Struts Framework

Access URL Parameters in Action Class in Struts 2

Create Maven Project

On the Eclipse, create a Maven project

Click Next button and select Workspace location for project

Click Next button and select maven-archetype-webapp

Click Next button and enter Project Information:

  • GroupId: LearnStrutsFrameworkWithRealApps
  • Artifact Id: LearnStrutsFrameworkWithRealApps
  • Package: com.demo

Click Finish button to finish create Maven project




Add Tomcat Server

Select current project, Right click and select Properties menu. In Properties dialog, select Targeted Runtime in left side after select Tomcat server from server list in right side

Click Ok button to finish

Add JRE System Library

Select current project, Right click and select Build Path\Configure Build Path menu Select JRE System Library in Libraries tab:

Click Edit button and select JRE System Library you need use as below:

Click Finish button to finish

Configure pom.xml

Open pom.xml file and add configurations for Struts 2 as below:

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>LearnStrutsFrameworkWithRealApps</groupId>
	<artifactId>LearnStrutsFrameworkWithRealApps</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>LearnStrutsFrameworkWithRealApps Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<dependencies>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>javax.servlet.jsp.jstl-api</artifactId>
			<version>1.2.1</version>
		</dependency>

		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
			<scope>provided</scope>
		</dependency>

		<!-- Struts 2 Framework -->

		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.5.20</version>
		</dependency>

		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-convention-plugin</artifactId>
			<version>2.5.20</version>
		</dependency>

	</dependencies>

	<build>
		<finalName>LearnStrutsFrameworkWithRealApps</finalName>
	</build>

</project>




Configure web.xml

Open web.xml file in src\main\webapp\WEB-INF folder and add configurations for Struts 2 as below:

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
		 http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	version="3.1">

	<display-name>Learn Struts 2 Framework with Real Apps</display-name>

	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
		<init-param>
			<param-name>struts.devMode</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>struts.action.extension</param-name>
			<param-value>html</param-value>
		</init-param>
	</filter>

	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
		<dispatcher>REQUEST</dispatcher>
		<dispatcher>FORWARD</dispatcher>
		<dispatcher>INCLUDE</dispatcher>
	</filter-mapping>

	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

</web-app>

Create Demo Action

Create new package named controllers.action in src/main/java folder. The action class in Struts 2 must be put in a package named action. In this package, create new java class named DemoAction.java as below: 

package controllers.action;

import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.Result;

import com.opensymphony.xwork2.ActionSupport;

@Namespace("/demo")
public class DemoAction extends ActionSupport {

	private static final long serialVersionUID = 1L;

	private String id1;
	private int id2;
	private String id3;

	public String getId1() {
		return id1;
	}

	public void setId1(String id1) {
		this.id1 = id1;
	}

	public int getId2() {
		return id2;
	}

	public void setId2(int id2) {
		this.id2 = id2;
	}

	public String getId3() {
		return id3;
	}

	public void setId3(String id3) {
		this.id3 = id3;
	}

	@Action(value = "demo1", results = {
		@Result(name = SUCCESS, location = "/WEB-INF/views/demo/demo1.jsp")
	})
	public String demo1() {
		/* Print id1 to console */
		System.out.println("id1: " + this.id1);
		return SUCCESS;
	}

	@Action(value = "demo2", results = {
		@Result(name = SUCCESS, location = "/WEB-INF/views/demo/demo2.jsp")
	})
	public String demo2() {
		/* Print id2 and id3 to console */
		System.out.println("id2: " + this.id2);
		System.out.println("id3: " + this.id3);
		return SUCCESS;
	}

}




Create Views

Create new folder named views in src\main\webapp\WEB-INF folder. In views folder, create new folder named demo. In demo folder create new views as below:

Index View

In demo folder create new JSP file named index.jsp as below: 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1" isELIgnored="false"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Learn Struts 2 with Real Apps</title>
</head>
<body>

	<h3>Use Query String</h3>
	<s:url var="demo1_url" namespace="/demo" action="demo1">
		<s:param name="id1">p01</s:param>
	</s:url>
	<s:a href="%{demo1_url}">Demo 1</s:a> |
	<s:url var="demo2_url" namespace="/demo" action="demo2">
		<s:param name="id2">123</s:param>
		<s:param name="id3">p02</s:param>
	</s:url>
	<s:a href="%{demo2_url}">Demo 2</s:a>

</body>
</html>

Demo 1 View

In demo folder, create new JSP file named demo1.jsp as below: 

	<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1" isELIgnored="false"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Learn Struts 2 with Real Apps</title>
</head>
<body>

	<h3>Demo 1 Page</h3>
	Id1: ${id1 }

</body>
</html>




Demo2 View

In demo folder, create new JSP file named demo2.jsp as below: 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1" isELIgnored="false"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Learn Struts 2 with Real Apps</title>
</head>
<body>

	<h3>Demo 2 Page</h3>
	Id2: ${id2 }
	<br>
	Id3: ${id3 }

</body>
</html>

Create Redirect Page

Create new jsp file named index.jsp in src\main\webapp folder as below: 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<jsp:forward page="demo/demo1.html"></jsp:forward>

Structure of Project




Run Application

Select project, right click and select Run on Server menu

Access demo1 method in demo action with following url:

http://localhost:8080/LearnStrutsFrameworkWithRealApps/demo/demo1.html

Output

Click Demo 1 link:

Output

Click Demo 2 link:

Output

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