|_ThreadID=91;_ThreadName=Thread-2;|No configuration found for the specified action: ‘verify’ in namespace: ”. Form action defaulting to ‘action’ attribute’s literal value.|#]
Just followed the directory and xml structure as mentioned in the example.
How to proceed further by solving this error?
@Ramu
Execution flow is added, please go through that.
It should clarify your doubt
I am getting “HTTP Status 404″ when used the above code in the provided way.Could you please guide on it?
Hi Siva,
I some books action class does not extend the ActionSupport class. Please explain is it necessary to extend ActionSupport or not.
Hi Nishant,
As Action Support Class implements Action,Validetable,Validation aware,text provider,Locale provider & Serilizable interface by default, so in our Action class by Default we will get the Advantages(Methods, Constants …etc ) in our class. It Makes our Design Robust.
Thanks
excellent answer good web site i gave 100 marks for clear explanation
so please help me for more answers for my request…..
thanking you,
venkatesh.j